Author: Albert Silver
Date: 10:59:13 02/09/04
Go up one level in this thread
On February 09, 2004 at 13:33:35, Joachim Rang wrote:
>On February 09, 2004 at 12:29:09, John Merlino wrote:
>
>>On February 09, 2004 at 10:00:00, Albert Silver wrote:
>>
>>>Jose Garcia Ruvalcaba posted some correspondence games of his at CTF, including
>>>a loss in 1999 to Anatoly Sidenko. Sidenko came up with a superb move, that
>>>makes a good test position for today's super bots.
>>>
>>> Albert
>>>
>>>[D]r2r1b2/3b1k1p/2p2pp1/p3n3/R3NNP1/7P/PPP5/1KB1R3 w - - 0 30
>>>
>>>30. Nxf6!! Kxf6 31. g5+ Kf5 32. Nd5!
>>
>>Chessmaster 9000, SKR personality on a P4-2.4, needs almost 4 minutes to find
>>30.Nxf6. It doesn't find the full line above because it prefers 31...Kf7 for
>>Black.
>>
>>Time Depth Score Positions Moves
>>0:01 1/7 -0.26 257972 30.g5 Bb4 31.c3 c5 32.Nd6+ Kg8
>> 33.cxb4 Bxa4 34.bxc5
>>0:01 1/7 -0.08 293867 30.Bd2 Nf3 31.Re2 f5 32.gxf5 Bxf5
>> 33.Kc1 Nxd2 34.Rxd2 Rxd2 35.Kxd2
>>0:02 1/8 -0.26 436644 30.Bd2 Nf3 31.Rd1 f5 32.gxf5 gxf5
>> 33.Bxa5 Rxa5 34.Ng5+ Nxg5 35.Rxa5
>>0:03 1/8 -0.11 649976 30.g5 Nf3 31.Rf1 c5 32.Ra3 Nxg5
>> 33.Nxg5+ fxg5 34.Ne2+ Kg8 35.Bxg5
>> Re8
>>0:06 1/9 -0.30 1184350 30.g5 Nf3 31.Rf1 c5 32.Ra3 f5 33.Raxf3
>> fxe4 34.Re3 Bf5
>>0:12 1/9 -0.20 2471512 30.Rf1 Bb4 31.Ne2 c5 32.Rxf6+ Kg7
>> 33.Rxb4 axb4 34.N2g3 h6 35.Be3
>>0:26 1/10 -0.25 5211831 30.Rf1 Be7 31.Ne2 c5 32.Ra3 Bc6
>> 33.N2g3 Bb5 34.Rf2 a4
>>0:36 1/10 -0.08 7404621 30.g5 Nf3 31.Rf1 c5 32.Ra3 Nxg5
>> 33.Nxg5+ fxg5 34.Nh5+ Bf5 35.Bxg5
>> Be7 36.Bxe7 Kxe7
>>0:58 1/11 -0.07 11866493 30.g5 Bb4 31.c3 c5 32.Nd6+ Kg8
>> 33.cxb4 Bxa4 34.bxc5 Nf3 35.Re7
>> Nxg5 36.Nd5
>>2:17 1/12 -0.41 29014096 30.g5 Bb4 31.Re2 c5 32.Rxb4 axb4
>> 33.gxf6 Bb5 34.Re3 Rac8 35.b3 h6
>> 36.a4
>>3:55 1/12 0.31 51993673 30.Nxf6 Kxf6 31.g5+ Kf7 32.Rxe5
>> Bb4 33.a3 c5 34.axb4 Bxa4 35.b3
>> Bd7 36.bxc5 a4
>>6:01 2/13 0.07 81179162 30.Nxf6 Kxf6 31.g5+ Kf7 32.Rxe5
>> Bb4 33.a3 c5 34.axb4 Bxa4 35.b3
>> Bd7 36.bxc5 Bc6 37.Re6 Rac8
>>
>>Here is what it says after forcing 30.Nxf6 Kxf6 31.g5+:
>>
>>Time Depth Score Positions Moves
>>0:00 1/5 -1.19 22669 31...Kf5 32.Rf1 c5 33.Nd3+ Ke6
>> 34.Re4 Bd6
>>0:00 1/6 -0.91 58777 31...Kf5 32.Ne2 Ke6 33.Nf4+ Kd6
>> 34.Rd4+ Kc5 35.Rdd1 Nf3
>>0:01 1/7 -1.18 221951 31...Kf5 32.Rf1 Bb4 33.Nd5+ Ke6
>> 34.Nc7+ Ke7 35.Nxa8 Rxa8 36.h4
>> Rf8 37.Rxf8 Kxf8
>>0:03 1/8 -0.34 732207 31...Kf5 32.Nd5 Bb4 33.Nxb4 axb4
>> 34.Rxb4 Ke6 35.Rh4 c5 36.Rxh7 Bc6
>>0:05 1/9 -0.27 1221888 31...Kf5 32.Nd5 Bb4 33.Nxb4 axb4
>> 34.Rxb4 Ra5 35.Rbe4 Re8 36.Bd2 Raa8
>>0:14 1/10 -0.14 3292467 31...Kf5 32.Nd5 Bb4 33.Nxb4 axb4
>> 34.Rxb4 Ra5 35.Rf4+ Ke6 36.Bd2
>> Rd5 37.Bc3 Bc8
>>0:46 1/11 0.50 10886296 31...Kf5 32.Nd5 Bb4 33.Nxb4 axb4
>> 34.Rxb4 Be8 35.Rf4+ Ke6 36.Rf6+
>> Kd5 37.b3 Nf7 38.Re7 Kc5 39.Be3+
>> Kb5 40.Rfxf7 Bxf7 41.Rxf7
>>0:56 1/11 0.27 12970164 31...Kf7 32.Rxe5 Bb4 33.a3 c5 34.axb4
>> Bxa4 35.b3 Bd7 36.bxc5 Re8 37.Bb2
>> Rxe5 38.Bxe5
>>1:05 1/12 0.06 14886616 31...Kf7 32.Rxe5 Bb4 33.a3 c5 34.axb4
>> Bxa4 35.b3 Bd7 36.bxc5 Bc6 37.Re6
>> Rac8
>>1:31 2/13 0.11 21101857 31...Kf7 32.Rxe5 Bb4 33.a3 c5 34.axb4
>> Bxa4 35.b3 Bd7 36.bxc5 Re8 37.Bb2
>> Bc6
>>3:12 3/14 0.06 42066786 31...Kf7 32.Rxe5 Bb4 33.a3 c5 34.axb4
>> Bxa4 35.b3 Bd7 36.bxc5 Re8 37.Bb2
>> Bc6 38.Bc3 Rxe5 39.Bxe5
>>6:59 4/15 0.06 95455632 31...Kf7 32.Rxe5 Bb4 33.a3 c5 34.axb4
>> Bxa4 35.b3 Bd7 36.bxc5 a4 37.b4
>> Ra7 38.Nd5 Bxh3 39.b5
>>
>>jm
>
>
>This confirms my hypothesis, that there is no forced win after Nxf6 and that the
>position after 31...Kf7 is about equal.
>
>regards Joachim
Yes, I can't find any improvement, and only really analyzed Kf5. 30. Nxf6 is
still the move to play though as other moves seem much worse.
Albert
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