[Event "Nathanya-11 Open"]
[Site "Nathanya"]
[Date "1973.06.10"]
[Round "11"]
[White "Bobis, Leonid"]
[Black "Onn, S."]
[Result "0-1"]
[ECO "B78"]
[PlyCount "80"]
[EventDate "1973.05.30"]
[EventType "swiss"]
[EventRounds "11"]
[EventCountry "ISR"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 g6 6. Be3 Bg7 7. Bc4 0-0 8. f3 Nc6 9. Qd2 Bd7 10. 0-0-0 Ne5 11. Bb3 Qa5 12. h4 h5 13. Bh6 Rac8 14. Kb1 Nc4 15. Bxc4 Rxc4 16. Bxg7 Kxg7 17. Nb3 Qc7 18. g4 Be6 19. gxh5 Nxh5 20. Rdg1 Rc8 21. Nd4 Qa5 22. Nb3 Qe5 23. Rg5 Qf4 24. Qf2 b6 25. Nd4 Qf6 26. e5 dxe5 27. Ne4 Qf4 28. Nxe6+ fxe6 29. c3 Rxe4 30. Qg2 Re3 31. Rg1 Qxf3 32. Rxg6+ Kf7 33. Rf1 Qxf1+ 34. Qxf1+ Kxg6 35. Qg2+ Rg3 36. Qe4+ Kf6 37. Qh7 Nf4 38. h5 Rcg8 39. Qh6+ Kf7 40. Qh7+ R8g7 0-1

[Event "Nathanya-11 Open"]
[Site "Nathanya"]
[Date "1973.06.09"]
[Round "10"]
[White "Onn, S."]
[Black "Gross, Ernst"]
[Result "0-1"]
[ECO "B00"]
[PlyCount "28"]
[EventDate "1973.05.30"]
[EventType "swiss"]
[EventRounds "11"]
[EventCountry "ISR"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. e4 b6 2. d4 Bb7 3. Nc3 e6 4. a3 Nf6 5. f3 d5 6. Bg5 h6 7. Bxf6 Qxf6 8. exd5 exd5 9. Bb5+ c6 10. Qe2+ Kd8 11. Bd3 Qxd4 12. Qd2 Bc5 13. 0-0-0 Qe3 14. Nh3 Re8 0-1

[Event "Nathanya-11 Open"]
[Site "Nathanya"]
[Date "1973.06.08"]
[Round "9"]
[White "Onn, S."]
[Black "Glusman, K."]
[Result "0-1"]
[ECO "B73"]
[PlyCount "56"]
[EventDate "1973.05.30"]
[EventType "swiss"]
[EventRounds "11"]
[EventCountry "ISR"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 g6 6. Be2 Bg7 7. Be3 0-0 8. 0-0 Nc6 9. h3 d5 10. exd5 Nb4 11. Qd2 Nbxd5 12. Nxd5 Nxd5 13. Bh6 Qb6 14. Bxg7 Kxg7 15. Nb3 Rd8 16. Bf3 Nf6 17. Qe2 Be6 18. Rfd1 a5 19. Rxd8 Rxd8 20. c3 Qc7 21. Qb5 b6 22. Nd4 Bd7 23. Qe2 e5 24. Nb3 Be6 25. Nd2 a4 26. c4 Qc5 27. Bb7 Rd7 28. Ba6 Qa5 0-1

[Event "Nathanya-11 Open"]
[Site "Nathanya"]
[Date "1973.06.07"]
[Round "8"]
[White "Chessakov, Zelig"]
[Black "Onn, S."]
[Result "1-0"]
[ECO "C00"]
[PlyCount "81"]
[EventDate "1973.05.30"]
[EventType "swiss"]
[EventRounds "11"]
[EventCountry "ISR"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. Nf3 Nf6 2. g3 d5 3. Bg2 e6 4. 0-0 Be7 5. d3 0-0 6. Nbd2 c5 7. e4 Nc6 8. e5 Nd7 9. Re1 Qc7 10. Qe2 b5 11. Nf1 a5 12. h4 Ba6 13. Bf4 Rac8 14. N1h2 Nd4 15. Nxd4 cxd4 16. Rac1 Qa7 17. Qg4 Kh8 18. Nf3 Nb8 19. Ng5 Bxg5 20. hxg5 Qe7 21. Bf3 g6 22. Qh3 Rg8 23. Kg2 b4 24. Rh1 Rg7 25. b3 Bb7 26. Rh2 Nd7 27. Rch1 Nf8 28. Bd1 Ba6 29. Qg4 Kg8 30. Bd2 Qc5 31. Rh4 Nd7 32. Re1 Nb8 33. Qxd4 Qxd4 34. Rxd4 Nc6 35. Rh4 Bb5 36. Bc1 Ne7 37. Bb2 Nc6 38. Bc1 Kh8 39. Be3 Nxe5 40. Bd4 Nc6 41. Bf6 1-0

[Event "Nathanya-11 Open"]
[Site "Nathanya"]
[Date "1973.06.06"]
[Round "7"]
[White "Onn, S."]
[Black "Onat, Ilhan"]
[Result "1/2-1/2"]
[ECO "B13"]
[PlyCount "49"]
[EventDate "1973.05.30"]
[EventType "swiss"]
[EventRounds "11"]
[EventCountry "ISR"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. e4 c6 2. d4 d5 3. exd5 cxd5 4. Bd3 Nc6 5. c3 Nf6 6. Nf3 Bg4 7. h3 Bxf3 8. Qxf3 e6 9. Nd2 Be7 10. Qe2 0-0 11. Nf3 Re8 12. Bf4 Rc8 13. 0-0 a6 14. a4 g6 15. Ne5 Nxe5 16. dxe5 Nd7 17. a5 Rc5 18. Rac1 Rxa5 19. b4 Ra4 20. Rb1 Bg5 21. Bxg5 Qxg5 22. f4 Qe7 23. Qb2 Nb6 24. Qb3 Rc8 25. Kh1 1/2-1/2

[Event "Nathanya-11 Open"]
[Site "Nathanya"]
[Date "1973.06.04"]
[Round "6"]
[White "Malachi, Avraham"]
[Black "Onn, S."]
[Result "1-0"]
[ECO "B77"]
[PlyCount "89"]
[EventDate "1973.05.30"]
[EventType "swiss"]
[EventRounds "11"]
[EventCountry "ISR"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 g6 5. Nc3 Bg7 6. Be3 d6 7. Bc4 Nf6 8. f3 0-0 9. Qd2 a6 10. 0-0-0 Ne5 11. Bb3 b5 12. Bh6 Nc4 13. Qg5 Qb6 14. h4 Bxh6 15. Qxh6 e5 16. h5 Ra7 17. Nf5 Bxf5 18. exf5 Qe3+ 19. Qxe3 Nxe3 20. Rxd6 Ne8 21. Rc6 gxf5 22. Rc5 Re7 23. Re1 f4 24. Nd5 Nxd5 25. Rxd5 Kg7 26. Rdxe5 Rxe5 27. Rxe5 Kf6 28. Rc5 Ng7 29. Rc6+ Ne6 30. Rxa6 Rg8 31. a4 bxa4 32. Rxa4 Kf5 33. Ra7 Kf6 34. Bxe6 fxe6 35. b4 Rxg2 36. b5 Rg5 37. c4 Rc5 38. Ra4 Ke7 39. b6 Kd7 40. b7 Kc7 41. Rb4 Kb8 42. h6 Rc6 43. Kd2 Rd6+ 44. Kc3 Rd7 45. Rb5 1-0

[Event "Nathanya-11 Open"]
[Site "Nathanya"]
[Date "1973.06.03"]
[Round "5"]
[White "Onn, S."]
[Black "Cnaan, Moshe"]
[Result "0-1"]
[ECO "C55"]
[PlyCount "70"]
[EventDate "1973.05.30"]
[EventType "swiss"]
[EventRounds "11"]
[EventCountry "ISR"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nf6 3. Nc3 Nc6 4. Bc4 Nxe4 5. Nxe4 d5 6. Bd3 dxe4 7. Bxe4 Bd6 8. Bxc6+ bxc6 9. d4 e4 10. Ng5 0-0 11. Be3 Qe7 12. Qh5 Bf5 13. h4 Rab8 14. b3 Bb4+ 15. Kf1 Bc3 16. Rd1 f6 17. Nh3 Qd7 18. Qe2 Bg4 19. Qc4+ Kh8 20. Rb1 Bb4 21. Nf4 Bd6 22. h5 Bxf4 23. Bxf4 h6 24. a4 Rfd8 25. Be3 f5 26. Qc5 a6 27. Ke1 Qf7 28. g3 Bf3 29. Rh2 Qe6 30. c4 Rb7 31. Kd2 Rdb8 32. Kc3 Be2 33. Rhh1 Bd3 34. Rb2 a5 35. Bf4 Qd7 0-1

[Event "Nathanya-11 Open"]
[Site "Nathanya"]
[Date "1973.06.02"]
[Round "4"]
[White "Onn, S."]
[Black "Agur, Elieser"]
[Result "0-1"]
[ECO "B06"]
[PlyCount "52"]
[EventDate "1973.05.30"]
[EventType "swiss"]
[EventRounds "11"]
[EventCountry "ISR"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. e4 Nc6 2. Nf3 d6 3. d4 g6 4. c3 Bg7 5. Bd3 Nf6 6. h3 0-0 7. Be3 Nd7 8. Qd2 e5 9. d5 Ne7 10. g4 Qe8 11. Bc2 a6 12. Na3 Kh8 13. 0-0-0 b5 14. h4 Nf6 15. Nh2 Nxg4 16. h5 Nxe3 17. Qxe3 h6 18. hxg6 fxg6 19. Rdg1 Qf7 20. Ng4 h5 21. Bd1 Bxg4 22. Rxg4 Ng8 23. Rg5 Bh6 24. Bxh5 gxh5 25. Rxg8+ Kxg8 26. Qxh6 Qf4+ 0-1

[Event "Nathanya-11 Open"]
[Site "Nathanya"]
[Date "1973.06.01"]
[Round "3"]
[White "Onn, S."]
[Black "Scheinwald, Chagai"]
[Result "0-1"]
[ECO "B39"]
[PlyCount "80"]
[EventDate "1973.05.30"]
[EventType "swiss"]
[EventRounds "11"]
[EventCountry "ISR"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 g6 5. c4 Bg7 6. Be3 Nf6 7. Nc3 Ng4 8. Qxg4 Nxd4 9. Qd1 e5 10. Nb5 0-0 11. Qd2 Qh4 12. Bd3 d5 13. Bg5 Qg4 14. f3 Qd7 15. Nxd4 dxe4 16. Bxe4 Qxd4 17. Qxd4 exd4 18. 0-0 Bd7 19. Rad1 Rac8 20. Bd3 Rfe8 21. Rfe1 Rxe1+ 22. Rxe1 Be6 23. b3 Kf8 24. Kf2 a6 25. Bf4 Ke7 26. Be5 Bxe5 27. Rxe5 Kd6 28. f4 b6 29. Ke1 Rc5 30. Re2 Ra5 31. Rb2 Ra3 32. Kd2 Kc5 33. Be4 a5 34. Bd3 Kb4 35. Be4 a4 36. Kc2 Rxa2 37. bxa4+ Rxb2+ 38. Kxb2 Bxc4 39. Bc6 Bb3 40. Be8 d3 0-1

[Event "Nathanya-11 Open"]
[Site "Nathanya"]
[Date "1973.05.31"]
[Round "2"]
[White "Rosenberg, Arie"]
[Black "Onn, S."]
[Result "1-0"]
[ECO "A38"]
[PlyCount "79"]
[EventDate "1973.05.30"]
[EventType "swiss"]
[EventRounds "11"]
[EventCountry "ISR"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. c4 c5 2. Nc3 g6 3. g3 Bg7 4. Bg2 Nf6 5. Nf3 d5 6. cxd5 Nxd5 7. 0-0 0-0 8. Nxd5 Qxd5 9. d3 Nc6 10. Nd2 Qd7 11. Nc4 b6 12. Be3 Bb7 13. Qa4 Rfd8 14. Rfe1 e5 15. a3 h6 16. Rab1 Nd4 17. Qxd7 Rxd7 18. Bxd4 exd4 19. Bxb7 Rxb7 20. b4 cxb4 21. Rxb4 Bf8 22. Rb5 Bc5 23. Reb1 Re7 24. Kf1 Rae8 25. R5b2 f5 26. a4 Kg7 27. Rc2 g5 28. Na5 Rd7 29. Rc4 Be7 30. Nc6 Bf6 31. Rb5 Kg6 32. Rbb4 f4 33. gxf4 gxf4 34. Nxd4 Rde7 35. Rc6 Kg5 36. Rb5+ Kg6 37. Rd5 Re5 38. Rdd6 Rf8 39. Ne6 Rf7 40. Nxf4+ 1-0

[Event "Nathanya-11 Open"]
[Site "Nathanya"]
[Date "1973.05.30"]
[Round "1"]
[White "Avner, Uri"]
[Black "Onn, S."]
[Result "1-0"]
[ECO "D60"]
[PlyCount "107"]
[EventDate "1973.05.30"]
[EventType "swiss"]
[EventRounds "11"]
[EventCountry "ISR"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Be7 5. e3 0-0 6. cxd5 Nxd5 7. Bxe7 Qxe7 8. Nf3 Nxc3 9. bxc3 b6 10. Bd3 Bb7 11. 0-0 Nd7 12. Qc2 h6 13. Be4 Bxe4 14. Qxe4 c5 15. Rfd1 cxd4 16. cxd4 Nf6 17. Qd3 Rac8 18. a4 Rc7 19. a5 bxa5 20. Rxa5 Rfc8 21. Raa1 Rc2 22. Ne1 R2c3 23. Qa6 R8c7 24. Nd3 Ne4 25. Qa5 Qh4 26. f3 Rxd3 27. Qxc7 Qf2+ 28. Kh1 Rxd1+ 29. Rxd1 Qe2 30. Qb8+ Kh7 31. Ra1 Nf2+ 32. Kg1 Qxe3 33. Qb1+ Nd3+ 34. Kh1 g6 35. h3 Nf2+ 36. Kh2 Qf4+ 37. Kg1 Qxd4 38. Kh2 Qf4+ 39. Kg1 Qe3 40. Kh2 Nd3 41. Ra2 Nc1 42. Ra4 Ne2 43. Qf1 Qe5+ 44. f4 Qe3 45. Qe1 h5 46. Ra2 Qxf4+ 47. g3 Nxg3 48. Qxg3 Qb4 49. Rf2 Qb7 50. Qf4 Kg8 51. Rd2 Qb6 52. Qe5 a5 53. Rb2 f6 54. Rxb6 1-0

