[Event "DDR-Cup corr"]
[Site "DDR"]
[Date "1986.??.??"]
[Round "?"]
[White "Unterdoerfer, Edgar"]
[Black "Hoppner"]
[Result "0-1"]
[ECO "C18"]
[PlyCount "72"]
[EventDate "1986.??.??"]
[EventType "tourn (corr)"]
[EventRounds "10"]
[EventCountry "DDR"]
[SourceTitle "Corr Nr. 1"]
[Source "ChessBase"]
[SourceDate "1997.09.01"]
[SourceVersion "2"]
[SourceVersionDate "2000.04.19"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. Nc3 Bb4 4. e5 c5 5. a3 Bxc3+ 6. bxc3 Ne7 7. Qg4 Qc7 8. Qxg7 Rg8 9. Qxh7 cxd4 10. Ne2 Nbc6 11. f4 Bd7 12. Qd3 dxc3 13. Nxc3 a6 14. Rb1 Na5 15. h4 Nf5 16. Rh3 0-0-0 17. h5 Nc4 18. Rb4 Bc6 19. Ne2 Bb5 20. Qf3 Qc5 21. g4 Ne7 22. h6 d4 23. h7 Rh8 24. Ng3 Ne3 25. Ne4 Qxc2 26. Bxe3 dxe3 27. Bxb5 axb5 28. Nd6+ Rxd6 29. exd6 Nd5 30. Re4 Qc1+ 31. Qd1 Qxd1+ 32. Kxd1 Nc3+ 33. Kc2 Nxe4 34. Rxe3 Nf6 35. Rc3+ Kd8 36. g5 Nd5 0-1

[Event "DDR-Cup corr"]
[Site "DDR"]
[Date "1985.??.??"]
[Round "?"]
[White "De Kort, JP."]
[Black "Unterdoerfer, Edgar"]
[Result "1/2-1/2"]
[ECO "B25"]
[PlyCount "62"]
[EventDate "1985.??.??"]
[EventType "tourn (corr)"]
[EventRounds "10"]
[EventCountry "DDR"]
[SourceTitle "Corr Nr. 1"]
[Source "ChessBase"]
[SourceDate "1997.09.01"]
[SourceVersion "2"]
[SourceVersionDate "2000.04.19"]
[SourceQuality "1"]

1. e4 c5 2. Nc3 Nc6 3. g3 g6 4. Bg2 Bg7 5. d3 d6 6. f4 e5 7. Nh3 Nge7 8. 0-0 Nd4 9. Nd5 h6 10. c3 Ndc6 11. fxe5 Nxd5 12. exd5 Nxe5 13. Nf2 0-0 14. Be3 b6 15. Qd2 Kh7 16. Rae1 Bd7 17. Ne4 Bb5 18. c4 Bxc4 19. Bg5 hxg5 20. Nxg5+ Kg8 21. dxc4 Bh6 22. Rxe5 dxe5 23. h4 Qd6 24. Qf2 Bxg5 25. hxg5 Kg7 26. Qf6+ Qxf6 27. Rxf6 Rh8 28. d6 Rad8 29. Bd5 Rd7 30. Bc6 Rdd8 31. Bd5 Rd7 1/2-1/2

[Event "DDR-ch M793 corr"]
[Site "DDR"]
[Date "1985.??.??"]
[Round "?"]
[White "Dittmar, Olaf"]
[Black "Unterdoerfer, Edgar"]
[Result "1-0"]
[ECO "B31"]
[PlyCount "73"]
[EventDate "1985.05.??"]
[EventType "tourn (corr)"]
[EventRounds "7"]
[EventCountry "DDR"]
[SourceTitle "Corr 2002"]
[Source "ChessBase"]
[SourceDate "2002.05.23"]
[SourceVersion "1"]
[SourceVersionDate "2002.05.23"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 Nc6 3. Bb5 g6 4. 0-0 Bg7 5. c3 Nf6 6. Re1 0-0 7. d4 cxd4 8. cxd4 d5 9. e5 Ne4 10. Nc3 Nxc3 11. bxc3 Qa5 12. a4 Bg4 13. Re3 Rac8 14. h3 Bd7 15. Bd2 Qc7 16. Ne1 Na5 17. Nd3 b6 18. Nf4 Nc4 19. Nxd5 Nxe3 20. Nxe7+ Kh8 21. Bxe3 Rce8 22. Nd5 Qb7 23. c4 f6 24. exf6 Bxf6 25. Nxf6 Rxf6 26. d5 Kg8 27. Qd4 Ref8 28. c5 bxc5 29. Qxc5 a6 30. Bc4 Rc8 31. d6+ Be6 32. Qe5 Bxc4 33. Qxf6 Rf8 34. Qe5 Qg7 35. Qxg7+ Kxg7 36. Rc1 Bb3 37. Bg5 1-0

[Event "DDR-ch M793 corr"]
[Site "DDR"]
[Date "1985.??.??"]
[Round "?"]
[White "Puls, Georg"]
[Black "Unterdoerfer, Edgar"]
[Result "1/2-1/2"]
[ECO "B33"]
[PlyCount "50"]
[EventDate "1985.05.??"]
[EventType "tourn (corr)"]
[EventRounds "7"]
[EventCountry "DDR"]
[SourceTitle "Corr 2002"]
[Source "ChessBase"]
[SourceDate "2002.05.23"]
[SourceVersion "1"]
[SourceVersionDate "2002.05.23"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 e5 6. Ndb5 d6 7. Bg5 a6 8. Na3 b5 9. Nd5 Qa5+ 10. Bd2 Qd8 11. Nxf6+ Qxf6 12. c4 Qg6 13. f3 Be7 14. cxb5 Bh4+ 15. g3 Bxg3+ 16. hxg3 Qxg3+ 17. Ke2 Nd4+ 18. Ke3 f5 19. Bc3 fxe4 20. Bxd4 exd4+ 21. Kxd4 Qe5+ 22. Ke3 exf3+ 23. Kf2 Qc5+ 24. Kg3 Qg5+ 25. Kf2 Qc5+ 1/2-1/2

[Event "DDR-ch M793 corr"]
[Site "DDR"]
[Date "1985.??.??"]
[Round "?"]
[White "Schmidt, Eckhard"]
[Black "Unterdoerfer, Edgar"]
[Result "1-0"]
[ECO "B31"]
[PlyCount "53"]
[EventDate "1985.05.??"]
[EventType "tourn (corr)"]
[EventRounds "7"]
[EventCountry "DDR"]
[SourceTitle "Corr 2002"]
[Source "ChessBase"]
[SourceDate "2002.05.23"]
[SourceVersion "1"]
[SourceVersionDate "2002.05.23"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 Nc6 3. Bb5 g6 4. c3 Nf6 5. Qe2 Bg7 6. 0-0 0-0 7. e5 Ne8 8. d4 Nc7 9. Bxc6 bxc6 10. dxc5 Ba6 11. c4 d5 12. cxd6 exd6 13. b3 dxe5 14. Bb2 f6 15. Nbd2 Qe7 16. Qe4 Qe6 17. Rfe1 Rfe8 18. Rad1 Rad8 19. Qe3 Ra8 20. Ne4 Qc8 21. Nd6 Qe6 22. Nxe8 Nxe8 23. Ba3 Qf7 24. Qc5 Bb7 25. Qe7 Qxe7 26. Bxe7 Kf7 27. Bc5 1-0

[Event "DDR-ch M793 corr"]
[Site "DDR"]
[Date "1985.??.??"]
[Round "?"]
[White "Unterdoerfer, Edgar"]
[Black "Haupold, Erhard"]
[Result "1-0"]
[ECO "B15"]
[PlyCount "125"]
[EventDate "1985.05.??"]
[EventType "tourn (corr)"]
[EventRounds "7"]
[EventCountry "DDR"]
[SourceTitle "Corr 2002"]
[Source "ChessBase"]
[SourceDate "2002.05.23"]
[SourceVersion "1"]
[SourceVersionDate "2002.05.23"]
[SourceQuality "1"]

1. e4 c6 2. d4 d5 3. Nc3 dxe4 4. Nxe4 Nf6 5. Nxf6+ exf6 6. Bc4 Qe7+ 7. Qe2 Be6 8. Bb3 Na6 9. Be3 Bxb3 10. axb3 Qe6 11. Nf3 Bd6 12. 0-0 0-0 13. Rfe1 Rfe8 14. Qd2 Qd7 15. c3 Nc7 16. Bf4 Re6 17. Bxd6 Qxd6 18. Qc2 Qe7 19. Kf1 Nd5 20. Nd2 b6 21. Re4 Re8 22. Rae1 Qc7 23. Nf3 f5 24. Re5 g6 25. Qd2 Qd6 26. h3 Kg7 27. g3 h6 28. b4 f6 29. Rxe6 Rxe6 30. Rxe6 Qxe6 31. Qe2 Qe4 32. Qxe4 fxe4 33. Nd2 f5 34. Nc4 g5 35. Ne5 Ne7 36. f3 exf3 37. Kf2 Kf6 38. Kxf3 Ke6 39. c4 h5 40. h4 gxh4 41. gxh4 b5 42. Nxc6 bxc4 43. Nxa7 Ng6 44. Kg3 Ne7 45. b5 Nd5 46. Nc6 f4+ 47. Kf3 Kf5 48. Na5 Nb6 49. Nb7 Nc8 50. Nc5 Nb6 51. Ne4 Nd5 52. Nd6+ Ke6 53. Nxc4 Kd7 54. Ke4 Nc7 55. b6 Nb5 56. d5 f3 57. Kxf3 Nd4+ 58. Kf4 Ne2+ 59. Kg5 Ng3 60. d6 Kc6 61. b3 Kb7 62. d7 Ne4+ 63. Kg6 1-0

[Event "DDR-ch M793 corr"]
[Site "DDR"]
[Date "1985.??.??"]
[Round "?"]
[White "Unterdoerfer, Edgar"]
[Black "Hirt, Rudi"]
[Result "1-0"]
[ECO "C10"]
[PlyCount "119"]
[EventDate "1985.05.??"]
[EventType "tourn (corr)"]
[EventRounds "7"]
[EventCountry "DDR"]
[SourceTitle "Corr 2002"]
[Source "ChessBase"]
[SourceDate "2002.05.23"]
[SourceVersion "1"]
[SourceVersionDate "2002.05.23"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. Nd2 dxe4 4. Nxe4 Nf6 5. Nxf6+ Qxf6 6. Nf3 Bd6 7. Bg5 Qf5 8. Qd2 h6 9. Be3 Nc6 10. Bd3 Qf6 11. 0-0 0-0 12. c4 Be7 13. a3 Rd8 14. b4 a6 15. Rfe1 e5 16. d5 Bg4 17. Be4 Bxf3 18. Bxf3 Nd4 19. Bxd4 exd4 20. Rad1 a5 21. c5 axb4 22. axb4 Rab8 23. Re4 b6 24. Rde1 Qg5 25. Qd3 Qg6 26. d6 cxd6 27. c6 d5 28. Rxd4 Qxd3 29. Rxd3 Bxb4 30. Red1 Bd6 31. Rxd5 Bc7 32. Rd7 Rbc8 33. Be2 Rxd7 34. cxd7 Rd8 35. Bb5 Kf8 36. Re1 g6 37. Re8+ Kg7 38. Kf1 f5 39. Ke2 g5 40. Kd3 h5 41. Kd4 h4 42. f3 g4 43. Kd5 gxf3 44. gxf3 Kf7 45. Kc6 Rxd7 46. Kxd7 Bxh2 47. Bd3 Kg7 48. Bxf5 Kf6 49. Bg4 Bg1 50. Kd6 Kf7 51. Re4 Bh2+ 52. Kc6 Bg1 53. Bh5+ Kf6 54. Rxh4 Ke5 55. Rh1 Bf2 56. Rb1 Ke6 57. Rxb6 Bxb6 58. Kxb6 Kd6 59. f4 Ke6 60. Bg4+ 1-0

[Event "DDR-ch M793 corr"]
[Site "DDR"]
[Date "1985.??.??"]
[Round "?"]
[White "Unterdoerfer, Edgar"]
[Black "Wolf, Wolfgang"]
[Result "0-1"]
[ECO "C98"]
[PlyCount "92"]
[EventDate "1985.05.??"]
[EventType "tourn (corr)"]
[EventRounds "7"]
[EventCountry "DDR"]
[SourceTitle "Corr 2002"]
[Source "ChessBase"]
[SourceDate "2002.05.23"]
[SourceVersion "1"]
[SourceVersionDate "2002.05.23"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. 0-0 Be7 6. Re1 b5 7. Bb3 d6 8. c3 0-0 9. h3 Na5 10. Bc2 c5 11. d4 Qc7 12. Nbd2 Nc6 13. dxc5 dxc5 14. Nf1 Be6 15. Ne3 Rad8 16. Qe2 c4 17. Nf5 Rfe8 18. Bg5 Nd7 19. Nxe7+ Nxe7 20. a4 f6 21. Be3 Nc5 22. axb5 axb5 23. Bxc5 Qxc5 24. Qe3 Qxe3 25. Rxe3 Ra8 26. Ree1 Nc6 27. Red1 Kf7 28. Kf1 Red8 29. Rdb1 Rxa1 30. Rxa1 Ke7 31. Ke2 b4 32. cxb4 Nxb4 33. Bb1 Nc6 34. Ra6 Nd4+ 35. Nxd4 exd4 36. Ra7+ Rd7 37. Rxd7+ Kxd7 38. Kd2 g5 39. e5 f5 40. g3 h6 41. f4 gxf4 42. gxf4 Kc6 43. Ke2 Kc5 44. Kd2 Kb4 45. Bc2 d3 46. Bd1 Bd5 0-1

[Event "DDR PV74 corr"]
[Site "DDR corr"]
[Date "1984.??.??"]
[Round "?"]
[White "Kort, W."]
[Black "Unterdoerfer, Edgar"]
[Result "1/2-1/2"]
[ECO "B25"]
[PlyCount "63"]
[EventDate "1984.??.??"]
[EventType "tourn (corr)"]
[EventCountry "DDR"]
[SourceTitle "Corr 2022"]
[Source "ChessBase"]
[SourceDate "2021.10.24"]
[SourceVersion "1"]
[SourceVersionDate "2021.10.24"]
[SourceQuality "1"]

1. e4 c5 2. Nc3 Nc6 3. g3 g6 4. Bg2 Bg7 5. d3 d6 6. f4 e5 7. Nh3 Nge7 8. 0-0 Nd4 9. Nd5 h6 10. c3 Ndc6 11. fxe5 Nxd5 12. exd5 Nxe5 13. Nf2 0-0 14. Be3 b6 15. Qd2 Kh7 16. Rae1 Bd7 17. Ne4 Bb5 18. c4 Bxc4 19. Bg5 hxg5 20. Nxg5+ Kg8 21. dxc4 Bh6 22. Rxe5 dxe5 23. h4 Qd6 24. Qf2 Bxg5 25. hxg5 Kg7 26. Qf6+ Qxf6 27. Rxf6 Rh8 28. d6 Rad8 29. Bd5 Rd7 30. Bc6 Rdd8 31. Bd5 Rd7 32. Bc6 1/2-1/2

[Event "DDR-ch M758 corr"]
[Site "DDR"]
[Date "1984.??.??"]
[Round "?"]
[White "Lippitsch, Paul"]
[Black "Unterdoerfer, Edgar"]
[Result "1/2-1/2"]
[ECO "B31"]
[PlyCount "70"]
[EventDate "1984.09.??"]
[EventType "tourn (corr)"]
[EventRounds "6"]
[EventCountry "DDR"]
[SourceTitle "Corr 2002"]
[Source "ChessBase"]
[SourceDate "2002.05.23"]
[SourceVersion "1"]
[SourceVersionDate "2002.05.23"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 Nc6 3. Bb5 g6 4. 0-0 Bg7 5. Re1 Nf6 6. e5 Nd5 7. d3 0-0 8. Bg5 Nc7 9. Bxc6 dxc6 10. h3 Ne6 11. Bh4 b6 12. Nbd2 Re8 13. Ne4 Nd4 14. Nd6 Rf8 15. b4 Ne6 16. Nxc8 Rxc8 17. bxc5 Nxc5 18. a4 h6 19. d4 Ne6 20. Ra3 g5 21. Bg3 Nc7 22. Rd3 e6 23. Qd2 b5 24. axb5 cxb5 25. Ra1 Ra8 26. Rda3 a6 27. Qd3 Qd7 28. Qe4 Qd5 29. Qxd5 exd5 30. e6 Nxe6 31. Rxa6 Rxa6 32. Rxa6 Nxd4 33. Nxd4 Bxd4 34. Rd6 Rc8 35. Rxd5 Bf6 1/2-1/2

[Event "DDR-ch M758 corr"]
[Site "DDR"]
[Date "1984.??.??"]
[Round "?"]
[White "Mueller, Erfried"]
[Black "Unterdoerfer, Edgar"]
[Result "1/2-1/2"]
[ECO "D01"]
[PlyCount "90"]
[EventDate "1984.09.??"]
[EventType "tourn (corr)"]
[EventRounds "6"]
[EventCountry "DDR"]
[SourceTitle "Corr 2002"]
[Source "ChessBase"]
[SourceDate "2002.05.23"]
[SourceVersion "1"]
[SourceVersionDate "2002.05.23"]
[SourceQuality "1"]

1. d4 d5 2. Nc3 Nf6 3. Bg5 Nbd7 4. Nf3 e6 5. e4 h6 6. Bh4 g5 7. Bg3 Nxe4 8. Nxe4 dxe4 9. Nd2 f5 10. h4 g4 11. Nc4 Bg7 12. Qd2 Nf6 13. 0-0-0 Nh5 14. Be5 0-0 15. Bxg7 Kxg7 16. Ne5 a6 17. Qc3 Kh7 18. f3 Ng3 19. Rg1 Nxf1 20. Rgxf1 exf3 21. gxf3 h5 22. fxg4 hxg4 23. h5 b5 24. d5 Re8 25. d6 cxd6 26. Nxg4 Rf8 27. Qe3 fxg4 28. Qe4+ Rf5 29. Qxa8 Qc7 30. Qe4 Qc4 31. Qxc4 bxc4 32. Rxf5 exf5 33. Rxd6 g3 34. Rg6 f4 35. Kd2 Bf5 36. Rg5 Kh6 37. Rxf5 g2 38. Rxf4 g1Q 39. Rxc4 Kxh5 40. b3 Kg5 41. Ra4 Qb6 42. Kd3 Kf5 43. Kd2 Ke5 44. Kd3 Qb5+ 45. Kc3 Qc5+ 1/2-1/2

[Event "DDR-ch M758 corr"]
[Site "DDR"]
[Date "1984.??.??"]
[Round "?"]
[White "Unterdoerfer, Edgar"]
[Black "Leisebein, Peter"]
[Result "1/2-1/2"]
[ECO "C29"]
[PlyCount "57"]
[EventDate "1984.09.??"]
[EventType "tourn (corr)"]
[EventRounds "6"]
[EventCountry "DDR"]
[SourceTitle "Corr 2002"]
[Source "ChessBase"]
[SourceDate "2002.05.23"]
[SourceVersion "1"]
[SourceVersionDate "2002.05.23"]
[SourceQuality "1"]

1. e4 e5 2. Nc3 Nf6 3. f4 d5 4. fxe5 Nxe4 5. d3 Nxc3 6. bxc3 d4 7. Nf3 dxc3 8. Be2 Nc6 9. 0-0 Nd4 10. Ng5 Bc5 11. Kh1 0-0 12. Ne4 Bb6 13. Bh5 Bf5 14. Bg5 Qd7 15. Nxc3 Bg6 16. Bg4 Qc6 17. Bd2 Rfe8 18. Re1 Re7 19. Bf3 Nxf3 20. Qxf3 Bd4 21. Qxc6 bxc6 22. Rab1 Rae8 23. e6 Rxe6 24. Rxe6 fxe6 25. Ne2 Bb6 26. Ng3 Rf8 27. Rf1 Rxf1+ 28. Nxf1 c5 29. Ne3 1/2-1/2

[Event "DDR-ch M758 corr"]
[Site "DDR"]
[Date "1984.??.??"]
[Round "?"]
[White "Unterdoerfer, Edgar"]
[Black "Raessler, Arndt"]
[Result "1-0"]
[ECO "C18"]
[PlyCount "77"]
[EventDate "1984.09.??"]
[EventType "tourn (corr)"]
[EventRounds "6"]
[EventCountry "DDR"]
[SourceTitle "Corr 2002"]
[Source "ChessBase"]
[SourceDate "2002.05.23"]
[SourceVersion "1"]
[SourceVersionDate "2002.05.23"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. Nc3 Bb4 4. e5 c5 5. a3 Ba5 6. b4 cxd4 7. Nb5 Bc7 8. f4 a6 9. Nxc7+ Qxc7 10. Bb2 Ne7 11. Nf3 Nd7 12. Bd3 Nb6 13. Bxd4 Bd7 14. 0-0 Bb5 15. Qe1 Na4 16. Rc1 Rc8 17. g4 h5 18. h3 Bxd3 19. cxd3 Qxc1 20. Qxc1 Rxc1 21. Rxc1 hxg4 22. hxg4 Kd7 23. Kg2 Nc6 24. Bf2 Nb2 25. Ne1 g5 26. Rb1 Na4 27. b5 axb5 28. Rxb5 b6 29. fxg5 Rg8 30. Nf3 Kc7 31. Kg3 Kb7 32. Rb1 Kc7 33. Rc1 Kd7 34. Rc2 Ra8 35. Kf4 Ra5 36. Be1 Rb5 37. Rxc6 Kxc6 38. Nd4+ Kc5 39. Nxe6+ 1-0

[Event "DDR-ch M758 corr"]
[Site "DDR"]
[Date "1984.??.??"]
[Round "?"]
[White "Unterdoerfer, Edgar"]
[Black "Wieland, Siegfried"]
[Result "1/2-1/2"]
[ECO "C29"]
[PlyCount "28"]
[EventDate "1984.09.??"]
[EventType "tourn (corr)"]
[EventRounds "6"]
[EventCountry "DDR"]
[SourceTitle "Corr 2002"]
[Source "ChessBase"]
[SourceDate "2002.05.23"]
[SourceVersion "1"]
[SourceVersionDate "2002.05.23"]
[SourceQuality "1"]

1. e4 e5 2. Nc3 Nf6 3. f4 d5 4. fxe5 Nxe4 5. d3 Nxc3 6. bxc3 c5 7. Nf3 Be7 8. Be2 0-0 9. 0-0 Nc6 10. Rb1 b6 11. Qe1 f6 12. Bf4 d4 13. c4 Be6 14. exf6 Bxf6 1/2-1/2

[Event "DDR-ch12 sf07 corr"]
[Site "DDR"]
[Date "1983.??.??"]
[Round "?"]
[White "Bergelt, Manfred"]
[Black "Unterdoerfer, Edgar"]
[Result "1/2-1/2"]
[ECO "B33"]
[PlyCount "119"]
[EventDate "1983.??.??"]
[EventType "tourn (corr)"]
[EventRounds "8"]
[EventCountry "DDR"]
[SourceTitle "Corr Nr. 1"]
[Source "ChessBase"]
[SourceDate "1997.09.01"]
[SourceVersion "2"]
[SourceVersionDate "2000.04.19"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 e5 6. Ndb5 d6 7. Bg5 a6 8. Na3 b5 9. Bxf6 gxf6 10. Nd5 f5 11. Bd3 Be6 12. Qh5 Bg7 13. 0-0 f4 14. c3 0-0 15. Nc2 a5 16. Bxb5 Bxd5 17. exd5 Ne7 18. Rad1 f5 19. g4 fxg3 20. hxg3 Rb8 21. a4 Rf6 22. Kg2 Rh6 23. Qe2 Ng6 24. Rh1 Qg5 25. Qd2 f4 26. Rxh6 Bxh6 27. Qd3 fxg3 28. Qxg3 Qf6 29. Ne3 Bf4 30. Qg4 Kh8 31. Qh3 Qg5+ 32. Kh1 Bxe3 33. fxe3 Qh4 34. Qxh4 Nxh4 35. Rf1 Kg7 36. b4 axb4 37. cxb4 h5 38. Kh2 Ng6 39. Rb1 e4 40. Bc6 Ne5 41. Kg3 Rf8 42. b5 Rf3+ 43. Kg2 h4 44. Rg1 Ng4 45. Bd7 Rg3+ 46. Kf1 Nxe3+ 47. Kf2 Rxg1 48. Kxg1 Nc4 49. Bf5 e3 50. Kf1 Kf6 51. Bd3 Na5 52. Ke2 Ke5 53. Kxe3 Kxd5 54. Be2 Kc5 55. Kf4 Kb4 56. Bd1 Nb7 57. Kg4 Ka5 58. Kxh4 d5 59. Kg5 Nd6 60. Kf4 1/2-1/2

[Event "DDR-ch12 sf07 corr"]
[Site "DDR"]
[Date "1983.??.??"]
[Round "?"]
[White "Broberg, Horst"]
[Black "Unterdoerfer, Edgar"]
[Result "1-0"]
[ECO "B31"]
[PlyCount "29"]
[EventDate "1983.??.??"]
[EventType "tourn (corr)"]
[EventRounds "8"]
[EventCountry "DDR"]
[SourceTitle "Corr Nr. 1"]
[Source "ChessBase"]
[SourceDate "1997.09.01"]
[SourceVersion "2"]
[SourceVersionDate "2000.04.19"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 Nc6 3. Bb5 g6 4. 0-0 Bg7 5. Nc3 e6 6. Bxc6 dxc6 7. e5 c4 8. Ne4 Qd5 9. Nd6+ Kf8 10. d4 cxd3 11. c4 Qa5 12. Qxd3 h6 13. Bd2 Qc7 14. Bb4 c5 15. Nb5 1-0

[Event "DDR-ch12 sf07 corr"]
[Site "DDR"]
[Date "1983.??.??"]
[Round "?"]
[White "Hentzgen, Klaus Dieter"]
[Black "Unterdoerfer, Edgar"]
[Result "1-0"]
[ECO "B33"]
[PlyCount "69"]
[EventDate "1983.??.??"]
[EventType "tourn (corr)"]
[EventRounds "8"]
[EventCountry "DDR"]
[SourceTitle "Corr Nr. 1"]
[Source "ChessBase"]
[SourceDate "1997.09.01"]
[SourceVersion "2"]
[SourceVersionDate "2000.04.19"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 e5 6. Ndb5 d6 7. Bg5 a6 8. Na3 b5 9. Nd5 Be7 10. Bxf6 Bxf6 11. c3 0-0 12. Nc2 Bg5 13. a4 bxa4 14. Rxa4 Bb7 15. Qa1 a5 16. Bc4 Ne7 17. 0-0 Nxd5 18. Bxd5 Qb6 19. Qa2 Rab8 20. b4 Bxd5 21. Qxd5 axb4 22. Nxb4 Qb5 23. Ra6 Qxd5 24. Nxd5 Rfd8 25. g3 Ra8 26. Rfa1 Rxa6 27. Rxa6 g6 28. Kf1 Rd7 29. Ke2 f5 30. f4 exf4 31. gxf4 Be7 32. exf5 gxf5 33. Ne3 Rc7 34. Nxf5 Bf6 35. Nxd6 1-0

[Event "DDR-ch12 sf07 corr"]
[Site "DDR"]
[Date "1983.??.??"]
[Round "?"]
[White "Kuehn, Peter"]
[Black "Unterdoerfer, Edgar"]
[Result "1-0"]
[ECO "A00"]
[PlyCount "53"]
[EventDate "1983.??.??"]
[EventType "tourn (corr)"]
[EventRounds "8"]
[EventCountry "DDR"]
[SourceTitle "Corr Nr. 1"]
[Source "ChessBase"]
[SourceDate "1997.09.01"]
[SourceVersion "2"]
[SourceVersionDate "2000.04.19"]
[SourceQuality "1"]

1. b4 e6 2. Bb2 Nf6 3. b5 d5 4. e3 Bd6 5. Nf3 Nbd7 6. c4 0-0 7. Be2 Re8 8. 0-0 c5 9. a4 b6 10. d3 Bb7 11. Nbd2 e5 12. cxd5 Nxd5 13. Nc4 Bc7 14. Qb3 N5f6 15. e4 h6 16. g3 a5 17. Nh4 Nf8 18. Ng2 Bc8 19. f4 Be6 20. f5 Bxc4 21. Qxc4 N8h7 22. Ne3 Kf8 23. Kg2 Re7 24. g4 Ke8 25. h4 g5 26. fxg6 fxg6 27. g5 1-0

[Event "DDR-ch12 sf07 corr"]
[Site "DDR"]
[Date "1983.??.??"]
[Round "?"]
[White "Unterdoerfer, Edgar"]
[Black "Demmer, Wolfgang"]
[Result "0-1"]
[ECO "B93"]
[PlyCount "98"]
[EventDate "1983.??.??"]
[EventType "tourn (corr)"]
[EventRounds "8"]
[EventCountry "DDR"]
[SourceTitle "Corr Nr. 1"]
[Source "ChessBase"]
[SourceDate "1997.09.01"]
[SourceVersion "2"]
[SourceVersionDate "2000.04.19"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. f4 Qb6 7. Nd5 Nxd5 8. exd5 Qa5+ 9. Qd2 Qxd5 10. Be2 Nc6 11. Nf3 Qxd2+ 12. Bxd2 Bf5 13. 0-0-0 Rc8 14. Bc3 Nb4 15. a3 Na2+ 16. Kd2 Nxc3 17. bxc3 g6 18. Nd4 Be4 19. Bf3 Bxf3 20. gxf3 Bh6 21. Ne2 Rc4 22. Kd3 Ra4 23. Ra1 Bxf4 24. Nxf4 Rxf4 25. Ke3 Rc4 26. Kd3 b5 27. a4 Rxa4 28. Rxa4 bxa4 29. Rb1 Kd7 30. Rb7+ Ke6 31. Ra7 Rc8 32. Rxa6 Rc5 33. Rxa4 Rh5 34. h4 Kf5 35. Ke3 e5 36. Rb4 f6 37. Ra4 Ke6 38. Rb4 f5 39. Kf2 f4 40. Kg2 Rxh4 41. Rb7 Rh5 42. Ra7 Rg5+ 43. Kf2 h5 44. c4 h4 45. Rh7 Rh5 46. Rg7 Kf6 47. Rd7 h3 48. Kg1 h2+ 49. Kh1 Ke6 0-1

[Event "DDR-ch12 sf07 corr"]
[Site "DDR"]
[Date "1983.??.??"]
[Round "?"]
[White "Unterdoerfer, Edgar"]
[Black "Essegern, Kurt"]
[Result "0-1"]
[ECO "B78"]
[PlyCount "58"]
[EventDate "1983.??.??"]
[EventType "tourn (corr)"]
[EventRounds "8"]
[EventCountry "DDR"]
[SourceTitle "Corr Nr. 1"]
[Source "ChessBase"]
[SourceDate "1997.09.01"]
[SourceVersion "2"]
[SourceVersionDate "2000.04.19"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 g6 5. Nc3 Bg7 6. Be3 Nf6 7. Bc4 0-0 8. Bb3 d6 9. f3 Bd7 10. Qd2 Rc8 11. h4 h5 12. 0-0-0 Ne5 13. Kb1 a5 14. Qe2 Rxc3 15. bxc3 b5 16. a3 a4 17. Ba2 Qc7 18. Bc1 Qxc3 19. Bb2 Qc5 20. c3 d5 21. exd5 Nxd5 22. Bxd5 Qxd5 23. Nc2 Qc5 24. Nb4 Be6 25. Na6 Qc8 26. Nb4 Nc4 27. Nd5 Qc5 28. Nb4 Nxb2 29. Qxb2 Bxc3 0-1

[Event "DDR-ch12 sf07 corr"]
[Site "DDR"]
[Date "1983.??.??"]
[Round "?"]
[White "Unterdoerfer, Edgar"]
[Black "Hein, Ralf"]
[Result "0-1"]
[ECO "B04"]
[PlyCount "82"]
[EventDate "1983.??.??"]
[EventType "tourn (corr)"]
[EventRounds "8"]
[EventCountry "DDR"]
[SourceTitle "Corr Nr. 1"]
[Source "ChessBase"]
[SourceDate "1997.09.01"]
[SourceVersion "2"]
[SourceVersionDate "2000.04.19"]
[SourceQuality "1"]

1. e4 Nf6 2. e5 Nd5 3. d4 d6 4. Nf3 g6 5. Be2 Bg7 6. c4 Nb6 7. exd6 cxd6 8. h3 0-0 9. 0-0 Nc6 10. Nc3 Bf5 11. Be3 d5 12. c5 Nc4 13. Bxc4 dxc4 14. Qa4 e5 15. Bg5 Qd7 16. d5 Nd4 17. Qxd7 Nxf3+ 18. gxf3 Bxd7 19. Kg2 Rfc8 20. Ne4 f5 21. Nf6+ Bxf6 22. Bxf6 Rxc5 23. d6 Kf7 24. Bg5 f4 25. Rfe1 Re8 26. h4 Rd5 27. Rad1 Rxd1 28. Rxd1 Ke6 29. Be7 Rc8 30. Rc1 b5 31. a3 Rc5 32. Kf1 Rd5 33. Ke2 Bc6 34. Rd1 Rxd1 35. Kxd1 Bxf3+ 36. Kd2 Bc6 37. Bf8 Kf5 38. Bh6 Kg4 39. Bg5 Kf3 40. Ke1 a5 41. Bd8 b4 0-1

[Event "DDR-ch M706 corr"]
[Site "DDR"]
[Date "1983.??.??"]
[Round "?"]
[White "Unterdoerfer, Edgar"]
[Black "Schultchen, Reinhard"]
[Result "1-0"]
[ECO "B43"]
[PlyCount "75"]
[EventDate "1983.01.??"]
[EventType "tourn (corr)"]
[EventRounds "6"]
[EventCountry "DDR"]
[SourceTitle "Corr 2002"]
[Source "ChessBase"]
[SourceDate "2002.05.23"]
[SourceVersion "1"]
[SourceVersionDate "2002.05.23"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 a6 5. Nc3 Qc7 6. Bd3 Bc5 7. Nb3 Ba7 8. Qe2 Nc6 9. Be3 Bxe3 10. Qxe3 Nf6 11. 0-0-0 b5 12. Rd2 Bb7 13. f4 d6 14. Rhd1 b4 15. Ne2 0-0 16. Ng3 a5 17. h3 Rfc8 18. Kb1 Ne7 19. Nd4 d5 20. e5 Nd7 21. Nh5 Ba6 22. Qg3 g6 23. Bxa6 Rxa6 24. Qg5 Nf5 25. Nxf5 exf5 26. Qh6 gxh5 27. Qxa6 Nc5 28. Qe2 Ne6 29. Qxh5 Nd4 30. Qg5+ Kf8 31. Qg3 Nb5 32. Qb3 d4 33. a4 bxa3 34. Qxb5 Rb8 35. Qd5 Rxb2+ 36. Ka1 Rb4 37. Qd6+ Qxd6 38. exd6 1-0

[Event "DDR-ch12 sf07 corr"]
[Site "DDR"]
[Date "1983.??.??"]
[Round "?"]
[White "Unterdoerfer, Edgar"]
[Black "Weinitschke, Guenter"]
[Result "1-0"]
[ECO "A42"]
[PlyCount "73"]
[EventDate "1983.??.??"]
[EventType "tourn (corr)"]
[EventRounds "8"]
[EventCountry "DDR"]
[SourceTitle "Corr Nr. 1"]
[Source "ChessBase"]
[SourceDate "1997.09.01"]
[SourceVersion "2"]
[SourceVersionDate "2000.04.19"]
[SourceQuality "1"]

1. e4 g6 2. d4 Bg7 3. c4 d6 4. Nc3 Nc6 5. Be3 e5 6. d5 Nd4 7. Nge2 Nxe2 8. Bxe2 f5 9. exf5 Bxf5 10. g4 Bd7 11. Qd2 Nf6 12. Rg1 0-0 13. 0-0-0 Ne8 14. Ne4 Nf6 15. f3 Nxe4 16. fxe4 Qe7 17. g5 c6 18. h4 Rac8 19. Kb1 cxd5 20. cxd5 a6 21. h5 gxh5 22. Bxh5 Be8 23. g6 Bxg6 24. Bxg6 hxg6 25. Rxg6 Rf7 26. Bh6 Rc7 27. Bxg7 Rxg7 28. Qh6 Rxg6 29. Qxg6+ Qg7 30. Qxd6 Rf7 31. Qe6 Qg2 32. d6 Qxe4+ 33. Ka1 Qf3 34. Qe8+ Kg7 35. Rg1+ Kh6 36. Qh8+ Rh7 37. Qxe5 1-0

[Event "DDR-ch M corr"]
[Site "DDR"]
[Date "1981.??.??"]
[Round "?"]
[White "Unterdoerfer, Edgar"]
[Black "Schumacher, Bernd"]
[Result "0-1"]
[ECO "B85"]
[PlyCount "52"]
[EventDate "1981.??.??"]
[EventType "swiss (corr)"]
[EventRounds "10"]
[EventCountry "DDR"]
[SourceTitle "Corr Nr. 1"]
[Source "ChessBase"]
[SourceDate "1997.09.01"]
[SourceVersion "2"]
[SourceVersionDate "2000.04.19"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 d6 6. Be2 Be7 7. 0-0 0-0 8. Be3 a6 9. f4 Qc7 10. Bf3 Nc6 11. Nb3 Rb8 12. g4 b5 13. g5 Nd7 14. a3 Bb7 15. Qe2 Nb6 16. a4 b4 17. a5 Nxa5 18. Nxa5 bxc3 19. b3 Ba8 20. Bxb6 Rxb6 21. Nc4 Rb4 22. Bg2 d5 23. exd5 Bxd5 24. Rxa6 Rxc4 25. bxc4 Bxc4 26. Rc6 Qxc6 0-1

[Event "DDR-ch M665 corr"]
[Site "DDR"]
[Date "1981.??.??"]
[Round "?"]
[White "Walther, Joachim"]
[Black "Unterdoerfer, Edgar"]
[Result "1-0"]
[ECO "B33"]
[PlyCount "107"]
[EventDate "1981.04.??"]
[EventType "tourn (corr)"]
[EventRounds "10"]
[EventCountry "DDR"]
[SourceTitle "Corr 2002"]
[Source "ChessBase"]
[SourceDate "2002.05.23"]
[SourceVersion "1"]
[SourceVersionDate "2002.05.23"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 e5 6. Ndb5 d6 7. Bg5 a6 8. Bxf6 gxf6 9. Na3 b5 10. Nd5 f5 11. exf5 Bxf5 12. c3 Bg7 13. Nc2 0-0 14. Nce3 Be4 15. Be2 Ne7 16. Bf3 Nxd5 17. Nxd5 Bxd5 18. Qxd5 Rb8 19. Rd1 Rb6 20. 0-0 Qe7 21. Qb3 Qc7 22. Bd5 Kh8 23. Rd3 f5 24. Rh3 Rbb8 25. Qd1 Rf6 26. Kh1 Rg6 27. Qh5 Rh6 28. Qxf5 Rf8 29. Qd3 Rxh3 30. Qxh3 Rf6 31. Be4 Bf8 32. f3 Rf7 33. Rd1 Qd7 34. g4 Rg7 35. Qg3 Qf7 36. Bd5 Qf6 37. Qg1 Qd8 38. Qe3 Be7 39. Qa7 Qc8 40. Bb7 Bf8 41. Bxc8 Rxa7 42. Rd5 Ra8 43. Bf5 h6 44. h3 Kg7 45. Kg2 Rb8 46. Bd3 Rb6 47. b3 Rc6 48. c4 b4 49. Ra5 Be7 50. Be4 Rb6 51. Bf5 Bd8 52. Rd5 Rc6 53. Be4 Rb6 54. c5 1-0

[Event "DDR-ch M640 corr"]
[Site "DDR"]
[Date "1980.??.??"]
[Round "?"]
[White "Dittmar, Olaf"]
[Black "Unterdoerfer, Edgar"]
[Result "1/2-1/2"]
[ECO "C43"]
[PlyCount "89"]
[EventDate "1980.03.??"]
[EventType "tourn (corr)"]
[EventRounds "10"]
[EventCountry "DDR"]
[SourceTitle "Corr 2002"]
[Source "ChessBase"]
[SourceDate "2002.05.23"]
[SourceVersion "1"]
[SourceVersionDate "2002.05.23"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nf6 3. d4 exd4 4. e5 Ne4 5. Qxd4 d5 6. exd6 Nxd6 7. Nc3 Nc6 8. Qf4 Bf5 9. Bb5 Qe7+ 10. Be3 Nxb5 11. Nxb5 Qb4+ 12. Qxb4 Bxb4+ 13. c3 Bd6 14. Nxd6+ cxd6 15. 0-0-0 Ne5 16. Nh4 Be6 17. Rxd6 Bxa2 18. Bd4 f6 19. f4 g5 20. fxg5 0-0 21. gxf6 Nc6 22. Be3 Rad8 23. Rxd8 Rxd8 24. g4 Rd6 25. g5 Bb3 26. Nf5 Rd5 27. Nh6+ Kf8 28. Re1 Ne5 29. Rh1 b6 30. h4 Nf7 31. Nxf7 Kxf7 32. Re1 Kg6 33. Bd4 Rd7 34. Kd2 Kh5 35. Re4 Bd5 36. Rf4 b5 37. b4 a6 38. Ke3 Kg6 39. Kf2 Kh5 40. Kg3 Kg6 41. Rf1 Rf7 42. Re1 Bc6 43. Re7 Rxe7 44. fxe7 Kf5 45. Bg7 1/2-1/2

[Event "DDR-ch M638 corr"]
[Site "DDR"]
[Date "1980.??.??"]
[Round "?"]
[White "Mueller, Siegfried"]
[Black "Unterdoerfer, Edgar"]
[Result "0-1"]
[ECO "A18"]
[PlyCount "42"]
[EventDate "1980.02.??"]
[EventType "tourn (corr)"]
[EventRounds "10"]
[EventCountry "DDR"]
[SourceTitle "Corr 2002"]
[Source "ChessBase"]
[SourceDate "2002.05.23"]
[SourceVersion "1"]
[SourceVersionDate "2002.05.23"]
[SourceQuality "1"]

1. c4 Nf6 2. Nc3 e6 3. e4 d5 4. e5 d4 5. exf6 dxc3 6. bxc3 Qxf6 7. d4 c5 8. Nf3 h6 9. Be2 Bd6 10. 0-0 0-0 11. Be3 Nc6 12. dxc5 Bc7 13. Nd4 e5 14. Nb5 Bb8 15. Bf3 Rd8 16. Qe2 e4 17. Bg4 Qh4 18. h3 f5 19. Bh5 f4 20. Bd4 f3 21. Bxf3 Qf4 0-1

[Event "DDR-ch M638 corr"]
[Site "DDR"]
[Date "1980.??.??"]
[Round "?"]
[White "Poetzschmann, Rolf"]
[Black "Unterdoerfer, Edgar"]
[Result "1/2-1/2"]
[ECO "C42"]
[PlyCount "102"]
[EventDate "1980.02.??"]
[EventType "tourn (corr)"]
[EventRounds "10"]
[EventCountry "DDR"]
[SourceTitle "Corr 2002"]
[Source "ChessBase"]
[SourceDate "2002.05.23"]
[SourceVersion "1"]
[SourceVersionDate "2002.05.23"]
[SourceQuality "1"]

1. e4 e5 2. Bc4 Nf6 3. Nf3 Nxe4 4. Nc3 Nf6 5. Nxe5 d5 6. Bb3 c6 7. d3 Bd6 8. Qe2 0-0 9. 0-0 Re8 10. d4 Nbd7 11. f4 Qc7 12. h3 a5 13. Qf3 b5 14. a3 Bb7 15. g4 a4 16. Ba2 b4 17. axb4 Bxb4 18. Nd1 Ne4 19. c3 Bf8 20. Ne3 Nxe5 21. fxe5 Ng5 22. Qg2 Ne6 23. Bb1 g6 24. g5 Qd7 25. Ng4 Bg7 26. Be3 Rec8 27. Nf6+ Bxf6 28. gxf6 Kf8 29. Bf5 Ke8 30. Qg4 h5 31. Bxe6 hxg4 32. Bxd7+ Kxd7 33. hxg4 Ba6 34. Rf2 Bb5 35. Bh6 Ke6 36. Kg2 Rh8 37. Rh1 Bd3 38. Kg3 Bc4 39. Rfh2 Rab8 40. Kf4 Bb3 41. Kg5 Ra8 42. Bg7 Rxh2 43. Rxh2 Bd1 44. Rh4 Rb8 45. Kh6 Rxb2 46. Bf8 Rb8 47. Kg7 Bb3 48. Kg8 Rb7 49. Kg7 Rb8 50. Rh7 Bd1 51. Rh1 Bb3 1/2-1/2

[Event "DDR-ch M640 corr"]
[Site "DDR"]
[Date "1980.??.??"]
[Round "?"]
[White "Unterdoerfer, Edgar"]
[Black "Beier, Paul"]
[Result "1/2-1/2"]
[ECO "C18"]
[PlyCount "90"]
[EventDate "1980.03.??"]
[EventType "tourn (corr)"]
[EventRounds "10"]
[EventCountry "DDR"]
[SourceTitle "Corr 2002"]
[Source "ChessBase"]
[SourceDate "2002.05.23"]
[SourceVersion "1"]
[SourceVersionDate "2002.05.23"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. Nc3 Bb4 4. e5 c5 5. a3 Bxc3+ 6. bxc3 Ne7 7. Qg4 cxd4 8. Qxg7 Rg8 9. Qxh7 Qc7 10. Ne2 Nbc6 11. f4 Bd7 12. Qd3 dxc3 13. h4 Nf5 14. h5 0-0-0 15. h6 Rg6 16. h7 Rh8 17. Rb1 f6 18. exf6 Be8 19. Qxc3 Rxh7 20. Rxh7 Qxh7 21. Rb3 d4 22. Qh3 Qg8 23. Qh2 Rxf6 24. Rh3 Rf8 25. Ng3 Ne3 26. Bxe3 dxe3 27. Ne4 Qg7 28. Rxe3 Qa1+ 29. Kf2 Ne5 30. Be2 Kb8 31. g3 Qb2 32. Qh6 Ng6 33. Rc3 Qb6+ 34. Kg2 Qd4 35. Rc4 Qe3 36. Bf3 Nxf4+ 37. gxf4 Rg8+ 38. Ng5 Bg6 39. Qh4 Rd8 40. Ne4 Rg8 41. Ng3 Bf5 42. a4 a6 43. a5 Qe1 44. Qh2 Qd2+ 45. Kg1 Qe1+ 1/2-1/2

[Event "DDR-ch M638 corr"]
[Site "DDR"]
[Date "1980.??.??"]
[Round "?"]
[White "Unterdoerfer, Edgar"]
[Black "Braune, Herbert"]
[Result "1-0"]
[ECO "B85"]
[PlyCount "79"]
[EventDate "1980.02.??"]
[EventType "tourn (corr)"]
[EventRounds "10"]
[EventCountry "DDR"]
[SourceTitle "Corr 2002"]
[Source "ChessBase"]
[SourceDate "2002.05.23"]
[SourceVersion "1"]
[SourceVersionDate "2002.05.23"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Be2 e6 7. 0-0 Be7 8. f4 Nc6 9. Be3 0-0 10. Qd2 Nxd4 11. Qxd4 e5 12. fxe5 dxe5 13. Qxe5 Ng4 14. Qd4 Nxe3 15. Qxe3 Be6 16. Bd3 Rc8 17. Kh1 Qc7 18. Ne2 Qe5 19. c3 Rfd8 20. Rfd1 Bd6 21. g3 f5 22. Qd4 fxe4 23. Qxe5 Bxe5 24. Bxe4 Rxd1+ 25. Rxd1 Bxa2 26. Bxb7 Rb8 27. Bd5+ Bxd5+ 28. Rxd5 Rb5 29. Rxb5 axb5 30. Kg2 Kf7 31. Kf3 b4 32. cxb4 Bxb2 33. Ke4 Ke6 34. Nf4+ Kd6 35. Kf5 Bc3 36. b5 Kc5 37. b6 Kc6 38. Ke6 Bd4 39. Nd5 h5 40. Nf4 1-0

[Event "6PZ/13 DDR corr"]
[Site "DDR corr"]
[Date "1980.??.??"]
[Round "?"]
[White "Unterdoerfer, Edgar"]
[Black "Fessling, Roland"]
[Result "1-0"]
[ECO "C18"]
[PlyCount "69"]
[EventDate "1984.??.??"]
[EventType "tourn (corr)"]
[EventCountry "DDR"]
[SourceTitle "Corr 2022"]
[Source "ChessBase"]
[SourceDate "2021.10.24"]
[SourceVersion "1"]
[SourceVersionDate "2021.10.24"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. Nc3 Bb4 4. e5 c5 5. a3 Bxc3+ 6. bxc3 cxd4 7. Qg4 Ne7 8. Qxg7 Rg8 9. Qxh7 Qc7 10. Ne2 Nbc6 11. f4 Bd7 12. Qd3 dxc3 13. Ng3 0-0-0 14. Be2 Nf5 15. Nxf5 exf5 16. 0-0 d4 17. Bf3 Qb6 18. a4 Na5 19. Bd5 Rg7 20. Kh1 Rdg8 21. Ba3 Be6 22. Bxe6+ fxe6 23. Rg1 Qc6 24. Qf3 Qxf3 25. gxf3 Kd7 26. Rxg7+ Rxg7 27. Bc5 Nc4 28. Bxd4 Nd2 29. Bxc3 Nxf3 30. Rf1 Nh4 31. Rg1 Rh7 32. Rg3 Rh8 33. Rh3 Ng6 34. Rxh8 Nxh8 35. Kg2 1-0

[Event "DDR-ch M638 corr"]
[Site "DDR"]
[Date "1980.??.??"]
[Round "?"]
[White "Unterdoerfer, Edgar"]
[Black "Franz, Reinhardt"]
[Result "1-0"]
[ECO "B05"]
[PlyCount "75"]
[EventDate "1980.02.??"]
[EventType "tourn (corr)"]
[EventRounds "10"]
[EventCountry "DDR"]
[SourceTitle "Corr 2002"]
[Source "ChessBase"]
[SourceDate "2002.05.23"]
[SourceVersion "1"]
[SourceVersionDate "2002.05.23"]
[SourceQuality "1"]

1. e4 Nf6 2. e5 Nd5 3. d4 d6 4. Nf3 Bg4 5. Be2 e6 6. 0-0 Be7 7. c4 Nb6 8. Nc3 0-0 9. Be3 Nc6 10. exd6 cxd6 11. b3 Bf6 12. a3 Rc8 13. Rc1 Ne7 14. h3 Bxf3 15. Bxf3 d5 16. c5 Nd7 17. Nb5 Qa5 18. Nd6 Rb8 19. g4 Nc8 20. Bf4 a6 21. Qd3 Qxa3 22. Rfe1 b6 23. Nxc8 Rbxc8 24. c6 Nb8 25. c7 Nd7 26. g5 Be7 27. Rc6 Qa5 28. Rec1 Rfe8 29. Be2 e5 30. Bg4 exf4 31. Bxd7 Ba3 32. Bxe8 Bxc1 33. Rxc1 Qa3 34. Bxf7+ Kf8 35. Rc6 Qe7 36. Qf5 Rxc7 37. Bxd5+ Ke8 38. Re6 1-0

[Event "DDR-ch M640 corr"]
[Site "DDR"]
[Date "1980.??.??"]
[Round "?"]
[White "Unterdoerfer, Edgar"]
[Black "Schulz, Michael"]
[Result "1/2-1/2"]
[ECO "C18"]
[PlyCount "82"]
[EventDate "1980.03.??"]
[EventType "tourn (corr)"]
[EventRounds "10"]
[EventCountry "DDR"]
[SourceTitle "Corr 2002"]
[Source "ChessBase"]
[SourceDate "2002.05.23"]
[SourceVersion "1"]
[SourceVersionDate "2002.05.23"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. Nc3 Bb4 4. e5 c5 5. a3 Ba5 6. b4 cxd4 7. Qg4 Ne7 8. bxa5 dxc3 9. Qxg7 Rg8 10. Qxh7 Nbc6 11. f4 Qxa5 12. Nf3 Bd7 13. Ng5 Rf8 14. Rb1 0-0-0 15. Nxf7 Rxf7 16. Qxf7 Be8 17. Qxe6+ Bd7 18. Qf6 Bf5 19. Bb5 Bxc2 20. Bxc6 Nxc6 21. Qe6+ Kb8 22. Qxc6 Bxb1 23. Qf6 Be4 24. 0-0 Qc5+ 25. Rf2 Rg8 26. Qd6+ Qxd6 27. exd6 d4 28. f5 d3 29. f6 Rf8 30. Kf1 b5 31. g4 Kc8 32. g5 Kd7 33. Rf4 Bd5 34. Rd4 Ke6 35. Kf2 Bc4 36. d7 Rd8 37. Ke3 Rxd7 38. Rxd7 Kxd7 39. g6 a5 40. f7 Ke7 41. h4 d2 1/2-1/2

[Event "DDR-Cup6 sf13 corr"]
[Site "DDR"]
[Date "1979.??.??"]
[Round "?"]
[White "Schuerer, Hans"]
[Black "Unterdoerfer, Edgar"]
[Result "1/2-1/2"]
[ECO "C36"]
[PlyCount "85"]
[EventDate "1979.??.??"]
[EventType "tourn (corr)"]
[EventRounds "11"]
[EventCountry "DDR"]
[SourceTitle "Corr Nr. 1"]
[Source "ChessBase"]
[SourceDate "1997.09.01"]
[SourceVersion "2"]
[SourceVersionDate "2000.04.19"]
[SourceQuality "1"]

1. e4 e5 2. f4 exf4 3. Nf3 d5 4. exd5 Nf6 5. Bb5+ c6 6. dxc6 Nxc6 7. d4 Bd6 8. 0-0 0-0 9. Na3 Bxa3 10. bxa3 Nd5 11. Qd3 g5 12. c4 Nc7 13. Nxg5 Qxd4+ 14. Qxd4 Nxd4 15. Bxf4 Ne2+ 16. Kh1 Nxf4 17. Rxf4 Nxb5 18. cxb5 Be6 19. Nxe6 fxe6 20. Raf1 Rxf4 21. Rxf4 Rd8 22. h4 Rd2 23. Ra4 Rb2 24. Ra5 b6 25. Rxa7 Rxb5 26. a4 Rb2 27. a5 b5 28. Rb7 Rxa2 29. Rxb5 Kf7 30. Rb7+ Kg6 31. Ra7 Ra4 32. g3 Ra2 33. a6 h5 34. Ra8 Kg7 35. a7 e5 36. Re8 Rxa7 37. Rxe5 Kh6 38. Kg2 Ra3 39. Kf2 Kg6 40. Re6+ Kg7 41. Re3 Rxe3 42. Kxe3 Kf6 43. Kf3 1/2-1/2

[Event "DDR-Cup6 sf13 corr"]
[Site "DDR"]
[Date "1979.??.??"]
[Round "?"]
[White "Trautmann, Klaus"]
[Black "Unterdoerfer, Edgar"]
[Result "1-0"]
[ECO "C95"]
[PlyCount "133"]
[EventDate "1979.??.??"]
[EventType "tourn (corr)"]
[EventRounds "11"]
[EventCountry "DDR"]
[SourceTitle "Corr Nr. 1"]
[Source "ChessBase"]
[SourceDate "1997.09.01"]
[SourceVersion "2"]
[SourceVersionDate "2000.04.19"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. 0-0 Be7 6. Re1 b5 7. Bb3 d6 8. c3 0-0 9. h3 Nb8 10. d4 Nbd7 11. Nbd2 Bb7 12. Bc2 Re8 13. b4 Bf8 14. a4 g6 15. Bb2 Bg7 16. d5 bxa4 17. Bxa4 Rf8 18. Nb3 Nb6 19. Na5 Nxa4 20. Qxa4 Bc8 21. Nc6 Qd7 22. c4 Bb7 23. Bc1 h6 24. Nd2 Nh5 25. Na5 Bc8 26. Qxd7 Bxd7 27. Nf1 f5 28. f3 fxe4 29. fxe4 Nf4 30. Ra3 Kh7 31. Be3 Bc8 32. Kh2 Nh5 33. c5 Nf6 34. Nd2 h5 35. cxd6 cxd6 36. Nac4 Ne8 37. Nb6 Rb8 38. Nxc8 Rxc8 39. Rxa6 Bh6 40. Nf3 Rc2 41. Bxh6 Kxh6 42. Re3 Rb2 43. Ra8 Rxb4 44. h4 Nf6 45. Rxf8 Ng4+ 46. Kh3 Nxe3 47. Ng5 Kg7 48. Rf7+ Kg8 49. Rf6 Kg7 50. Rxd6 Ng4 51. Rd7+ Kf8 52. Rf7+ Kg8 53. Rf3 Rd4 54. Kg3 Rd1 55. Ne6 Rd2 56. Nc5 Rd1 57. Nd3 Kg7 58. Nf2 Nxf2 59. Rxf2 Rd3+ 60. Rf3 Rd4 61. Re3 Kf7 62. Kf3 Rd1 63. Ra3 Rd4 64. g3 Ke7 65. Ra6 Rd3+ 66. Kf2 Kf7 67. Re6 1-0

[Event "DDR-ch H265 corr"]
[Site "DDR"]
[Date "1979.??.??"]
[Round "?"]
[White "Unterdoerfer, Edgar"]
[Black "Haessler, Wolfgang"]
[Result "0-1"]
[ECO "B09"]
[PlyCount "64"]
[EventDate "1979.??.??"]
[EventType "tourn (corr)"]
[EventRounds "10"]
[EventCountry "DDR"]
[SourceTitle "Corr Nr. 1"]
[Source "ChessBase"]
[SourceDate "1997.09.01"]
[SourceVersion "2"]
[SourceVersionDate "2000.04.19"]
[SourceQuality "1"]

1. e4 g6 2. d4 Bg7 3. f4 d6 4. Nc3 Nc6 5. Be3 Nf6 6. Nf3 0-0 7. h3 e5 8. fxe5 dxe5 9. d5 Nb8 10. Bc4 Ne8 11. g4 Nd6 12. Qe2 a6 13. 0-0-0 b5 14. Bb3 a5 15. Nxb5 Ba6 16. c4 Nxe4 17. Bf4 exf4 18. Qxe4 a4 19. Bxa4 Bxb5 20. cxb5 Qf6 21. Rh2 Nd7 22. g5 Qd6 23. Bb3 Nc5 24. Qc2 Rfe8 25. Nd2 f3 26. Nc4 Nxb3+ 27. Kb1 Qg3 28. axb3 Re1 29. Rh1 f2 30. Rf1 Qg1 31. Qd3 Rae8 32. Kc2 R8e2+ 0-1

[Event "DDR-Cup6 sf13 corr"]
[Site "DDR"]
[Date "1979.??.??"]
[Round "?"]
[White "Unterdoerfer, Edgar"]
[Black "Ketzscher, Roland"]
[Result "1-0"]
[ECO "C29"]
[PlyCount "61"]
[EventDate "1979.??.??"]
[EventType "tourn (corr)"]
[EventRounds "11"]
[EventCountry "DDR"]
[SourceTitle "Corr Nr. 1"]
[Source "ChessBase"]
[SourceDate "1997.09.01"]
[SourceVersion "2"]
[SourceVersionDate "2000.04.19"]
[SourceQuality "1"]

1. e4 e5 2. Nc3 Nf6 3. f4 d5 4. fxe5 Nxe4 5. d3 Bb4 6. dxe4 Qh4+ 7. Ke2 Nc6 8. Nf3 Bg4 9. Nxd5 0-0-0 10. c3 f5 11. exf6 Rhe8 12. Kd3 Rxd5+ 13. Kc2 Qf2+ 14. Qe2 Qc5 15. Be3 Rd4 16. fxg7 Ba5 17. Qb5 Qxb5 18. Bxb5 Rdxe4 19. Bxc6 bxc6 20. Rae1 Bf5 21. Kc1 Rg8 22. Bh6 Ra4 23. Re5 Bg6 24. a3 Bb6 25. Rhe1 Rc4 26. h4 Rc5 27. h5 Bxh5 28. Rxc5 Bxc5 29. Re5 Bxf3 30. gxf3 Bd6 31. Rf5 1-0

[Event "DDR-ch H265 corr"]
[Site "DDR"]
[Date "1979.??.??"]
[Round "?"]
[White "Unterdoerfer, Edgar"]
[Black "Klugmann, Rainer"]
[Result "1-0"]
[ECO "C29"]
[PlyCount "65"]
[EventDate "1979.??.??"]
[EventType "tourn (corr)"]
[EventRounds "10"]
[EventCountry "DDR"]
[SourceTitle "Corr Nr. 1"]
[Source "ChessBase"]
[SourceDate "1997.09.01"]
[SourceVersion "2"]
[SourceVersionDate "2000.04.19"]
[SourceQuality "1"]

1. e4 e5 2. Nc3 Nf6 3. f4 d5 4. fxe5 Nxe4 5. d3 Qh4+ 6. g3 Nxg3 7. Nf3 Qh5 8. Nxd5 Nxh1 9. Nxc7+ Kd8 10. Nxa8 Be7 11. Bg2 Bh4+ 12. Kf1 Nc6 13. Bxh1 Bh3+ 14. Bg2 Nd4 15. Bxh3 Nxf3 16. Be3 Be7 17. Kg2 Nh4+ 18. Kg3 Qxe5+ 19. Bf4 Qd4 20. c3 Qd5 21. Qe2 Ng6 22. Bc7+ Ke8 23. Kf2 f5 24. Bg2 Qd7 25. Be5 Kf7 26. Nc7 Rd8 27. Bd5+ Kf8 28. Ne6+ Ke8 29. Nxg7+ Kf8 30. Ne6+ Ke8 31. Qh5 Bh4+ 32. Kg1 Rc8 33. Nf4 1-0

[Event "DDR-Cup6 sf13 corr"]
[Site "DDR"]
[Date "1979.??.??"]
[Round "?"]
[White "Unterdoerfer, Edgar"]
[Black "Morgner, Guenter"]
[Result "1-0"]
[ECO "C33"]
[PlyCount "117"]
[EventDate "1979.??.??"]
[EventType "tourn (corr)"]
[EventRounds "11"]
[EventCountry "DDR"]
[SourceTitle "Corr Nr. 1"]
[Source "ChessBase"]
[SourceDate "1997.09.01"]
[SourceVersion "2"]
[SourceVersionDate "2000.04.19"]
[SourceQuality "1"]

1. e4 e5 2. Nc3 Nc6 3. f4 exf4 4. Nf3 Nf6 5. Bc4 Be7 6. e5 Ng4 7. d4 Bh4+ 8. Kf1 0-0 9. Bxf4 Nf2 10. Qe1 Nxh1 11. Qxh4 Qxh4 12. Nxh4 Nxd4 13. Nd5 Ne6 14. Bd2 c6 15. Ne7+ Kh8 16. Kg1 Re8 17. Nxc8 Raxc8 18. Nf5 Rc7 19. Nd6 Rf8 20. Kxh1 b6 21. a4 Kg8 22. a5 b5 23. Bd3 a6 24. Be3 c5 25. Rf1 Nd4 26. Be4 f5 27. exf6 Rxf6 28. Rxf6 gxf6 29. Ne8 Rc8 30. Nxf6+ Kf7 31. Nxh7 Re8 32. Ng5+ Kf6 33. h4 d5 34. Bxd4+ cxd4 35. Bxd5 Re5 36. Bb7 b4 37. Nf3 Rxa5 38. Nxd4 Ra2 39. b3 a5 40. Ba6 Ke5 41. h5 Kxd4 42. h6 Ra1+ 43. Kh2 Re1 44. h7 Re8 45. Bc4 Rh8 46. Bg8 Kc3 47. g4 Kxc2 48. g5 a4 49. bxa4 b3 50. Bxb3+ Kxb3 51. g6 Kxa4 52. Kg3 Kb5 53. Kg4 Kc6 54. Kg5 Kd7 55. Kh6 Re8 56. g7 Re6+ 57. Kg5 Re1 58. g8Q Rg1+ 59. Kf4 1-0

[Event "DDR-Cup6 sf13 corr"]
[Site "DDR"]
[Date "1979.??.??"]
[Round "?"]
[White "Unterdoerfer, Edgar"]
[Black "Schmidt, Hans Gerd"]
[Result "0-1"]
[ECO "B33"]
[PlyCount "96"]
[EventDate "1979.??.??"]
[EventType "tourn (corr)"]
[EventRounds "11"]
[EventCountry "DDR"]
[SourceTitle "Corr Nr. 1"]
[Source "ChessBase"]
[SourceDate "1997.09.01"]
[SourceVersion "2"]
[SourceVersionDate "2000.04.19"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 e5 6. Ndb5 d6 7. a4 a6 8. Na3 d5 9. Nxd5 Nxe4 10. Be3 Bc5 11. Bxc5 Nxc5 12. Nc4 Nd4 13. Ncb6 Bf5 14. Rc1 0-0 15. Bc4 Qg5 16. Ne3 Rad8 17. Bd5 Rd6 18. a5 Be4 19. Bxe4 Nxe4 20. Qg4 Qxg4 21. Nxg4 Nc6 22. Nc4 Rd5 23. f3 Ng5 24. Ra1 f5 25. Nge3 Rc5 26. b3 f4 27. Nd1 e4 28. fxe4 f3 29. gxf3 Rxf3 30. Nf2 Ne5 31. Nxe5 Rxe5 32. 0-0 Rc3 33. Nd3 Rxe4 34. Ne1 Re2 35. Ra4 h6 36. Ra1 Nh3+ 37. Kh1 Nf2+ 38. Kg1 Ng4 39. Nf3 Rcxc2 40. b4 Nxh2 41. Nd4 Nxf1 42. Nxe2 Rxe2 43. Kxf1 Re5 44. Rd1 Re4 45. Rb1 Kf7 46. b5 Re5 47. bxa6 bxa6 48. Ra1 Ke6 0-1

[Event "DDR-Cup corr"]
[Site "DDR"]
[Date "1978.??.??"]
[Round "?"]
[White "Unterdoerfer, Edgar"]
[Black "Dietze, Otto"]
[Result "1-0"]
[ECO "B09"]
[PlyCount "63"]
[EventDate "1978.??.??"]
[EventType "tourn (corr)"]
[EventRounds "10"]
[EventCountry "DDR"]
[SourceTitle "Corr Nr. 1"]
[Source "ChessBase"]
[SourceDate "1997.09.01"]
[SourceVersion "2"]
[SourceVersionDate "2000.04.19"]
[SourceQuality "1"]

1. e4 d6 2. d4 Nf6 3. Nc3 g6 4. f4 Bg7 5. Nf3 0-0 6. Bd3 Nc6 7. e5 dxe5 8. fxe5 Nh5 9. Be3 Bg4 10. Be4 f6 11. exf6 Nxf6 12. Bxc6 bxc6 13. 0-0 Nd5 14. Nxd5 cxd5 15. h3 Bf5 16. c3 Qd6 17. Qd2 Be4 18. Ng5 e5 19. Nxe4 dxe4 20. d5 Qa6 21. Rfd1 Rad8 22. Qc2 Qb7 23. c4 Rf7 24. b3 Rfd7 25. Qxe4 c6 26. Bg5 cxd5 27. cxd5 Rxd5 28. Qc4 R8d7 29. Rxd5 Qxd5 30. Qc8+ Bf8 31. Rf1 Rd8 32. Qxd8 1-0

[Event "DDR-Cup corr"]
[Site "DDR"]
[Date "1978.??.??"]
[Round "?"]
[White "Unterdoerfer, Edgar"]
[Black "Pamperin, Gerhard"]
[Result "1-0"]
[ECO "C29"]
[PlyCount "75"]
[EventDate "1978.??.??"]
[EventType "tourn (corr)"]
[EventRounds "10"]
[EventCountry "DDR"]
[SourceTitle "Corr Nr. 1"]
[Source "ChessBase"]
[SourceDate "1997.09.01"]
[SourceVersion "2"]
[SourceVersionDate "2000.04.19"]
[SourceQuality "1"]

1. e4 e5 2. Nc3 Nf6 3. f4 d5 4. fxe5 Nxe4 5. d3 Nxc3 6. bxc3 Nc6 7. Nf3 d4 8. Be2 dxc3 9. 0-0 Bc5+ 10. Kh1 0-0 11. Qe1 Bg4 12. Qg3 Bh5 13. Ng1 Bg6 14. h4 Bxg1 15. Rxg1 Nd4 16. Bd1 Nf5 17. Qg5 Nxh4 18. Qxd8 Raxd8 19. Bg5 Rd4 20. g4 Bxd3 21. Bxh4 Be4+ 22. Kh2 Rd2+ 23. Kh3 Bxc2 24. Bxc2 Rxc2 25. Rgc1 Rxc1 26. Rxc1 c5 27. Rxc3 Rc8 28. Bf2 b6 29. Kg3 Kf8 30. Kf4 Ke7 31. g5 Ke6 32. Ke4 a6 33. a4 Rc6 34. Rb3 Kd7 35. Rd3+ Kc7 36. Rf3 Rg6 37. Rxf7+ Kc6 38. Be3 1-0

[Event "DDR-Cup5 sf08 corr"]
[Site "DDR"]
[Date "1977.??.??"]
[Round "?"]
[White "Apel, Arno"]
[Black "Unterdoerfer, Edgar"]
[Result "0-1"]
[ECO "C95"]
[PlyCount "106"]
[EventDate "1977.??.??"]
[EventType "tourn (corr)"]
[EventRounds "10"]
[EventCountry "DDR"]
[SourceTitle "Corr Nr. 1"]
[Source "ChessBase"]
[SourceDate "1997.09.01"]
[SourceVersion "2"]
[SourceVersionDate "2000.04.19"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. 0-0 Be7 6. Re1 b5 7. Bb3 d6 8. c3 0-0 9. h3 Nb8 10. d4 Nbd7 11. Nbd2 Bb7 12. Bc2 Re8 13. Nf1 Bf8 14. Ng3 g6 15. Bg5 h6 16. Bd2 c5 17. d5 c4 18. Nh2 Bg7 19. f4 exf4 20. Bxf4 Ne5 21. Qd2 Kh7 22. Re2 Nfd7 23. Rf1 f6 24. Ref2 Qb6 25. Be3 Qc7 26. Ne2 Bc8 27. Nf3 Nf7 28. Nfd4 Nc5 29. Ng3 Ne5 30. Nde2 Ncd3 31. Bxd3 Nxd3 32. Rf3 Qe7 33. Bd4 Rf8 34. Nf4 Ne5 35. R3f2 Bd7 36. Qe3 Rab8 37. Nge2 Qe8 38. Nc1 h5 39. Bb6 Rb7 40. Ba5 Bh6 41. Qe2 Bc8 42. Bb4 Qd8 43. b3 Qb6 44. Kh1 Rc7 45. a4 a5 46. Ba3 b4 47. Bb2 bxc3 48. Bxc3 cxb3 49. Qe1 Bxf4 50. Rxf4 b2 51. Ne2 Nd3 52. Qb1 Nxf4 53. Bd4 Qa6 0-1

[Event "DDR-Cup5 sf08 corr"]
[Site "DDR"]
[Date "1977.??.??"]
[Round "?"]
[White "Lewandowitz, Detlef"]
[Black "Unterdoerfer, Edgar"]
[Result "1-0"]
[ECO "C95"]
[PlyCount "115"]
[EventDate "1977.??.??"]
[EventType "tourn (corr)"]
[EventRounds "10"]
[EventCountry "DDR"]
[SourceTitle "Corr Nr. 1"]
[Source "ChessBase"]
[SourceDate "1997.09.01"]
[SourceVersion "2"]
[SourceVersionDate "2000.04.19"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. 0-0 Be7 6. Re1 b5 7. Bb3 d6 8. c3 0-0 9. h3 Nb8 10. d4 Nbd7 11. Nbd2 Bb7 12. Bc2 Re8 13. Nf1 Bf8 14. Ng3 g6 15. a4 c5 16. Be3 Qc7 17. Qd2 cxd4 18. cxd4 Nb6 19. Bg5 Bg7 20. b3 Rac8 21. Rec1 Nbd7 22. Bd3 Qb6 23. dxe5 dxe5 24. Be3 Qd6 25. axb5 axb5 26. Bxb5 Qxd2 27. Nxd2 Rxc1+ 28. Rxc1 Rc8 29. Rxc8+ Bxc8 30. Nc4 Ne8 31. Ne2 Nc7 32. Ba4 Nb8 33. Nc3 Be6 34. Nb6 Bf8 35. Ncd5 Nba6 36. Bg5 Bc5 37. Nf6+ Kg7 38. Nbd7 Bd4 39. Bd2 h5 40. Ba5 Bb2 41. b4 Bc4 42. Nb6 Bd3 43. Nfd5 Ne6 44. f3 Bd4+ 45. Kh2 f5 46. exf5 gxf5 47. Bb3 e4 48. fxe4 Be5+ 49. Kh1 fxe4 50. Bc4 Nd4 51. Bxd3 exd3 52. Nc4 Bg3 53. Bb6 Nb5 54. Be3 Kf7 55. Bd2 Ke6 56. Nde3 Bf4 57. Kg1 Nd6 58. Nxd6 1-0

[Event "DDR-Cup5 sf08 corr"]
[Site "DDR"]
[Date "1977.??.??"]
[Round "?"]
[White "Wetzel, Helmut"]
[Black "Unterdoerfer, Edgar"]
[Result "1/2-1/2"]
[ECO "E74"]
[PlyCount "122"]
[EventDate "1977.??.??"]
[EventType "tourn (corr)"]
[EventRounds "10"]
[EventCountry "DDR"]
[SourceTitle "Corr Nr. 1"]
[Source "ChessBase"]
[SourceDate "1997.09.01"]
[SourceVersion "2"]
[SourceVersionDate "2000.04.19"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Be2 0-0 6. Bg5 c5 7. d5 h6 8. Bh4 a6 9. a4 Qa5 10. Qd2 Kh7 11. Nf3 e6 12. 0-0 e5 13. h3 Nh5 14. Qe3 f5 15. exf5 Rxf5 16. g4 Rxf3 17. Bxf3 Nf4 18. Kh2 g5 19. Bg3 Nd7 20. Ne4 Qc7 21. Rh1 Nf8 22. h4 Qe7 23. Kg1 Kg8 24. hxg5 hxg5 25. Bd1 N8g6 26. Qb3 a5 27. f3 Qd8 28. Qc2 Qe7 29. Ra2 Bd7 30. b3 Kf7 31. Rh7 Rg8 32. Qh2 Ke8 33. Bc2 Kd8 34. Bd1 b6 35. Qh1 Kc7 36. Rah2 Nf8 37. Rxg7 Rxg7 38. Rh6 Rh7 39. Nxg5 Qxg5 40. Rxh7 Nxh7 41. Qxh7 Qg6 42. Qxg6 Nxg6 43. Kh2 Kd8 44. Bc2 Be8 45. Kh3 Ke7 46. Bh4+ Nxh4 47. Kxh4 Kf6 48. g5+ Kg7 49. Kg4 Bd7+ 50. Kh4 Be8 51. Bd3 Bd7 52. Kh5 Be8+ 53. g6 Bd7 54. Kg5 Bh3 55. Bf5 Bf1 56. Be4 Bg2 57. Kg4 Bf1 58. Kg3 Kf6 59. Bc2 Kg7 60. Bf5 Be2 61. Bc2 Bf1 1/2-1/2

[Event "DDR-ch H112 corr"]
[Site "DDR"]
[Date "1972.??.??"]
[Round "?"]
[White "Hessmer, Dietrich"]
[Black "Unterdoerfer, Edgar"]
[Result "1-0"]
[ECO "C12"]
[PlyCount "55"]
[EventDate "1972.??.??"]
[EventType "tourn (corr)"]
[EventRounds "10"]
[EventCountry "DDR"]
[SourceTitle "Corr Nr. 1"]
[Source "ChessBase"]
[SourceDate "1997.09.01"]
[SourceVersion "2"]
[SourceVersionDate "2000.04.19"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. Bg5 Bb4 5. e5 h6 6. Bd2 Bxc3 7. bxc3 Ne4 8. Qg4 Kf8 9. Bd3 Nxd2 10. Kxd2 f5 11. exf6 Qxf6 12. f4 Nc6 13. Nf3 e5 14. fxe5 Bxg4 15. exf6 gxf6 16. Nh4 Kg7 17. h3 Bd7 18. Raf1 Rae8 19. Rf3 Ne7 20. Rhf1 Ref8 21. Re1 Re8 22. Rfe3 Nc6 23. Rg3+ Kf8 24. Ng6+ Kf7 25. Nxh8+ Rxh8 26. Bg6+ Kf8 27. Rf1 Ke7 28. Re3+ 1-0

[Event "DDR-corr 2.PZ/12"]
[Site "DDR corr"]
[Date "1971.??.??"]
[Round "?"]
[White "Unterdoerfer, Edgar"]
[Black "Mueller, Rolf Dieter"]
[Result "0-1"]
[ECO "C05"]
[PlyCount "62"]
[EventDate "1984.??.??"]
[EventType "tourn (corr)"]
[EventCountry "DDR"]
[SourceTitle "Corr 2022"]
[Source "ChessBase"]
[SourceDate "2021.10.24"]
[SourceVersion "1"]
[SourceVersionDate "2021.10.24"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. Nd2 Nf6 4. e5 Nfd7 5. f4 c5 6. c3 Nc6 7. Ndf3 cxd4 8. cxd4 Nb6 9. Bd3 h5 10. Ne2 Bd7 11. 0-0 Be7 12. a3 Rc8 13. Rb1 a6 14. Ng5 Bxg5 15. fxg5 g6 16. Nf4 Ne7 17. g4 hxg4 18. Qxg4 Nf5 19. Ng2 Ba4 20. b3 Rc3 21. Qf3 Rxd3 22. Qxd3 Bb5 23. Qf3 Bxf1 24. Qxf1 Nxd4 25. Qf6 Qxf6 26. gxf6 Nf3+ 27. Kf2 Nxe5 28. h4 Nd3+ 29. Kg3 Nxc1 30. Rxc1 Kd7 31. Rd1 Rc8 0-1

[Event "DDR corr"]
[Site "DDR"]
[Date "1969.??.??"]
[Round "?"]
[White "Unterdoerfer, Edgar"]
[Black "Bluemel, E."]
[Result "1-0"]
[ECO "B86"]
[PlyCount "39"]
[EventDate "1969.??.??"]
[EventType "tourn (corr)"]
[EventRounds "10"]
[EventCountry "DDR"]
[SourceTitle "Corr Nr. 1"]
[Source "ChessBase"]
[SourceDate "1997.09.01"]
[SourceVersion "2"]
[SourceVersionDate "2000.04.19"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Bc4 e6 7. Bb3 Be7 8. f4 0-0 9. Qf3 Qc7 10. g4 b5 11. g5 Ne8 12. Rg1 b4 13. Nce2 Bb7 14. g6 hxg6 15. Qh3 d5 16. f5 gxf5 17. exf5 exf5 18. Nf3 Nd7 19. Bh6 Bf6 20. 0-0-0 1-0

[Event "DDR corr H/67"]
[Site "DDR corr"]
[Date "1969.??.??"]
[Round "?"]
[White "Wesphal"]
[Black "Unterdoerfer, Edgar"]
[Result "1-0"]
[ECO "D92"]
[PlyCount "77"]
[EventDate "1984.??.??"]
[EventType "tourn (corr)"]
[EventCountry "DDR"]
[SourceTitle "Corr 2022"]
[Source "ChessBase"]
[SourceDate "2021.10.24"]
[SourceVersion "1"]
[SourceVersionDate "2021.10.24"]
[SourceQuality "1"]

1. c4 Nf6 2. Nf3 g6 3. Nc3 d5 4. d4 Bg7 5. Bf4 0-0 6. Rc1 c6 7. b3 Bf5 8. h3 Nbd7 9. e3 Ne4 10. Nxe4 Bxe4 11. Nd2 Qa5 12. f3 Bf5 13. cxd5 cxd5 14. Bc7 Qxa2 15. g4 Be6 16. Nb1 b5 17. Nc3 Qa6 18. Nxb5 Qb7 19. Ba5 Qa6 20. Ra1 Rac8 21. Rh2 Qb7 22. Rha2 a6 23. Nc3 f5 24. f4 h6 25. Bd3 Nb8 26. Na4 Nd7 27. Rf2 Kh7 28. Bd2 Bh8 29. h4 Rb8 30. Rb1 Rbc8 31. g5 h5 32. Ba5 Bf7 33. b4 Qc6 34. Nc5 Nxc5 35. bxc5 Rb8 36. Rfb2 Rxb2 37. Rxb2 Qe6 38. Kf2 Rc8 39. Rb6 1-0

[Event "DDR-corr H/48"]
[Site "DDR corr"]
[Date "1967.??.??"]
[Round "?"]
[White "Mittag"]
[Black "Unterdoerfer, Edgar"]
[Result "1-0"]
[ECO "C04"]
[PlyCount "75"]
[EventDate "1984.??.??"]
[EventType "tourn (corr)"]
[EventCountry "DDR"]
[SourceTitle "Corr 2022"]
[Source "ChessBase"]
[SourceDate "2021.10.24"]
[SourceVersion "1"]
[SourceVersionDate "2021.10.24"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. Nd2 Nc6 4. Ngf3 Nf6 5. e5 Nd7 6. Nb3 f6 7. Bb5 Be7 8. exf6 Bxf6 9. Bf4 0-0 10. 0-0 a6 11. Bd3 Nb4 12. Re1 Nxd3 13. Qxd3 Nb6 14. Nc5 Be7 15. Bd2 Nc4 16. Bc3 Rf6 17. Ng5 Rh6 18. Nf3 b6 19. Nb3 Bd7 20. Qe2 Bd6 21. Bd2 Nxd2 22. Nbxd2 Bf4 23. g3 Bb5 24. Qd1 Bd6 25. Ne5 Bxe5 26. Rxe5 Qf6 27. f4 c5 28. dxc5 bxc5 29. Nf3 Be8 30. Ng5 Bh5 31. Qd2 Bg4 32. Rae1 Rh5 33. Rxd5 Re8 34. c3 h6 35. Ne4 Qf8 36. Rd6 Rd5 37. Rxd5 exd5 38. Qxd5+ 1-0

