Author: John Merlino
Date: 09:17:15 08/26/05
Go up one level in this thread
On August 26, 2005 at 08:14:21, Gian-Carlo Pascutto wrote: >[D]2r2k2/5pp1/1p1p1q1p/p1rRpP2/2PbP3/PP4P1/3QB1KP/2R5 b - - > >Zappa played 27. .. Ke7, which looks funny, but is not bad. In fact, against >Deep Sjeng (and countless other programs) it is the winning move. Like a red lap >against a bull, Deep Sjeng replied with b4?? which is losing. Black's king looks >exposed in the center but is in reality unassainable, instead *white* must be >careful. Zappa must have seen it because the score went up immediately after b4. > >White can at least draw with 28. a4. > >Your mission is: avoid 28. b4 CM9_R1 on a P4-2.4 switches from a4 to h4 in just over two minutes: Time Depth Score Positions Moves 0:00 1/4 0.71 1775 2.b4 Rxd5 3.cxd5 Rxc1 4.Qxc1 axb4 5.axb4 0:00 1/5 0.71 6862 2.b4 Rxd5 3.cxd5 Rxc1 4.Qxc1 axb4 5.axb4 0:00 1/6 0.71 25656 2.b4 axb4 3.axb4 Rxd5 4.cxd5 Rxc1 5.Qxc1 0:00 1/7 0.84 63042 2.b4 axb4 3.axb4 Rxd5 4.cxd5 Rxc1 5.Qxc1 g6 6.Qxh6 gxf5 0:00 1/8 0.84 121542 2.b4 axb4 3.axb4 Rxd5 4.cxd5 Rxc1 5.Qxc1 g6 6.Qxh6 gxf5 0:01 1/9 0.67 322622 2.b4 axb4 3.axb4 R5c7 4.h3 Qg5 5.Qxg5+ hxg5 6.Rb1 Ra7 7.Rb3 0:04 1/10 0.70 857716 2.b4 axb4 3.axb4 R5c7 4.Rc2 Qg5 5.Rxd4 exd4 6.Qxd4 Kf8 7.Qxd6+ Qe7 8.Rd2 Qxd6 9.Rxd6 0:10 1/11 0.43 2237652 2.b4 axb4 3.axb4 R5c7 4.Rc2 g6 5.Qd3 Ra7 6.Bd1 Qg5 7.Rxd4 exd4 8.Qxd4 0:29 1/12 0.41 6345513 2.b4 axb4 3.axb4 R5c7 4.Rc2 g6 5.Rc1 gxf5 6.exf5 Ra7 7.Bg4 Ra3 8.Re1 1:06 1/13 0.26 14566219 2.b4 axb4 3.axb4 R5c7 4.Rc2 g6 5.Bd3 gxf5 6.exf5 Qg5 7.Qd1 Ra7 8.h4 Qe3 9.f6+ Kxf6 2:06 1/13 0.30 27052976 2.h4 Kf8 3.b4 axb4 4.axb4 Rxd5 5.cxd5 Ra8 6.Bb5 Qd8 7.Qd3 Ra2+ 8.Rc2 Qa8 9.Qe2 7:10 2/14 0.22 93672540 2.h4 Ra8 3.Rh1 Rac8 4.g4 g5 5.Rxc5 dxc5 6.hxg5 Qxg5 7.Qxg5+ hxg5 8.Rh6 f6 9.Rh7+ Kd6 10.Rf7 >[D]3k4/6p1/3p1pP1/4pP2/3bP2q/r2B1Q1p/7P/3R3K w - - > >49. Rb1 loses instantly because after Rc3, white is in zugzwang! Deep Sjeng >could not avoid it because of that. Can your program (and does it understand >what is happening)? The King avoids Rb1 in less than a second, although it's not very happy anyway: Time Depth Score Positions Moves 0:00 1/4 -1.01 2359 1.Qe2 Qf4 2.Rf1 Qg5 3.Bb5 0:00 1/4 -0.98 3479 1.Rb1 Qf4 2.Qxh3 Qxe4+ 3.Bxe4 Rxh3 4.Rb7 0:00 1/5 -1.11 18335 1.Rb1 Rc3 2.Rb8+ Kc7 3.Rb1 Qf4 4.Qxh3 Qxe4+ 5.Bxe4 Rxh3 0:00 1/6 -1.28 43995 1.Rb1 Ra2 2.Rb8+ Kc7 3.Rb1 Qg5 4.Qxh3 Rb2 0:00 1/6 -1.07 55229 1.Qe2 Qf4 2.Rf1 Qg5 3.Bc4 Re3 0:00 1/7 -1.24 112196 1.Qe2 Qf4 2.Rf1 Qg5 3.Bb5 Rb3 4.Bc6 Ke7 0:01 1/8 -1.23 303049 1.Qe2 Rb3 2.Bc2 Re3 3.Qd2 Rc3 4.Qe2 Qf4 5.Bd3 0:03 1/9 -1.32 700839 1.Qe2 Rb3 2.Bc2 Re3 3.Qd2 Rc3 4.Bd3 Qg4 5.Qe2 0:05 1/10 -1.33 1241701 1.Qe2 Rb3 2.Bc2 Re3 3.Qd2 Rc3 4.Bd3 Qg4 5.Qe2 Qf4 6.Rf1 Qg5 0:14 1/11 -1.48 3348950 1.Qe2 Qf4 2.Rf1 Qg5 3.Bc4 Rc3 4.Ba6 Rc1 5.Rxc1 Qxc1+ 6.Qf1 Qc6 7.Qe2 d5 0:28 1/12 -1.35 6756459 1.Qe2 Qf4 2.Rf1 Qg5 3.Bc4 Re3 4.Qa2 Qg2+ 5.Qxg2 hxg2+ 6.Kxg2 Rxe4 7.Kf3 Rh4 8.Kg3 1:05 2/13 -1.41 16251796 1.Qe2 Qf4 2.Rf1 Qg5 3.Bc4 Re3 4.Qa2 Qg2+ 5.Qxg2 hxg2+ 6.Kxg2 Rxe4 7.Kg3 Bc3 8.Bd5 Rd4 9.Bf3 After forcing Rc1, it sees a winning score for Black with Rc3 in seven seconds: Time Depth Score Positions Moves 0:00 1/4 -1.12 9760 1...Qh6 2.Qe2 Qg5 3.Bc4 Rc3 0:00 1/5 -1.13 23179 1...Qh6 2.Qe2 Qf4 3.Bc4 Re3 4.Rb8+ Kc7 0:00 1/5 -1.40 33829 1...Ra2 2.Rb8+ Kc7 3.Rb1 Qg5 4.Qxh3 Rb2 0:00 1/6 -1.30 77474 1...Ra2 2.Be2 Rc2 3.Ba6 Qf4 4.Rb8+ Ke7 5.Rb7+ Kf8 6.Qxf4 exf4 0:00 1/6 -1.50 106258 1...d5 2.Rf1 dxe4 3.Qxe4 Qxe4+ 4.Bxe4 Ra2 5.Rd1 Re2 0:00 1/7 -1.39 133062 1...d5 2.Rf1 dxe4 3.Qxe4 Qxe4+ 4.Bxe4 Ra2 5.Rd1 Ke7 6.Bf3 0:01 1/8 -1.45 251581 1...d5 2.Rf1 dxe4 3.Qxe4 Qxe4+ 4.Bxe4 Ra2 5.Rb1 Bc3 6.Rb7 Re2 0:03 1/9 -1.44 662678 1...d5 2.Rf1 dxe4 3.Qxe4 Qxe4+ 4.Bxe4 Ra2 5.Rb1 Kd7 6.Rb7+ Kd6 7.Bd3 0:03 1/9 -1.57 891545 1...Rc3 2.Ra1 Rb3 3.Rf1 Ke7 4.Qe2 Qg5 5.Bc4 Rb2 0:07 1/10 -5.41 1857999 1...Rc3 2.Qe2 Qg5 3.Bc4 Qg2+ 4.Qxg2 hxg2+ 5.Kxg2 Rxc4 6.Rb8+ Rc8 7.Rxc8+ Kxc8 8.Kf3 Kd7 9.h4 Kc6 0:12 1/11 -5.04 3395443 1...Rc3 2.Qg3 Qxg3 3.hxg3 Rxd3 4.Rb8+ Kc7 5.Rg8 Rxg3 6.Rxg7+ Kc6 7.Rf7 Rg4 8.Rxf6 Rxe4 0:26 1/12 -4.40 7216285 1...Rc3 2.Qf1 Qg4 3.Rb8+ Kd7 4.Rb7+ Kc6 5.Rb8 Bc5 6.Rc8+ Kd7 7.Rxc5 Rxc5 8.Bb5+ Ke7 9.Bd3 d5 10.exd5 Rxd5 jm
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