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Topic started by IsraeliProgram on 27 May 2007, 17:11:33
Elite Member
United States
Posts: 7
27 May 2007, 17:11:33
error in three-fold repetition detector
On the classic caissa, I encountered an error in the three-fold repetition detector. A position occured twice with black to play. Then it occured again with white to play. The system offered a draw to my opponent which he accepted. The draw should not have been offered because it was not the same position because it was the other side to play.
White: toto (1583)
Black: IsraeliProgram (2828)
Type: Live
Time control: 30/15
Result: 1/2-1/2 (Draw agreed)
Opening: Bogo-Indian defense
Start time: 16:43:50 GMT
End time: 17:14:24 GMT
Duration: 0:30:34
Moves: 35

[Event "Live Game"]
[Site "Caissa's Web"]
[Date "2007.05.27"]
[White "toto"]
[Black "IsraeliProgram"]
[Result "1/2-1/2"]
[TimeControl "30/15"]
[WhiteElo "1583"]
[BlackElo "2828"]
[ECO "E11"]
[Opening "Bogo-Indian defense"]
1. Nf3 Nf6 2. d4 e6 3. c4 Bb4+ 4. Bd2 a5 5. g3 O-O 6. Bg2 b6 7. O-O
Ba6 8. Ne5 Ra7 9. Bg5 Be7 10. Nd2 d6 11. Nef3 Bb7 12. Qc2 Ng4 13.
Bxe7 Qxe7 14. e4 c5 15. h3 Nh6 16. Rfe1 e5 17. d5 f5 18. exf5 Nxf5
19. Ne4 Bc8 20. Qa4 Qd8 21. g4 Nd4 22. Nxd4 cxd4 23. Qa3 Rd7 24. Rf1
Rf4 25. Qd3 Na6 26. Rae1 Rdf7 27. f3 Nc5 28. Qd2 Ba6 29. b3 Rf8 30.
Qe2 a4 31. Rb1 Qc7 32. Ng5 Qd8 33. Ne4 Qc7 34. Ng5 Qe7 35. Ne4 Qd8
Founding Member
United Kingdom
Posts: 109
29 May 2007, 13:29:55
In reply to IsraeliProgram
Re: error in three-fold repetition detector
Another thing to check is whether it correctly treats positions as different if they differ only in respect of an en passant option or the potential ability to castle.