Author: Omid David Tabibi
Date: 09:37:45 11/03/03
Go up one level in this thread
On November 03, 2003 at 12:22:20, Tord Romstad wrote:
>[D]2r2bk1/4qp2/3n2p1/2R1p1Np/2p1N3/r6P/1Q3PP1/3R2K1 w - - bm Rxc8; id "ECM.973";
>
>My engine wants to play Rxd6 rather than Rxc8 here, even after several
>minutes of thinking (analysis below). Only at ply 13 does the best move
>change to Rxc8, but even then the score does not rise much. As far as I can
>see, Rxd6 should win easily. Am I (and my engine) missing something, or is
>Rxd6 a second solution?
Falcon 0.043 running on GenuineIntel 733MHz 256MB:
depth time nodes nps score variation
3/ 8 0.00 0k 0k 1.23 1.d1d6 c8c5 2.b2a3
4/14 0.02 3k 189k 1.35 1.d1d6 a3a2 2.e4f6 g8h8 3.b2a2 c8c5
5/14 0.06 8k 141k 1.30 1.d1d6 c8c5 2.e4f6 g8h8 3.b2a3 e7c7
5/14 0.10 11k 118k 1.65 1.e4d6
5/14 0.13 17k 135k 2.04 1.e4d6 a3b3 2.b2e5 e7e5 3.c5e5 f7f6
6/16 0.27 34k 129k 1.73 1.e4d6
6/16 0.31 39k 128k 0.84 1.e4d6 c8c5 2.b2a3 c5c6 3.g5e4 c4c3
7/17 0.53 72k 137k 1.09 1.e4d6 c8c5 2.b2a3 c5c6 3.g5e4 c4c3
4.a3b3
7/18 0.63 86k 137k 1.14 1.d1d6
7/22 0.78 110k 141k 1.51 1.d1d6 c8c5 2.b2a3 c5b5 3.a3c1 f8h6
4.e4f6 g8h8
8/24 1.48 218k 147k 1.50 1.d1d6 a3b3 2.b2b3 c4b3 3.c5c8 b3b2
4.c8b8 e7a7 5.e4f6 g8g7
8/26 2.00 305k 152k 1.76 1.c5c8 a3b3 2.b2c2 d6c8 3.d1d7 e7b4
9/26 2.88 449k 155k 2.06 1.c5c8
9/30 4.76 762k 160k 2.61 1.c5c8 a3b3 2.b2c1 d6c8 3.d1d7 e7b4
4.e4f6 g8h8 5.g5f7 h8g7 6.f6h5 g7g8
7.h5f6 g8g7
10/28 6.92 1128k 163k 2.73 1.c5c8 a3b3 2.b2c2 d6c8 3.d1d7 c8b6
11/33 12.78 2106k 164k 2.74 1.c5c8 a3b3 2.b2c2 d6c8 3.d1d7 c8b6
4.d7e7 f8e7 5.h3h4 e7g5 6.h4g5 g8h8
12/34 23.24 3722k 160k 2.78 1.c5c8 a3b3 2.b2a1 d6c8 3.d1d7 b3a3
4.a1c1 c8b6 5.d7e7 f8e7 6.c1b2 b6d7
>
> 1 1.25 0.00 214 Rxd6 Rxc5 Qxa3
> 2 0.84 0.01 1256 Rxd6 Qxd6 Nxd6 Rxc5
> 3 0.84 0.02 2220 Rxd6 Qxd6 Nxd6 Rxc5
> 4 1.09 0.06 6946 Rxd6 Qxd6 Nxd6 Rxc5 Qxa3 Bxd6
> 5 0.84 0.26 33210 Rxd6 Rxc5 Nf6+ Kg7 Qxa3 Qxd6 Ne8+ Kg8
> 6 >= 0.84 0.43 51999 Qxa3 Nxe4 Nxe4 Rxc5 Rd7
> 6 >= 0.86 0.44 52606 Qxa3 Nxe4 Nxe4 Rxc5 Rd7
> 6 >= 0.94 0.44 53431 Qxa3 Nxe4 Nxe4 Rxc5 Rd7
> 6 >= 1.08 0.44 54490 Qxa3 Nxe4 Nxe4 Rxc5 Rd7
> 6 <= 1.31 0.59 77704 Qxa3 Nxe4 Nxe4 Rxc5 Rd7 Qxd7 Nf6+
> 6 <= 1.30 0.59 79014 Qxa3 Nxe4 Nxe4 Rxc5 Rd7 Qxd7 Nf6+
> 6 <= 1.27 0.59 80763 Qxa3 Nxe4 Nxe4 Rxc5 Rd7 Qxd7 Nf6+
> 6 <= 1.19 0.61 83540 Qxa3 Nxe4 Nxe4 Rxc5 Rd7 Qxd7 Nf6+
> 6 >= 1.09 0.61 83738 Qxa3 Nxe4 Nxe4 Rxc5 Rd7 Qxd7 Nf6+
> 6 >= 1.11 0.61 83948 Qxa3 Nxe4 Nxe4 Rxc5 Rd7 Qxd7 Nf6+
> 6 <= 1.16 0.61 85437 Qxa3 Nxe4 Nxe4 Rxc5 Rd7 Qxd7 Nf6+
> 6 <= 1.14 0.61 86237 Qxa3 Nxe4 Nxe4 Rxc5 Rd7 Qxd7 Nf6+
> 6 <= 1.11 0.62 87236 Qxa3 Nxe4 Nxe4 Rxc5 Rd7 Qxd7 Nf6+
> 6 1.11 0.62 87236 Qxa3 Nxe4 Nxe4 Rxc5 Rd7 Qxd7 Nf6+
> 7 >= 1.11 0.71 100871 Qxa3 Nxe4 Nxe4 Rxc5 Rd7 Qxd7 Nf6+
> 7 <= 1.11 1.09 168762 Qxa3 Nxe4 Nxe4 Rxc5 Rd7 Qxd7 Nf6+ Kg7
> Nxd7
> 7 1.11 1.09 168762 Qxa3 Nxe4 Nxe4 Rxc5 Rd7 Qxd7 Nf6+ Kg7
> Nxd7
> 8 >= 1.11 1.83 310438 Rxd6 Rxc5 Qxa3 Rd5 Qf3 Rxd6 Nxd6
> 8 >= 1.12 1.86 316218 Rxd6 Rxc5 Qxa3 Rd5 Qf3 Rxd6 Nxd6
> 8 >= 1.19 1.90 328091 Rxd6 Rxc5 Qxa3 Rd5 Qf3 Rxd6 Nxd6
> 8 >= 1.33 1.97 344962 Rxd6 Rxc5 Qxa3 Rd5 Qf3 Rxd6 Nxd6
> 8 >= 1.58 2.10 375800 Rxd6 Rxc5 Qxa3 Rd5 Qf3 Rxd6 Nxd6
> 8 <= 1.95 2.45 449820 Rxd6 Rxc5 Qxa3 Rd5 Qf3 Rxd6 Nxd6 c3 Ngxf7
> 8 <= 1.94 2.45 453058 Rxd6 Rxc5 Qxa3 Rd5 Qf3 Rxd6 Nxd6 c3 Ngxf7
> 8 <= 1.91 2.47 457497 Rxd6 Rxc5 Qxa3 Rd5 Qf3 Rxd6 Nxd6 c3 Ngxf7
> 8 <= 1.83 2.49 466440 Rxd6 Rxc5 Qxa3 Rd5 Qf3 Rxd6 Nxd6 c3 Ngxf7
> 8 <= 1.67 2.52 477561 Rxd6 Rxc5 Qxa3 Rd5 Qf3 Rxd6 Nxd6 c3 Ngxf7
> 8 >= 1.59 2.53 479714 Rxd6 Rxc5 Qxa3 Rd5 Qf3 Rxd6 Nxd6 c3 Ngxf7
> 8 >= 1.61 2.54 482506 Rxd6 Rxc5 Qxa3 Rd5 Qf3 Rxd6 Nxd6 c3 Ngxf7
> 8 <= 1.66 2.55 486303 Rxd6 Rxc5 Qxa3 Rd5 Qf3 Ra5 Nf6+ Kh8 Qc3
> 8 <= 1.64 2.56 489962 Rxd6 Rxc5 Qxa3 Rd5 Qf3 Ra5 Nf6+ Kh8 Qc3
> 8 <= 1.61 2.57 494272 Rxd6 Rxc5 Qxa3 Rd5 Qf3 Ra5 Nf6+ Kh8 Qc3
> 8 1.61 2.57 494272 Rxd6 Rxc5 Qxa3 Rd5 Qf3 Ra5 Nf6+ Kh8 Qc3
> 9 <= 1.59 3.88 796377 Rxd6 Rxc5 Qxa3 Rc7 Qa6 c3
> 9 <= 1.58 3.93 814308 Rxd6 Rxc5 Qxa3 Rc7 Qa6 c3
> 9 >= 1.56 4.31 907464 Rxd6 Rxc5 Qxa3 Rc7 Qa6 c3
> 9 >= 1.58 4.33 913105 Rxd6 Rxc5 Qxa3 Rc7 Qa6 c3
> 9 1.58 4.33 913105 Rxd6 Rxc5 Qxa3 Rc7 Qa6 c3
>10 <= 1.56 7.71 1743388 Rxd6 Rxc5 Qxa3 Rd5 Qf3 Rxd6 Nxd6 c3 Ndxf7
> c2
>10 <= 1.55 7.95 1841969 Rxd6 Rxc5 Qxa3 Rd5 Qf3 Rxd6 Nxd6 c3 Ndxf7
> c2
>10 <= 1.52 8.21 1950516 Rxd6 Rxc5 Qxa3 Rd5 Qf3 Rxd6 Nxd6 c3 Ndxf7
> c2
>10 <= 1.44 9.23 2260120 Rxd6 Rxc5 Qxa3 Rd5 Qf3 Rxd6 Nxd6 c3 Ndxf7
> c2
>10 >= 1.30 10.97 2673547 Rxd6 Rxc5 Qxa3 Rd5 Qf3 Rxd6 Nxd6 c3 Ndxf7
> c2 Qc6
>10 >= 1.31 11.06 2702280 Rxd6 Rxc5 Qxa3 Rd5 Qf3 Rxd6 Nxd6 c3 Ndxf7
> c2 Qc6
>10 >= 1.38 11.17 2741543 Rxd6 Rxc5 Qxa3 Rd5 Qf3 Rxd6 Nxd6 c3 Ndxf7
> c2 Qc6
>10 <= 1.42 11.65 2890794 Rxd6 Rxc5 Qxa3 Rd5 Qf3 Rxd6 Nxd6 c3 Ndxf7
> c2 Qc6
>10 <= 1.41 11.88 2979645 Rxd6 Rxc5 Qxa3 Rd5 Qf3 Rxd6 Nxd6 c3 Ndxf7
> c2 Qc6
>10 >= 1.39 11.93 2999799 Rxd6 Rxc5 Qxa3 Rd5 Qf3 Rxd6 Nxd6 c3 Ndxf7
> c2 Qc6
>10 >= 1.41 11.98 3022637 Rxd6 Rxc5 Qxa3 Rd5 Qf3 Rxd6 Nxd6 c3 Ndxf7
> c2 Qc6
>10 1.41 11.98 3022637 Rxd6 Rxc5 Qxa3 Rd5 Qf3 Rxd6 Nxd6 c3 Ndxf7
> c2 Qc6
>11 >= 1.41 15.39 3859655 Rxd6 Rxc5 Qxa3 Rd5 Qf3 Rxd6 Nxd6 c3 Ndxf7
> c2 Qc6
>11 >= 1.42 16.11 4042385 Rxd6 Rxc5 Qxa3 Rd5 Qf3 Rxd6 Nxd6 c3 Ndxf7
> c2 Qc6
>11 >= 1.48 19.26 4798747 Rxd6 Rxc5 Qxa3 Rd5 Qf3 Rxd6 Nxd6 c3 Ndxf7
> c2 Qc6
>11 <= 1.61 27.46 6817340 Rxd6 Rxc5 Qxa3 Rc7 Qa2 Qxd6 Nxd6 Bxd6 Qa8+
> Kg7 Qd5
>11 <= 1.59 28.05 7010339 Rxd6 Rxc5 Qxa3 Rc7 Qa2 Qxd6 Nxd6 Bxd6 Qa8+
> Kg7 Qd5
>11 <= 1.56 28.71 7240119 Rxd6 Rxc5 Qxa3 Rc7 Qa2 Qxd6 Nxd6 Bxd6 Qa8+
> Kg7 Qd5
>11 >= 1.50 28.89 7297967 Rxd6 Rxc5 Qxa3 Rc7 Qa2 Qxd6 Nxd6 Bxd6 Qa8+
> Kg7 Qd5
>11 >= 1.52 29.18 7378652 Rxd6 Rxc5 Qxa3 Rc7 Qa2 Qxd6 Nxd6 Bxd6 Qa8+
> Kg7 Qd5
>11 <= 1.55 30.11 7661216 Rxd6 Rxc5 Qxa3 Rc7 Qa2 Kg7 Ra6 Kh8 Rf6
> Qe8 Qa5
>11 <= 1.53 30.61 7841242 Rxd6 Rxc5 Qxa3 Rc7 Qa2 Kg7 Ra6 Kh8 Rf6
> Qe8 Qa5
>11 >= 1.53 30.90 7921430 Rxd6 Rxc5 Qxa3 Rc7 Qa2 Kg7 Ra6 Kh8 Rf6
> Qe8 Qa5
>11 1.53 30.90 7921430 Rxd6 Rxc5 Qxa3 Rc7 Qa2 Kg7 Ra6 Kh8 Rf6
> Qe8 Qa5
>12 <= 1.52 1:03 16249108 Rxd6 Rxc5 Qxa3 Rc7 Qa2 Kg7 Ra6 Kh8 Rf6
> Qe8 Qa5
>12 <= 1.50 1:06 17143797 Rxd6 Rxc5 Qxa3 Rd5 Qf3 Rxd6 Nxd6 e4 Qf4
> c3
>12 >= 1.48 1:14 19086524 Rxd6 Rxc5 Qxa3 Rd5 Qf3 Rxd6 Nxd6 e4 Qf4
> c3 Ndxe4 f5
>12 <= 1.48 1:15 19621653 Rxd6 Rxc5 Qxa3 Rd5 Qf3 Rxd6 Nxd6 e4 Qf4
> c3 Ndxe4 f5
>12 1.48 1:15 19621653 Rxd6 Rxc5 Qxa3 Rd5 Qf3 Rxd6 Nxd6 e4 Qf4
> c3 Ndxe4 f5
>13 <= 1.47 3:02 46606404 Rxd6 Rxc5 Qxa3 Rd5 Qf3 Rxd6 Nxd6 e4 Qf4
> c3 Ndxe4 f5
>13 >= 1.47 3:38 55969782 Rxc8 Nxc8 Rd7 Rb3 Qc2 Nb6 Rxe7 Bxe7 Nf3
> Rb5 Nc3
>13 1.47 3:38 55969782 Rxc8 Nxc8 Rd7 Rb3 Qc2 Nb6 Rxe7 Bxe7 Nf3
> Rb5 Nc3
>14 >= 1.47 4:13 64929235 Rxc8 Nxc8 Rd7 Rb3 Rxe7 Rxb2 Nf6+ Kh8 Rxf7
> Bg7 Ne8 Nd6 Nxd6
>14 >= 1.48 4:31 69704473 Rxc8 Nxc8 Rd7 Rb3 Rxe7 Rxb2 Nf6+ Kh8 Rxf7
> Bg7 Ne8 Nd6 Nxd6
>14 >= 1.55 4:43 73298282 Rxc8 Nxc8 Rd7 Rb3 Rxe7 Rxb2 Nf6+ Kh8 Rxf7
> Bg7 Ne8 Nd6 Nxd6
>14 >= 1.69 5:10 80577840 Rxc8 Nxc8 Rd7 Rb3 Rxe7 Rxb2 Nf6+ Kh8 Rxf7
> Bg7 Ne8 Nd6 Nxd6
>14 <= 1.92 7:29 115970639 Rxc8 Nxc8 Rd7 Rb3 Rxe7 Rxb2 Nf6+ Kh8 Rxf7
> Bg7 Ne8 Nd6 Nxd6
>14 <= 1.91 7:52 122387558 Rxc8 Nxc8 Rd7 Rb3 Rxe7 Rxb2 Nf6+ Kh8 Rxf7
> Bg7 Ne8 Nd6 Nxd6
>14 <= 1.88 8:09 127352184 Rxc8 Nxc8 Rd7 Rb3 Rxe7 Rxb2 Nf6+ Kh8 Rxf7
> Bg7 Ne8 Nd6 Nxd6
>14 <= 1.80 8:40 135938189 Rxc8 Nxc8 Rd7 Rb3 Rxe7 Rxb2 Nf6+ Kh8 Rxf7
> Bg7 Ne8 Nd6 Nxd6 c3 Rc7
>14 >= 1.70 8:56 140132021 Rxc8 Nxc8 Rd7 Rb3 Rxe7 Rxb2 Nf6+ Kh8 Rxf7
> Bg7 Ne8 Nd6 Nxd6 c3 Rc7
>14 >= 1.72 9:05 142626559 Rxc8 Nxc8 Rd7 Rb3 Rxe7 Rxb2 Nf6+ Kh8 Rxf7
> Bg7 Ne8 Nd6 Nxd6 c3 Rc7
>14 <= 1.77 9:30 149795113 Rxc8 Nxc8 Rd7 Rb3 Rxe7 Rxb2 Nf6+ Kh8 Rxf7
> Bg7 Ne8 Nd6 Nxd6 c3 Rc7
>14 <= 1.75 9:41 153441768 Rxc8 Nxc8 Rd7 Rb3 Rxe7 Rxb2 Nf6+ Kh8 Rxf7
> Bg7 Ne8 Nd6 Nxd6 c3 Rc7
>14 >= 1.73 9:49 155627275 Rxc8 Nxc8 Rd7 Rb3 Rxe7 Rxb2 Nf6+ Kh8 Rxf7
> Bg7 Ne8 Nd6 Nxd6 c3 Rc7
>14 >= 1.75 9:55 157332168 Rxc8 Nxc8 Rd7 Rb3 Rxe7 Rxb2 Nf6+ Kh8 Rxf7
> Bg7 Ne8 Nd6 Nxd6 c3 Rc7
>14 1.75 9:55 157332168 Rxc8 Nxc8 Rd7 Rb3 Rxe7 Rxb2 Nf6+ Kh8 Rxf7
> Bg7 Ne8 Nd6 Nxd6 c3 Rc7
>
>Tord
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