Author: Tord Romstad
Date: 09:08:23 07/27/03
Go up one level in this thread
On July 25, 2003 at 22:30:00, Matthew White wrote:
>On July 25, 2003 at 10:47:51, Tord Romstad wrote:
>
>>On July 24, 2003 at 16:42:31, Matthew White wrote:
>>
>>>I'm not sure if this one has been posted before, but even if it has, it's worth
>>>repeating. Position is from Timman - Kasparov (Linares 1992)
>>>
>>>[D]r1b2rk1/2pq2bp/2Np1np1/3Pp1P1/1P2pn2/2N1BP2/1KBQ3P/3R3R b - -
>>>
>>>Black to move.
>>>
>>>N6h5 Bxe4 cements White's light-squared control.
>>>Instead, Kasparov uncorked 21...N6xd5!! 22. Nxd5 Nd3+ 23. Bxd3 exd2 24. Nce7+
>>>Kh8 25. Nxc8 e4+
>>
>>Seems to be an easy position for chess programs. Gothmog finds the right move
>>at the third iteration after 0.05 seconds:
>>
>> 1 0.56 0.00 42 e4f3 e3f4 e5f4 g5f6 g7f6
>> 2 0.56 0.00 541 e4f3 e3f4 e5f4 g5f6 g7f6
>> 3 0.38 0.03 1799 e4f3 g5f6 g7f6 h1f1
>> 3 0.45 0.05 2551 f6d5 c3d5 e4f3 c6e7 g8h8 e3f4 e5f4 b2c1
>> 4 0.45 0.09 7692 f6d5 c3d5 e4f3 c6e7 g8h8 e3f4 e5f4 b2c1
>> 5 > 0.95 0.23 30193 f6d5 c3d5 e4f3 c6e7 g8h8 e3f4
>> 5 0.95 0.27 35365 f6d5 c3d5 e4f3 c6e7 g8h8 e3f4
>> 6 0.95 0.68 102615 f6d5 c3d5 e4f3 c6e7 g8h8 e3f4 e5f4 b2c1
>> a8a1 c2b1
>> 7 0.95 2.38 381571 f6d5 c3d5 e4f3 c6e7 g8h8 e3f4 e5f4 b2c1
>> a8a1 c2b1
>> 8 0.86 8.30 1343930 f6d5 c3d5 e4f3 c6a5 c8a6 e3f4 e5f4 d5f6
>> g7f6 g5f6 d7e6 c2b3
>> 9 0.91 28.62 4486167 f6d5 c3d5 e4f3 c6a5 f4e6 b2c1 c8a6 a5c6
>> a6e2 c6e7 g8h8
>>10 0.91 83.71 13873324 f6d5 c3d5 e4f3 c6a5 c8a6 e3f4 e5f4 d5f6
>> g7f6 g5f6 d7d8 b2b1 d8f6 d2d5 g8h8 d5f3
>>
>>Tord
>
>Keep running it for a while. Some of them play the sac early on, then change
>their minds. It's actually very difficult to find for the commercial engines
>that I tested it on...
After 30 minutes, the score has dropped slightly, but the program still
likes N6xd5:
1 0.56 0.00 42 e4f3 e3f4 e5f4 g5f6 g7f6
2 0.56 0.00 541 e4f3 e3f4 e5f4 g5f6 g7f6
3 0.38 0.01 1799 e4f3 g5f6 g7f6 h1f1
3 0.45 0.02 2551 f6d5 c3d5 e4f3 c6e7 g8h8 e3f4 e5f4 b2c1
4 0.45 0.05 7692 f6d5 c3d5 e4f3 c6e7 g8h8 e3f4 e5f4 b2c1
5 > 0.95 0.19 30193 f6d5 c3d5 e4f3 c6e7 g8h8 e3f4
5 0.95 0.23 35365 f6d5 c3d5 e4f3 c6e7 g8h8 e3f4
6 0.95 0.63 102615 f6d5 c3d5 e4f3 c6e7 g8h8 e3f4 e5f4 b2c1
a8a1 c2b1
7 0.95 2.35 381571 f6d5 c3d5 e4f3 c6e7 g8h8 e3f4 e5f4 b2c1
a8a1 c2b1
8 0.86 8.13 1343930 f6d5 c3d5 e4f3 c6a5 c8a6 e3f4 e5f4 d5f6
g7f6 g5f6 d7e6 c2b3
9 0.91 28.38 4486167 f6d5 c3d5 e4f3 c6a5 f4e6 b2c1 c8a6 a5c6
a6e2 c6e7 g8h8
10 0.91 81.87 13873324 f6d5 c3d5 e4f3 c6a5 c8a6 e3f4 e5f4 d5f6
g7f6 g5f6 d7d8 b2b1 d8f6 d2d5 g8h8 d5f3
11 0.84 217.95 37962092 f6d5 c3d5 e4f3 c6a5 c8a6 d5f6 g7f6 g5f6
a6e2 e3f4 e2d1 h1d1 e5f4 c2b3 g8h8 d2f4
12 0.80 1125.14 191481200 f6d5 c3d5 e4f3 d5f4 e5f4 e3d4 c8a6 d2c3
a6e2 d1e1 d6d5 b2c1 a8a2
The reason for the quick solution is probably just that my program is
less materialistic than it should be.
Tord
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