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Subject: Re: interresting mate + bug in RebelXP ????

Author: John Merlino

Date: 14:23:23 08/10/02

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On August 10, 2002 at 04:53:13, Vincent Lejeune wrote:

>after 42. a7 in the following game:
>[d]8/P5k1/7p/3p4/8/6PP/2p1nP1K/8 b - -
>
>here RebelXp anlysis window show : c1=Q Kg2 cxa3 a8=Q axa8 Kf1 axa2 ???????
>it's the first bug I found in this engine and i'm disapointed :'(
>after playing c1=Q and Kg2 RebelXP find the mate pretty quicky ...
>
>in fact it's mate in 12, tiger is very fast to find it, fritz 7 have some
>problems ...
>
>[Event "Partie sérieuse, 3m + 0s"]
>[Site "Grande salle de jeu"]
>[Date "2002.08.10"]
>[Round "?"]
>[White "elbe-biber"]
>[Black "Vinvin"]
>[Result "0-1"]
>[ECO "D02"]
>[WhiteElo "2272"]
>[BlackElo "2114"]
>[PlyCount "86"]
>[EventDate "2002.??.??"]
>
>1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 c5 5. Bd3 d5 6. Nf3 O-O 7. O-O Nbd7 8. a3
>Bxc3 9. bxc3 b6 10. a4 Ba6 11. cxd5 Bxd3 12. Qxd3 exd5 13. Ba3 Re8 14. Rad1 Rb8
>15. Rfe1 Qc7 16. h3 Qc6 17. a5 c4 18. Qf5 b5 19. Ne5 Nxe5 20. dxe5 Ne4 21. Rd4
>Nxc3 22. Bd6 Rbd8 23. Rh4 h6 24. Rg4 Rxd6 25. exd6 Qxd6 26. Qh5 b4 27. Rf4 Qe7
>28. e4 b3 29. e5 b2 30. e6 Qxe6 31. Rxe6 b1=Q+ 32. Kh2 Rxe6 33. Qxf7+ Kh7 34.
>Qxe6 Qd3 35. Qd7 Qe2 36. Rg4 Qe5+ 37. g3 Ne2 38. Qxa7 c3 39. a6 c2 40. Rxg7+
>Qxg7 41. Qxg7+ Kxg7 42. a7 c1=Q 43. a8=Q Qg1# 0-1

Chessmaster 9000, on a PIII-733, says Mate in 10 in 19 seconds:

Time	Depth	Score	Positions	Moves
0:00	1/3	-12.72	1384		1...c1=Q 2.Kg2 Qa1 3.Kf3 Nd4+ 4.Ke3
					Qxa7
0:00	1/4	-12.72	3807		1...c1=Q 2.Kg2 Qa1 3.Kf3 Nd4+ 4.Ke3
					Qxa7
0:00	1/5	-12.81	11522		1...c1=Q 2.Kg2 Qa1 3.Kf3 Nc3 4.Ke3
					Qxa7+ 5.Kd3
0:01	2/6	-12.83	50137		1...c1=Q 2.Kg2 Qa1 3.Kf3 Nd4+ 4.Kg2
					Qa3 5.a8=Q Qxa8
0:02	3/7	-12.89	140393		1...c1=Q 2.Kg2 Qa1 3.Kf3 Nc3 4.Kg2
					Ne4 5.a8=Q Qxa8
0:06	4/8	-Mate11	498628		1...c1=Q 2.Kg2 Qg1+ 3.Kf3 Qd1 4.Ke3
					Nc1 5.f3 Nb3 6.Kf2 Nd4 7.Ke3 Nc2+
					8.Kf2 Qe1+ 9.Kg2 Ne3+ 10.Kh2 Qf2+
					11.Kh1 Qg2#
0:11	5/9	-Mate11	1061046		1...c1=Q 2.Kg2 Qg1+ 3.Kf3 Qd1 4.Ke3
					Nc1 5.f3 Nb3 6.Kf2 Nd4 7.Ke3 Nc2+
					8.Kf2 Qe1+ 9.Kg2 Ne3+ 10.Kh2 Qf2+
					11.Kh1 Qg2#
0:19	6/10	-Mate10	2060430		1...c1=Q 2.Kg2 Qg1+ 3.Kf3 Qd1 4.Ke3
					Nc1 5.f3 Qd3+ 6.Kf2 Qe2+ 7.Kg1
					Qxf3 8.a8=Q Ne2+ 9.Kh2 Qxg3+ 10.Kh1
					Qg1#
0:42	7/11	-Mate10	4814375		1...c1=Q 2.Kg2 Qg1+ 3.Kf3 Qd1 4.Ke3
					Nc1 5.f3 Qd3+ 6.Kf2 Qe2+ 7.Kg1
					Qxf3 8.a8=Q Ne2+ 9.Kh2 Qxg3+ 10.Kh1
					Qg1#

jm



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