[Event "Groningen SO ON Mini op-C"]
[Site "Groningen"]
[Date "2000.??.??"]
[Round "4"]
[White "Ridderbos, Bert"]
[Black "Brand, Matthias"]
[Result "1-0"]
[ECO "E85"]
[PlyCount "39"]
[EventDate "2000.12.??"]
[EventType "swiss"]
[EventRounds "5"]
[EventCountry "NED"]
[SourceTitle "EXT 2002"]
[Source "ChessBase"]
[SourceDate "2001.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2001.11.25"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. f3 0-0 6. Be3 Nbd7 7. Qd2 e5 8. Nge2 Ne8 9. Ng3 c6 10. d5 c5 11. Bd3 Nb6 12. h4 h5 13. 0-0-0 Bd7 14. Rdg1 Kh7 15. Nge2 f5 16. exf5 Bxf5 17. g4 Bxd3 18. Qxd3 Bh6 19. Bxh6 Kxh6 20. gxh5 1-0

[Event "Groningen ABM op"]
[Site "Groningen"]
[Date "1999.??.??"]
[Round "?"]
[White "Ridderbos, Bert"]
[Black "Hardeman, Martijn"]
[Result "0-1"]
[ECO "A52"]
[PlyCount "38"]
[EventDate "1999.??.??"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2003"]
[Source "ChessBase"]
[SourceDate "2002.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2002.11.25"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 e5 3. dxe5 Ng4 4. Nf3 Bc5 5. e3 Nc6 6. e6 fxe6 7. a3 a5 8. Nd4 Nf6 9. Nxc6 bxc6 10. Bd3 d5 11. Bd2 0-0 12. Bc3 Qd6 13. Nd2 e5 14. b4 axb4 15. axb4 Bxb4 16. Rxa8 Bxc3 17. Qb3 Bxd2+ 18. Kxd2 e4 19. Be2 dxc4+ 0-1

