Author: Uri Blass
Date: 04:17:19 10/11/00
[D]r2r2k1/pp2nq2/3b3p/2p1p2Q/2P1B3/P2PB3/1P2KP2/R7 w - - 0 1
Can your favourite mate finder find a forced mate here?
I will be surprised if a commercial program can find a forced mate even after 24
hours and I think that a special mate finder is needed to prove a forced mate.
A team of human(me) and chessmaster6000(ss=10) could find a forced mate after
some hours.
Chessmaster needed some hours to find the mate in 17 with 29.Bh6(I did not try
it for a long time in the position before 27.Qxh6 that is posted here)
Here is the game with some analysis of chessmaster6000(including some of the
main lines of chessmaster when it showed mate scores)
[Event "Blitz:60'"]
[Site "Nottingham"]
[Date "2000.10.07"]
[Round "4"]
[White "Tiger 0.95 Gambit Beta"]
[Black "Crafty 17.10 Chessbase version"]
[Result "1-0"]
[ECO "B50"]
[Annotator "0.16"]
[PlyCount "84"]
[EventDate "2000.09.18"]
{128MB, General.ctg. Celeron 500} 1. e4 {0} 1... c5 {0} 2. Nf3 {0} 2... d6 {0}
3. Nc3 {0} 3... Nf6 {0} 4. g3 {0} 4... Nc6 {0} 5. Bg2 {0} 5... e6 {0} 6. O-O {0
} 6... Be7 {0} 7. d3 {0} 7... O-O {0} 8. Bf4 {1} 8... e5 {
last book move 0.16/12 104} 9. Be3 {72} 9... Be6 {0.12/11 100} 10. a3 {75}
10... h6 {0.04/11 194} 11. h3 {119} 11... Qd7 {-0.21/11 92} 12. g4 {55} 12...
d5 {-0.24/12 89} 13. exd5 {276} 13... Nxd5 {-0.28/13 0} 14. Nxd5 {77} 14...
Bxd5 {-0.30/12 87} 15. c4 {184} 15... Be6 {-0.47/12 84} 16. Nh2 {55} 16... Rfd8
{-0.78/11 114} 17. Be4 {103} 17... f5 {-0.60/12 0} 18. gxf5 {42} 18... Bxf5 {
-0.68/12 36} 19. Qf3 {79} 19... Bxh3 {-0.99/11 84} 20. Qh5 {44} 20... Bxf1 {
-1.86/10 99} 21. Kxf1 {0} 21... Qe8 {-1.96/10 76} 22. Bg6 {285} 22... Qf8 {
-1.69/12 70} 23. Ng4 {80} 23... Bd6 {-1.51/11 1} (23... Rd6 24. Bxc5 {
-0.40/16 286} (24. Nxh6+ gxh6 25. Bxh6) (24. Bxh6 gxh6 25. Nxh6+ Kg7 26. Nf5+
Kf6 27. Nxd6 Bxd6 28. Be4) (24. Be4) (24. Re1) 24... Rdd8 (24... Rd7) (24...
Re6) (24... Rxg6 25. Qxg6 Bxc5 26. Nxh6+ Kh8 27. Nf7+ Kg8)) 24. Be4 {67} (24.
Nxh6+ gxh6) (24. Bxh6 gxh6 25. Nxh6+ Kg7 26. Be4 Ne7 27. Qg5+ Kh8 28. Ke2 Qg7
29. Qh4 Ng6 30. Bxg6 Qxg6 31. Nf7+ Kg8 32. Nxd8) 24... Ne7 {0.89/11 339} (24...
Rd7) (24... Nd4 {1.80/19 4604} 25. Nxh6+ {0} 25... gxh6 26. Bxh6 Qf7 27. Bd5
Ne6 28. Bxe6 Qxe6 29. Ke2 Qxh6 30. Qxh6 Kf7 31. Rg1 Bf8 {6.83/14 100}) 25.
Nxh6+ {39} 25... gxh6 {2.41/12 19} 26. Ke2 {95} 26... Qf7 {3.44/12 250} (26...
Kg7 {Chessmaster did not find forced mate after this move 0}) 27. Qxh6 {143}
27... Qg7 {4.21/11 0} (27... Nf5 28. Rg1+ {
chessmaster6000 mate in 16 depth 1/11} 28... Ng7 29. Bd5 Bf8 30. Bxf7+ Kxf7 31.
Qg6+ Ke7 32. Bxc5+ Kd7 33. Qf7+ Kc8 34. Bd6 Ne8 35. Qe6+ Rd7 36. Qxe8+ Rd8 37.
Qe6+ Rd7 38. Rg8 b6 39. Rxf8+ Kb7 40. Qxd7+ Ka6 41. Qb5+ Kb7) (27... Qxf2+ 28.
Bxf2 {chessmaster6000 mate in 9 depth 1/11} 28... Kf7 29. Bd5+ Nxd5 30. cxd5
Rg8 31. Qe6+ Kf8 32. Rh1 Rh8 33. Rxh8+ Kg7 34. Qh6+ Kf7 35. Qh7+ Kf6 36. Bh4#)
(27... Qxc4 28. dxc4 {chessmaster6000 mate in 9 depth 1/11} 28... Kf7 29. Bd5+
Ke8 30. Be6 Rd7 31. Qh8+ Ng8 32. Bg5 Rg7 33. Qxg7 Ne7 34. Qh8+ Ng8 35. Qxg8+
Bf8 36. Qf7#) (27... Ng6 28. Bd5 {chessmaster6000 mate in 8 depth 2/12} 28...
Rd7 29. Rg1 Qxd5 30. Qxg6+ Kf8 31. cxd5 Ke7 32. Bg5+ Kf8 33. Rh1 Rg7 34. Rh8+
Rg8 35. Qxg8#) (27... Rd7 28. Rg1+ {chessmaster6000 mate in 8 similiar line}
28... Ng6 29. Bd5) 28. Qe6+ {66} 28... Kf8 {5.43/11 9} (28... Qf7 29. Rg1+ {
chessmaster6000 mate in 13} 29... Kf8 30. Bh6+ Ke8 31. Bg6 Rd7 32. Bxf7+ Kd8
33. Be8 Kc7 34. Qxd7+ Kb6 35. Qxd6+ Nc6 36. Bxc6 bxc6 37. Rg7 Rc8 38. Qd7 Ra8
39. Qc7+ Ka6 40. Qxc6+ Ka5 41. Qb5#) 29. Bh6 {
36 chessmaser6000 mate in 17 depth 3/13} 29... Qxh6 {6.87/11 57} 30. Qxh6+ {
Resigns 7} 30... Kf7 31. Bd5+ Ke8 32. Be6 Rd7 33. Qh8+ Ng8 34. Rg1 Ke7 35. Rg6
Kd8 36. Rxg8+ Kc7 37. Rxa8 a6 38. Bxd7 Bf8 39. Qxe5+ Kxd7 40. Qe8+ Kd6 41.
Qxf8+ Ke6 42. Re8+ Kd7 1-0
Uri
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