Author: John Merlino
Date: 18:18:43 11/16/02
Go up one level in this thread
On November 16, 2002 at 17:08:24, andrew tanner wrote:
> Best move: Rxe7! and a mate in x follows.
>Taken from one of Capablanca's instructional games.
Chessmaster 9000 on a P3-733 chooses 1.Rxe7 in four seconds, but does not see a
mate, even after several minutes.
Yes, if 1...Rxe7, it's Mate in 6. And, if 1...Nxe7, things get bad pretty
quickly after another sacrifice, 2.Bxh7+, followed by 2...Kh8 3.Qh5. But, even
with this line, I don't think you can force mate with White in less than 15
moves.
But Black does not have to take back, after all, and can choose to remain down a
piece to two pawns (although eventually it will probably be only one pawn), with
1...g6.
Time Depth Score Positions Moves
0:00 1/4 -1.19 7278 1.Rde1 g6 2.Nd2 Re8 3.f4
0:00 1/4 -0.77 15977 1.Bf5 Rdd8 2.Qe4 Rfe8 3.Bxh7+ Kf8
0:00 1/5 -0.74 19301 1.Bf5 Rdd8 2.Qe4 d5 3.Rxd5
0:01 1/6 -0.81 78106 1.Bf5 Rdd8 2.Qe4 d5 3.Rxd5 Rxd5
4.Qxd5 Rd8
0:02 1/6 -0.65 88708 1.Bxh7+ Kxh7 2.Qh5+ Kg8 3.Rxe7
g6 4.Rxd7 Qxd7 5.Qh6 Re8
0:02 1/7 -0.40 138747 1.Bxh7+ Kxh7 2.Qh5+ Kg8 3.Rxe7
g6 4.Rxd7 Qxd7 5.Qxc5 Qxg4+ 6.hxg4
dxc5 7.Rd7
0:03 1/7 -0.27 197349 1.Rxe7 Nxe7 2.Bxh7+ Kh8 3.Qh5 Ng8
4.Bf5+ Nh6 5.g5 Re7 6.gxh6
0:04 1/8 2.09 346064 1.Rxe7 g6 2.Rxd7 Qxd7 3.Be4 b6
4.Qb7 Qe6 5.Re1
0:06 1/9 2.29 541713 1.Rxe7 g6 2.Rxd7 Qxd7 3.Be4 b6
4.Qb7 Qe6 5.Re1 a5 6.Bc6
0:11 1/10 2.29 1006747 1.Rxe7 g6 2.Rxd7 Qxd7 3.Be4 b6
4.Qb7 Qe6 5.Re1 a5 6.Bc6
0:21 2/11 2.71 2156478 1.Rxe7 g6 2.Rxd7 Qxd7 3.Be4 b5
4.Qb7 Rd8 5.Qxa6 Ne7 6.Qb7 Qe6
7.Re1
1:27 3/12 2.80 10216897 1.Rxe7 g6 2.Rxd7 Qxd7 3.Be4 b5
4.Qxc5 Qxg4+ 5.hxg4 dxc5 6.Bb7
a5 7.Rd5 f5 8.gxf5
4:50 4/13 2.75 34153483 1.Rxe7 g6 2.Rxd7 Qxd7 3.Be4 b6
4.Qb7 Qb5 5.Bc6 Qa5 6.Bd7 Ne7 7.Rxd6
Qxa2 8.Rxb6
I played the game out from the initial position with CM in a G/60 time control,
with ponder off on both sides, and it took 58 moves to mate:
[Event ""]
[Site ""]
[Date "2002.11.16"]
[Round ""]
[White "CM No Ponder"]
[Black "CM No Ponder"]
[TimeControl "3600"]
[Result "1-0"]
[Setup "1"]
[FEN "2n2rk1/1pqrbppp/p2p4/2pQ4/6P1/1P1B1N1P/P3RP2/3R2K1 w - - 0 1"]
1.Rxe7 {00:00} 1...g6 {00:54 {Score: 2.75, Depth: 3/12}} 2.Rxd7 {01:24
{Score: 2.82, Depth: 3/12}} 2...Qxd7 {01:16 {Score: 2.75, Depth: 2/11}}
3.Be4 {02:24 {Score: 2.81, Depth: 3/11}} 3...b6 {02:11 {Score: 2.61,
Depth: 3/11}} 4.Qb7 {03:40 {Score: 2.89, Depth: 3/11}} 4...Rd8 {03:34
{Score: 2.74, Depth: 4/12}} 5.Qxa6 {04:34 {Score: 3.03, Depth: 2/10}}
5...Qc7 {04:53 {Score: 2.76, Depth: 3/11}} 6.Qb7 {05:20 {Score: 3.04,
Depth: 2/10}} 6...Qxb7 {05:38 {Score: 2.57, Depth: 4/12}} 7.Bxb7 {05:48
{Score: 2.38, Depth: 4/12}} 7...Ne7 {06:50 {Score: 2.38, Depth: 5/12}}
8.Bd5 {06:40 {Score: 2.38, Depth: 4/11}} 8...Kf8 {08:04 {Score: 2.43,
Depth: 5/12}} 9.Nh4 {07:50 {Score: 2.42, Depth: 5/12}} 9...b5 {10:51
{Score: 2.26, Depth: 5/12}} 10.Nf3 {08:59 {Score: 2.26, Depth: 4/11}}
10...h6 {11:48 {Score: 2.24, Depth: 4/11}} 11.Ne1 {10:07 {Score: 2.24,
Depth: 4/11}} 11...Nxd5 {13:02 {Score: 2.33, Depth: 5/12}} 12.Rxd5 {
10:52 {Score: 2.36, Depth: 6/12}} 12...Ra8 {14:04 {Score: 2.31, Depth:
6/12}} 13.Rxd6 {11:57 {Score: 2.29, Depth: 6/12}} 13...Rxa2 {14:53
{Score: 2.24, Depth: 6/12}} 14.Rb6 {12:51 {Score: 2.23, Depth: 5/11}}
14...Ra1 {15:52 {Score: 2.09, Depth: 7/13}} 15.Kf1 {13:55 {Score: 2.00,
Depth: 7/13}} 15...b4 {17:10 {Score: 2.03, Depth: 7/13}} 16.Rb8+ {14:48
{Score: 2.00, Depth: 6/12}} 16...Ke7 {17:44 {Score: 2.00, Depth: 6/12}}
17.Ke2 {15:51 {Score: 1.81, Depth: 6/12}} 17...Ra2+ {18:25 {Score: 1.81,
Depth: 5/11}} 18.Kd3 {16:19 {Score: 1.93, Depth: 5/11}} 18...Rxf2 {19:02
{Score: 1.75, Depth: 5/11}} 19.Rh8 {17:28 {Score: 1.25, Depth: 6/11}}
19...Kd6 {19:40 {Score: 1.25, Depth: 6/11}} 20.Kc4 {18:36 {Score: 1.26,
Depth: 7/12}} 20...Re2 {20:37 {Score: 1.21, Depth: 7/12}} 21.Nd3 {19:28
{Score: 1.21, Depth: 7/12}} 21...Rc2+ {21:44 {Score: 1.27, Depth: 7/12}}
22.Kb5 {19:28 {Score: 1.51, Depth: 1/2}} 22...Rc3 {22:27 {Score: 1.27,
Depth: 7/12}} 23.Rd8+ {20:06 {Score: 1.27, Depth: 6/11}} 23...Ke7 {23:03
{Score: 1.30, Depth: 8/13}} 24.Rd5 {20:34 {Score: 1.30, Depth: 7/12}}
24...Ke6 {24:00 {Score: 1.37, Depth: 7/12}} 25.Kc6 {21:26 {Score: 1.37,
Depth: 6/11}} 25...Kf6 {25:31 {Score: 1.68, Depth: 6/11}} 26.Nxc5 {22:19
{Score: 1.68, Depth: 6/11}} 26...Rxh3 {26:09 {Score: 1.67, Depth: 6/11}}
27.Rd4 {23:04 {Score: 1.67, Depth: 5/10}} 27...Rf3 {27:20 {Score: 1.38,
Depth: 6/11}} 28.Rxb4 {23:53 {Score: 1.38, Depth: 5/10}} 28...Kg5 {28:09
{Score: 1.60, Depth: 7/11}} 29.Rc4 {25:32 {Score: 1.63, Depth: 7/11}}
29...Rf6+ {28:51 {Score: 1.64, Depth: 7/11}} 30.Kd7 {26:00 {Score: 1.64,
Depth: 7/11}} 30...Rf1 {29:59 {Score: 1.64, Depth: 7/11}} 31.Ke7 {26:41
{Score: 1.64, Depth: 6/10}} 31...h5 {30:35 {Score: 1.70, Depth: 7/11}}
32.gxh5 {27:12 {Score: 1.70, Depth: 6/10}} 32...Kxh5 {31:21 {Score:
1.54, Depth: 7/11}} 33.b4 {27:42 {Score: 1.56, Depth: 6/10}} 33...g5 {
31:46 {Score: 1.36, Depth: 6/10}} 34.Ne4 {28:27 {Score: 1.80, Depth:
7/11}} 34...Kg6 {32:49 {Score: 1.95, Depth: 7/11}} 35.b5 {29:22 {Score:
2.11, Depth: 6/10}} 35...Rb1 {33:14 {Score: 2.08, Depth: 6/10}} 36.Rc6+
{30:01 {Score: 2.47, Depth: 6/10}} 36...Kf5 {33:33 {Score: 2.47, Depth:
6/10}} 37.Nd6+ {30:47 {Score: 3.21, Depth: 6/10}} 37...Kg4 {34:06
{Score: 3.21, Depth: 6/10}} 38.b6 {31:26 {Score: 3.41, Depth: 6/10}}
38...f5 {34:20 {Score: 3.41, Depth: 5/9}} 39.b7 {32:05 {Score: 3.44,
Depth: 6/10}} 39...f4 {34:52 {Score: 3.43, Depth: 6/10}} 40.Rc8 {32:33
{Score: 3.48, Depth: 5/9}} 40...Kh3 {35:29 {Score: 3.61, Depth: 6/10}}
41.Rh8+ {32:57 {Score: 3.58, Depth: 5/9}} 41...Kg3 {35:49 {Score: 4.57,
Depth: 6/10}} 42.Ne4+ {33:33 {Score: 5.68, Depth: 6/10}} 42...Kg2 {36:04
{Score: 5.76, Depth: 7/11}} 43.b8=Q {34:09 {Score: 5.92, Depth: 7/11}}
43...Rxb8 {36:13 {Score: 6.25, Depth: 5/11}} 44.Rxb8 {34:20 {Score:
6.24, Depth: 7/11}} 44...g4 {36:40 {Score: 6.07, Depth: 7/11}} 45.Ke6 {
34:46 {Score: 6.07, Depth: 6/10}} 45...g3 {37:19 {Score: 8.23, Depth:
7/11}} 46.Kf5 {35:19 {Score: 8.23, Depth: 6/10}} 46...f3 {37:45 {Score:
8.40, Depth: 7/11}} 47.Rg8 {35:41 {Score: 8.40, Depth: 6/10}} 47...Kf1 {
38:43 {Score: 8.46, Depth: 7/11}} 48.Rxg3 {36:14 {Score: 8.46, Depth:
6/10}} 48...Ke2 {39:12 {Score: 8.56, Depth: 7/11}} 49.Ke5 {36:48 {Score:
8.56, Depth: 7/11}} 49...f2 {39:40 {Score: 8.56, Depth: 8/12}} 50.Rg2 {
37:17 {Score: 8.57, Depth: 7/11}} 50...Kd3 {40:05 {Score: 8.53, Depth:
7/11}} 51.Rxf2 {37:49 {Score: 8.55, Depth: 7/11}} 51...Kc4 {40:05
{Score: Mate07, EGDB}} 52.Rf3 {37:49 {Score: Mate07, EGDB}} 52...Kb5 {
40:05 {Score: Mate06, EGDB}} 53.Kd5 {37:49 {Score: Mate06, EGDB}}
53...Kb6 {40:05 {Score: Mate05, EGDB}} 54.Rb3+ {37:49 {Score: Mate05,
EGDB}} 54...Kc7 {40:05 {Score: Mate04, EGDB}} 55.Nf6 {37:49 {Score:
Mate04, EGDB}} 55...Kd8 {40:05 {Score: Mate03, EGDB}} 56.Kd6 {37:49
{Score: Mate03, EGDB}} 56...Kc8 {40:05 {Score: Mate02, EGDB}} 57.Rb4 {
37:49 {Score: Mate02, EGDB}} 57...Kd8 {40:05 {Score: Mate01, EGDB}}
58.Rb8# {37:50 {Score: Mate01, EGDB}} 1-0
jm
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