Author: John Merlino
Date: 19:45:52 07/09/05
Go up one level in this thread
On July 09, 2005 at 22:04:19, Will Singleton wrote:
>Bxf7+?
>
>[d]r1b1kb1r/pp1n1ppp/2p2n2/q7/P1BpP3/2N2N2/1P1B1PPP/R2QK2R w KQkq -
>
>Looks like a really good move to play against a human, who misplayed and ended
>up mated in a few moves. Interestingly, black was 2 pieces up, but was
>completely busted due to its exposed king.
>
>Note also that some programs prefer to give up the queen as black, with a
>positive eval for black (eg crafty), as in 10. Bxf7+ Kxf7 11. Ng5+ Qxg5!? This
>in fact may be black's best defense, can't tell.
>
>[Event "ICC 30 0"]
>[Site "Internet Chess Club"]
>[Date "2005.07.09"]
>[Round "-"]
>[White "Amateur"]
>[Black "xcrack"]
>[Result "1-0"]
>[ICCResult "Black resigns"]
>[WhiteElo "2543"]
>[BlackElo "2431"]
>[Opening "QGD Slav: Soultanbéieff variation"]
>[ECO "D16"]
>[NIC "SL.03"]
>[Time "21:12:46"]
>[TimeControl "1800+0"]
>
>1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 dxc4 5. a4 e6 6. Bg5 Nbd7 7. e4 Qa5 8.
>Bd2 e5 9. Bxc4 exd4 10. Bxf7+ Kxf7 11. Ng5+ Kg6 12. Nd5 Qc5 13. Nf4+ Kxg5
>14. h4+ Kh6 15. g4 g5 16. hxg5+ Kxg5 17. Qf3 Qe5 18. O-O-O Bb4 19. Rh5+ Nxh5
>20. Ne6+ Kg6 21. gxh5+ Qxh5 22. Rg1+ {Black resigns} 1-0
Here's what CM9_R1 on a P4-2.4 says:
Time Depth Score Positions Moves
0:00 1/3 0.00 4163 1.Ne2 Qb6 2.Qc2 Bb4 3.Nexd4 Bxd2+
4.Kxd2
0:00 1/3 0.07 4904 1.Nb5 Qb6 2.a5
0:00 1/4 0.25 8252 1.Nb5 Bb4 2.Nd6+ Ke7 3.Nxf7 Rf8
0:00 1/5 0.31 20105 1.Nb5 Bb4 2.Nd6+ Ke7 3.Nxf7 Bxd2+
4.Qxd2 Qxd2+ 5.Nxd2
0:00 1/5 0.36 40779 1.Nd5 Qd8 2.Nxf6+ Qxf6 3.O-O Bd6
4.b4
0:00 1/6 -0.11 67277 1.Nd5 Qc5 2.Nxf6+ Nxf6 3.Qb3 Qe7
4.Ng5
0:00 1/6 0.36 93655 1.Ne2 Bb4 2.O-O Bxd2 3.Nxd2 c5
4.Ng3
0:01 1/7 -0.04 208555 1.Ne2 Bb4 2.Bxf7+ Kf8 3.Be6 Nc5
4.Bxc8 Bxd2+ 5.Qxd2 Qxd2+ 6.Nxd2
Rxc8 7.Nxd4 Nfxe4 8.Nxe4 Nxe4
0:01 1/7 0.12 256727 1.Nd5 Qc5 2.Nxf6+ Nxf6 3.Qb3 Qe7
4.Ng5 Nxe4 5.Bxf7+ Kd8
0:02 1/8 0.14 502877 1.Nd5 Qc5 2.Nxf6+ Nxf6 3.Qb3 Qe7
4.Ng5 Nxe4 5.Bxf7+ Kd8 6.Ne6+ Bxe6
7.Bxe6 Nxd2 8.Kxd2
0:07 1/9 0.35 1382531 1.Nd5 Qc5 2.Nxf6+ Nxf6 3.Rc1 Qe7
4.O-O Nxe4 5.Re1 Bg4 6.Bf4
0:15 1/10 0.27 3220253 1.Nd5 Qc5 2.Nxf6+ Nxf6 3.Rc1 Qe7
4.e5 Bg4 5.O-O Bxf3 6.Qxf3 Qxe5
0:42 1/11 0.46 8917853 1.Nd5 Qc5 2.Nxf6+ Nxf6 3.Rc1 Qe7
4.e5 Bg4 5.O-O Nd5 6.Bxd5 cxd5
7.Bf4
1:53 1/12 0.17 23909567 1.Nd5 Qc5 2.Nxf6+ Nxf6 3.Rc1 Qh5
4.O-O Bg4 5.Qb3 b5 6.Be2 Nxe4 7.Bf4
It thinks about Bxf7+ for several seconds at depth 12, but not at all before
that. It appears that Black is totally fine after 10.Bxf7+ Kxf7 11.Ng5+ Ke8
12.Nd5 Qd8 13.Ne6 cxd5 14.Nxd8 Kxd8 15.exd5, resulting in this position:
[D]r1bk1b1r/pp1n2pp/5n2/3P4/P2p4/8/1P1B1PPP/R2QK2R b KQ - 0 15
The King evaluates this position as follows:
Time Depth Score Positions Moves
0:00 1/3 -0.18 1516 6...Bd6 7.O-O Re8 8.Qf3
0:00 1/4 -0.30 5472 6...Bd6 7.O-O Re8 8.Qf3 Nb6
0:00 1/5 -0.18 12733 6...Bd6 7.O-O Re8 8.Bg5 Re5
0:00 1/6 -0.29 40336 6...Bd6 7.O-O Re8 8.Re1 Re5 9.Rxe5
Nxe5
0:00 1/7 -0.17 90925 6...Bd6 7.O-O Re8 8.Re1 Rxe1+ 9.Bxe1
Nb6 10.Ba5
0:01 1/8 -0.21 198548 6...Bd6 7.O-O Re8 8.Re1 Re5 9.Rxe5
Nxe5 10.Bg5
0:03 1/9 -0.12 665015 6...Bd6 7.O-O Re8 8.Qc2 Nb6 9.Bg5
Nxd5 10.Rad1 Nb4 11.Bxf6+ gxf6
12.Qxh7
0:12 1/10 -0.08 2194604 6...Bd6 7.O-O Re8 8.Rc1 d3 9.Bg5
Ne5 10.Re1 Bd7 11.Bxf6+ gxf6 12.Re4
0:32 1/11 0.01 5565706 6...Bd6 7.O-O Re8 8.Rc1 d3 9.Qb3
Re5 10.Qxd3 Rxd5 11.Qc3 Ne4
1:32 1/12 0.14 16018806 6...Bd6 7.O-O Re8 8.Rc1 h6 9.Qc2
Nb6 10.Qg6 Nbxd5 11.Rfe1 Bd7 12.Rxe8+
Nxe8 13.Qe4
jm
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