test position: Corrales Jiminez-Fedorchuk, 2011

[jdart]

[D] 1r3rk1/1bp2pp1/1bq2n1p/1R2R3/1p1P4/5N1P/1PB2PP1/2BQ2K1 w - - 0 22

This was published in the new periodical Chess Evolution. White played Be3, and lost, but Bxh6! is better.

1: Corrales Jimenez,F - Fedorchuk,S, Villa de Roquetas 2011
1r3rk1/1bp2pp1/1bq2n1p/1R2R3/1p1P4/5N1P/1PB2PP1/2BQ2K1 w - - 0 1

Analysis by Houdini 1.5a w32 _15a_w32 (depth 22):

1. +/- (0.87): 22.Bxh6 gxh6 23.Qd2 Nh7 24.Rh5 f5 25.Bb3+ Kg7 26.Re5 Rf6 27.Nh4 Re8 28.Qf4 Rxe5 29.Qxe5 Kh8 30.Rxf5 Qe4 31.Rxf6 Qxe5 32.Ng6+ Kg7 33.Rf7+ Kxg6 34.dxe5 Ng5 35.Rf6+ Kg7 36.Rf4 Ne4 37.h4 Nd2 38.Bd1 Ne4 39.Kf1 Nxf2 40.Rxf2 Bxf2 41.Kxf2 Kf7 42.Bf3

2. = (0.01): 22.Rxb4 Rfd8 23.Be3 Qd6 24.Rb3 Bxf3 25.Qxf3 Bxd4 26.Bxd4 Qxd4 27.Re1 Rxb3 28.Qxb3 Qc5 29.Ra1 Nd5 30.Qd3 g6 31.Bb3 Kg7 32.Qe4 Nf6 33.Qf4 Nd5 34.Bxd5

3. = (0.00): 22.Be3 Nd7 23.Rh5 Nf6 24.Rhe5 Nd7

[kgburcham]

also this one Jon
19.Bxh6
[D] 1rb2rk1/2p2pp1/1bq2n1p/nN2R3/1p1P4/5N1P/1PB2PP1/R1BQ2K1 w - -

[Event "Villa de Roquetas"]
[Site "Villa De Roquetas ESP"]
[Date "2011.01.06"]
[Round "8"]
[White "Corrales Jimenez, F."]
[Black "Fedorchuk, S."]
[WhiteElo "2591"]
[BlackElo "2650"]
[ECO "C78"]
[Result "0-1"]

1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O b5 6. Bb3
Bc5 7. a4 Rb8 8. c3 d6 9. d4 Bb6 10. axb5 axb5 11. h3 $5
(11. Na3) (11. Qd3) 11... O-O 12. Re1 h6 (12... Bb7)
13. Na3 exd4 14. cxd4 Na5 15. Bc2 b4 16. Nb5 d5 $6 $146
(16... Ba6 17. Na7 $5 Bb7 (17... Ra8 18. Rxa5 Rxa7 19. Ra4
Bb7 20. Rxb4 (20. Rxa7 Bxa7 21. d5 Re8 22. b3 c6 $11)
20... Re8 21. d5 (21. e5 dxe5 22. dxe5 Qxd1 23. Bxd1
Ra1 $44) 21... Ra1 22. Nd4 Qa8 23. Nb3 Ra2 24. Bd2 (24. Be3
Rxb2 25. Bxb6 cxb6 26. Qc1 Qa2 27. Bb1 Qa3 28. Rxb6 Rxb3
29. Qxa3 Rxa3 30. Rxb7 Nxd5 $11) (24. Bb1 Ra4 $13)
24... Qa7 25. Rxb6 (25. Be3) 25... Qxb6 26. Bc3 Bc8
27. Re3 $16) 18. d5 Ra8 $6 (18... Bxa7 $5 19. Rxa5 Bb6
20. Ra1 (20. Ra4 c6 21. e5 dxe5 22. d6 Bc5 23. Nxe5 Bxd6
24. Nc4 Bc7 $11) 20... c6 (20... Ra8 21. Rxa8 Qxa8 22. Be3
Bxe3 23. Rxe3 Re8 24. Nd4 $14) (20... Re8 21. Bf4 $1
(21. Be3 b3 22. Bd3 c6 $13) 21... Ra8 22. Rc1 $14) 21. dxc6
Bxc6 22. Nd4 (22. Bf4 Bc5 23. Nd4 Qb6 $13) 22... Bd7
23. Ne2 $5 (23. Bf4 Rc8 24. Bb3 (24. Nf5 Bxf5 25. exf5
d5 $11) 24... Re8 25. e5 (25. Qd3 Bc5 26. Rad1 Qb6)
25... dxe5 26. Bxe5) 23... Re8 24. Ng3 d5 $6 25. Bf4
(25. e5 Qc7 $1 $13) 25... b3 (25... Rc8 26. e5 $14) 26. Bb1
Bc7 (26... Ra8 27. Rxa8 Qxa8 28. e5 $14) 27. e5 g5 28. Nh5
Nxh5 29. Qxh5 gxf4 30. Qxh6 f5 31. Ra6 Rb6 32. Rxb6 Bxb6
33. e6 $16) 19. Nb5 $14 Nc4 (19... Re8 20. b3 Qd7 21. Nbd4
c6 22. Nf5 cxd5 23. exd5 Rxe1+ 24. Nxe1 $16) 20. Rxa8 Qxa8
21. Nbd4 Qa7 22. b3 Ne5 23. Bb2 Nxf3+ 24. gxf3 Qa2 25. Qc1
Bxd4 26. Bxd4 Nd7 27. Kh1 $1 $16 {Carlsen (2826)-Shirov
(2749) 2010}) (16... Re8 $5) 17. exd5 (17. e5 Ne4 18. Bd2
(18. Bxe4 dxe4 19. Nd2 f5 $1 (19... Qd7 20. Nxe4 Qxb5
21. Bxh6 $132) 20. exf6 Qxf6 21. Nxe4 Qf5 $19)
18... Qe7 $5 $13 19. Bxe4 dxe4 20. Rxe4 Rd8 21. Qe1 Nb3
22. Bxb4 Qe8 23. Ra3 Be6 $44) 17... Qxd5 (17... Ba6 18. Na7
Bb7 19. Bxh6 $1 (19. Nc6 Nxc6 20. dxc6 Bxc6 21. Ne5 Bb7
22. Be3 $13) 19... b3 (19... gxh6 20. Qd2 Kg7 21. Nh4 Rh8
(21... Nh7 22. Re7 $1 Ng5 23. Nf5+ Kh8 24. h4 Qxd5 25. Be4
Qxe4 26. Rxe4 Bxe4 27. Qf4 $18) 22. Nf5+ Kg8 23. d6 $40)
20. Bb1 (20. Bd3 gxh6 21. Qd2 Kg7 22. Nh4 Ng8 23. Nf5+ Kh8
24. Re5 $40) 20... gxh6 21. Qd2 Kg7 22. Nh4 Nh7 23. Re7
Qxd5 24. Nf5+ Kh8 25. Be4 $40) 18. Re5 (18. Bd3 Be6
(18... Bb7 19. Bf4 Rbc8 20. Be5 Rfe8 21. Bxf6 gxf6 $13)
19. Bf4 Rbc8 20. Re5 (20. Rc1 c6 (20... Qd7 21. Ne5 Qd5
22. Bxh6 $1 gxh6 23. Qd2 Kg7 24. Re3 Rh8 25. Rce1 $40)
21. Nd6 Rcd8 22. Bg3 Rxd6 23. Re5) 20... Qd8 21. Na7 Bxa7
22. Raxa5 Bb6 23. Bxh6 Bxa5 24. Bxg7 Kxg7 25. Rg5+ Kh8
26. Qd2 Nh7 27. Bxh7 Qf6 28. Bf5 $1 Rg8 29. Rh5+ Kg7
30. Bxe6 $16) 18... Qc6 (18... Qd8 19. Rxa5 Bxa5
20. Na7 $16) 19. Na7 $2 (19. Bxh6 $3 $146 gxh6 (19... Nc4
20. Qc1 $1 Nxe5 21. Nxe5 Qxb5 22. Bxg7 $18) (19... b3
20. Bd3 gxh6 21. Rc1 Qd7 22. Qd2 $18) 20. Qc1 $1 (20. Qd2
Nc4 21. Qxh6 Nxe5 22. Nxe5 Qxc2 23. Qg5+ Kh7 24. Qh4+
Kg7 $11) 20... Kg7 (20... Nc4 21. Rg5+ Kh8 22. Rc5 Bxc5
23. Qxh6+ Kg8 24. Ng5 $18) (20... Nh7 21. Rxa5 $18 Bxa5
22. Bxh7+ $1) (20... b3 21. Qxh6 Ne4 22. Rg5+ Nxg5
23. Qxg5+ Kh8 24. Qh4+ Kg7 25. Qh7+ Kf6 26. Bd3 Ke7
(26... Re8 27. Nc3 $18) 27. Re1+ Kd8 (27... Be6
28. Ne5 $18) 28. Qg7 Re8 29. Ne5 $18) 21. Na7 (21. Rg5+
hxg5 22. Qxg5+ Kh8 23. Qh6+ Kg8 $11) 21... Bxa7 (21... Qd6
22. Nxc8 Rfxc8 23. Nh4 Qf8 24. Nf5+ Kh8 25. Nxh6 $18)
22. Raxa5 Ne4 $8 (22... b3 23. Rg5+ $18) (22... Re8
23. Rxa7 b3 24. Rc5 Qb6 25. Rcxc7 Bb7 26. Bxb3 Qxb3 27. Ne5
Rbc8 28. Qc3 $1 Qxc3 29. Rxf7+ Kg8 30. bxc3 Rxe5 31. dxe5
Kxf7 32. Rxb7+ $18) (22... Ng8 23. Rh5 $1 Bb6
24. Rag5+ $18) 23. Rxa7 (23. Ra1 Bb6 24. Rxe4 b3
25. Bd3 $16) 23... b3 24. Rxe4 bxc2 25. Re7 Rxb2 26. Raxc7
Rb1 27. Rxc6 Rxc1+ 28. Re1 Bb7 29. Rxc1 Bxc6 30. Rxc2 Bxf3
31. gxf3 $16) 19... Bxa7 20. Raxa5 (20. Rexa5 $5 Bb6
21. Ne5 Qd6 22. Nc4 Qxd4 23. Nxb6 Qxd1+ (23... Qxb6 24. Be3
Qe6 25. Bb3 Qe4 26. Qc1 Bb7 (26... Be6 27. f3 Qd3 28. Bc2
Qd7 29. Bxh6 $1 $14) 27. f3 Qc6 28. Qxc6 Bxc6 29. Rc5 Ra8
30. Rxa8 Bxa8 31. Kf2 $14) 24. Bxd1 cxb6 (24... Rxb6
25. Be3 Re6 26. Bf3 $14) 25. Rb5 Bd7 26. Rxb4 Ra8 27. Ra3
(27. Rxa8 Rxa8 28. Bf3 Ra1 29. Rc4 Be6 $11) 27... Rac8
28. Bd2 Bxh3 29. Bf3 Be6 30. Rxb6 Rfd8 31. Ba5 $14)
20... Bb6 21. Rab5 Bb7 $2 (21... Rd8 $1 22. Rxb4 Bb7 $44)
22. Be3 $2 (22. Bxh6 $1 gxh6 23. Qd2 Nh7 24. Rh5 f5
25. Bb3+ Kg7 26. Re5 $40) 22... Rfe8 $11 23. Qd2 Rxe5
24. Rxe5 Ra8 25. Bb3 Qd6 26. Nh4 $2 Nd7 27. Nf5 Qf6
28. Ne7+ Kh8 29. Nd5 Qg6 $2 (29... Qd6 $1 30. Nxb6
cxb6 $17) 30. Nf4 $2 (30. Bc2 Qd6 (30... Qc6 31. Qd3 g6
32. Qe4 $1 $13) 31. Bf4 Bxd5 $8 32. Re8+ Rxe8 33. Bxd6 cxd6
34. Ba4 Re4 (34... Rd8 35. Qxb4 $18) 35. Bxd7 Rxd4 $13)
30... Qb1+ 31. Kh2 Nxe5 $19 32. dxe5 Qf5 33. e6 fxe6
34. Bxb6 cxb6 35. Nxe6 Qe5+ 36. f4 Qe4 37. Nd8 Bd5 $1
38. Bc2 (38. Bxd5 Rxd8 $19) 38... Qxg2+ 39. Qxg2 Bxg2
40. Nf7+ Kg8 41. Bb3 Bf1 42. Nxh6+ Kf8 43. Ng4 b5 44. Ne5
Bc4 45. Nxc4 bxc4 46. Bxc4 Rc8 47. Bb3 Rd8 48. Be6 Rd2+
49. Kg3 Rxb2 50. Kf3 Ke7 0-1

[jdart]

That's a good one, too. About 2 1/2 minutes for Houdini to solve, on an older Intel quad (Q6700).

--Jon

[Jouni]

Second position with Critter in slow dual:

Analysis by Critter 1.2 64-bit:

1.Bxh6 gxh6 2.Qc1 Kg7 3.Na7 Bxa7 4.Raxa5 Ng8 5.Rxa7 b3 6.Rc5 Qb6 7.Raxc7 bxc2 8.Qxc2 Qg6 9.Qc3 Bb7 10.Nh4 Qb1+ 11.Kh2 Nf6 12.Nf5+ Kh8 13.Qe3 Rg8 14.Qxh6+ Nh7 15.Ne3 Be4 16.Qh5 Bg6 17.Qe5+ f6 18.Qe7 Qxb2 19.Nf5 Qxf2
+/= (0.36 ++) Depth: 18/52 00:01:19 186mN
1.Bxh6 gxh6 2.Qc1 Kg7 3.Na7 Bxa7 4.Raxa5 Ng8 5.Rxa7 b3 6.Rc5 Qb6 7.Raxc7 bxc2 8.Qxc2 Qg6 9.Qc3 Bb7 10.Nh4 Qf6 11.Qg3+ Kh8 12.Nf5 Rfe8 13.Re5 Be4 14.Rxe8 Rxe8 15.Nd6
+/= (0.45 ++) Depth: 18/61 00:01:36 223mN
1.Bxh6 gxh6 2.Qc1 Kg7 3.Na7 Bxa7 4.Raxa5 Ng8 5.Rxa7 b3 6.Rc5 Qb6 7.Raxc7 bxc2 8.Qxc2 Qg6 9.Qc3 Bxh3 10.Nh4 Qb1+ 11.Kh2 Bg4 12.f3 Nf6 13.d5 Qxb2 14.Qxb2 Rxb2 15.fxg4 Nxg4+ 16.Kg3 Ne3 17.d6 Rd8 18.d7 Rd2 19.Re5 Nxg2 20.Nxg2 R8xd7 21.Rxd7 Rxd7 22.Nf4 Kf6
+/= (0.58 ++) Depth: 18/61 00:01:53 261mN

Jouni