Author: Uri Blass
Date: 14:04:16 09/04/01
Go up one level in this thread
On September 04, 2001 at 16:18:23, José Antônio Fabiano Mendes wrote: >On September 04, 2001 at 15:39:43, Robert Hyatt wrote: > >>On September 04, 2001 at 15:03:24, José Antônio Fabiano Mendes wrote: >> >>> By the way,speaking of blocked positions,I would like to call >>> your attention to the game Quest-Pharaon,Maastricht 2001: >>> [D]8/rrpb2k1/5q2/pP1Pp1p1/P3Pp1p/2RB1P1P/1Q4PK/2R5 b >>> And here Black played 42...Qe7,White replied 43.d6 and won quickly. >>> Why did Pharaon fail to play 42...Qd6,keeping the position blocked? >>> Is it such a difficult move for a chess program to find? Regards,JAFM >> >> >>That is a different problem altogether. Trying to prevent a position from >>becoming blocked is a tough problem. Teaching a computer how/when to block >>a position is even more complex. >> >>However, if you play Qd6 can't white respond with Rc6 and push her out of >>there? > > That's right,maybe Black is lost already,but at least White > would be forced to sac the exchange to try to penetrate. and I can add that at least Deep Fritz is going to miss Rc6 The problem here is not to see the fact that black cannot take the rook but to see that after Rc6 Qe7 the rook at c6 does not need to go back. Here is Crafty's analysis New position 8/rrpb2k1/3q4/pP1Pp1p1/P3Pp1p/2RB1P1P/1Q4PK/2R5 w - - 0 1 Analysis by Crafty 18.10: 2.Qf2 +- (1.99) Depth: 1/6 00:00:00 2.Qf2 Ra8 +- (1.59) Depth: 2/6 00:00:00 2.Qf2 Ra8 3.Kg1 +- (1.70) Depth: 3/8 00:00:00 2.Qc2 Kg8 3.Kg1 +- (1.97) Depth: 3/8 00:00:00 2.Qc2 Kh7 3.Kg1 Kg8 +- (1.97) Depth: 4/10 00:00:00 2.Qc2 Kh7 3.Kh1 Kg8 4.Kg1 +- (1.97) Depth: 5/10 00:00:00 2.Qc2 Kg8 3.Kg1 Qb6+ 4.Rc5 Ra8 5.Qc4 +- (1.89) Depth: 6/12 00:00:00 26kN 2.Qc2 Kg8 3.Rc5 Qb6 4.Qc4 Qd6 5.Kg1 +- (1.84) Depth: 7/16 00:00:00 58kN 2.Qc2 Kg8 3.Rc5 Qb6 4.Qc4 Qf6 5.Kg1 Qd6 +- (1.84) Depth: 8/17 00:00:00 106kN 2.Rc4 Rb8 3.Qc3 Rc8 4.b6 Qxb6 5.Qxe5+ Qf6 6.Qxf6+ Kxf6 7.Re1 +- (1.91) Depth: 8/17 00:00:01 372kN 2.Rc4 Kg8 3.Qc3 Qf6 4.Kg1 Qb6+ 5.Rc5 Qf6 6.Qc4 Qd6 +- (1.84) Depth: 9/21 00:00:02 550kN 2.Rc4 Kg8 3.Qc3 Qf6 4.Be2 Qd6 5.Kg1 Qb6+ 6.Kf1 Qd6 7.Kg1 +- (1.90) Depth: 10/21 00:00:02 940kN 2.Rc4 Kg8 3.Qc3 Be8 4.Kg1 Bd7 +- (1.84) Depth: 11/22 00:00:04 1770kN 2.Rc4 Kg8 3.Qc3 Be8 4.Kg1 Bd7 5.Rc5 Qe7 6.Qc4 Qd6 7.Rc3 Qe7 +- (1.86) Depth: 12/27 00:00:08 3249kN 2.Rc4 Kg8 3.Qc3 Kg7 4.Be2 Kg8 +- (1.91) Depth: 13/30 00:00:23 9901kN 2.Rc4 Rb6 3.Kh1 Kg8 4.Qc3 Rbb7 5.Kh2 +- (1.92) Depth: 14/33 00:01:42 46185kN 2.Rc4 Rb6 3.Qc3 Rbb7 4.Be2 Kf6 5.Rc2 Kg7 6.Kg1 Kf6 7.Qd2 Ra8 8.Qc1 Rc8 9.Qd2 +- (1.89) Depth: 15/35 00:03:11 86861kN 2.Rc6 Qe7 3.R1c5 Kh7 4.Qc3 Bxc6 5.dxc6 Rb8 6.Rxe5 Qb4 7.Qc2 Rd8 8.Rxg5 Qd4 9.Bc4 +- (2.13) Depth: 15/35 00:04:43 130660kN (Blass, Tel-aviv 04.09.2001) Junior7 can find Rc6 for the wrong reasons and later changes it's mind New position 8/rrpb2k1/3q4/pP1Pp1p1/P3Pp1p/2RB1P1P/1Q4PK/2R5 w - - 0 1 Analysis by Junior 7: 2.b6 Rxb6 3.Bb5 Bxb5 ² (0.58) Depth: 3 00:00:00 2.Bf1 Rb8 ± (1.31) Depth: 3 00:00:00 2.R3c2 Rb8 +- (1.42) Depth: 3 00:00:00 2.R3c2 Rb8 3.Qc3 ± (1.21) Depth: 6 00:00:00 1kN 2.R3c2 Rb6 3.Qc3 Rb8 4.Kg1 ± (1.21) Depth: 9 00:00:00 13kN 2.Rc6 Qe7 3.R6c2 Qe8 4.Qc3 Rb8 +- (1.46) Depth: 9 00:00:00 73kN 2.Rc6 Qe7 3.R6c2 Qd6 4.Qc3 Rb8 5.Kg1 ± (1.21) Depth: 12 00:00:00 469kN 2.Rc4 Kh8 3.Kh1 Ra8 4.Qc3 Rc8 5.Qxa5 ± (1.32) Depth: 12 00:00:01 714kN 2.R3c2 Kh8 3.Qc3 Ra8 4.Kh1 Rab8 5.Qxa5 ± (1.36) Depth: 12 00:00:01 836kN 2.R3c2 Kg8 3.Qc3 Be8 4.Bc4 ± (1.27) Depth: 15 00:00:04 2790kN 2.Rc6 Qe7 3.R6c5 Qd6 4.Qc3 Kh8 5.Kh1 Kh7 ± (1.35) Depth: 15 00:00:10 6695kN 2.Rc6 Qe7 3.R6c5 Qd6 4.Qc3 Be8 5.Rc4 Bd7 6.Bf1 ± (1.27) Depth: 17 00:00:27 16625kN 2.R3c2 Qe7 3.d6 Qxd6 4.Rd2 Qd4 ± (1.30) Depth: 17 00:00:42 26664kN 2.Rc5 Kh7 3.Kh1 Kh8 4.Qc3 Kg7 5.Qd2 ± (1.33) Depth: 17 00:01:44 68323kN 2.Rc5 Kh7 3.Kh1 Kh8 4.Qa1 Qe7 5.R5c2 Qd6 ± (1.30) Depth: 18 00:02:11 85931kN 2.Rc4 Kh7 3.Qa1 Kh8 4.Be2 Be8 5.Qc3 Qe7 6.Bd3 ± (1.31) Depth: 18 00:03:06 121144kN 2.Rc4 Kh7 3.Bf1 Be8 4.Qc3 Kh8 5.Be2 Kg8 ± (1.31) Depth: 19 00:04:15 163172kN (Blass, Tel-aviv 04.09.2001) New position 8/rrpb2k1/3q4/pP1Pp1p1/P3Pp1p/2RB1P1P/1Q4PK/2R5 w - - 0 1 Gambittiger also can see nothing Analysis by Gambit Tiger 2.0: 2.Rc5 Qe7 3.Qc3 Be8 4.Kg1 +- (3.06) Depth: 9 00:00:00 92kN 2.Rc5 Qe7 3.Qc3 Be8 4.Kg1 Kg8 5.Kf1 Bg6 6.Rc6 +- (3.04) Depth: 9 00:00:00 125kN 2.Rc5 Qe7 3.Qc3 Be8 4.Kg1 Kg8 5.Kf1 Kg7 6.Kf2 Bd7 +- (3.02) Depth: 10 00:00:01 261kN 2.Rc5 Qe7 3.Qc3 Be8 4.Kg1 Kg8 5.Kf1 Qg7 6.Kf2 Bg6 7.Rc6 +- (3.04) Depth: 11 00:00:02 464kN 2.Rc5 Qe7 3.Qc3 Be8 4.Kg1 Kg8 5.Kf1 Qg7 6.Bb1 Bg6 7.Rc6 Bh7 +- (3.04) Depth: 12 00:00:03 826kN 2.Rc5 Qe7 3.Qc3 Be8 4.Kg1 Kg8 5.Kf1 Qg7 6.Bb1 Bg6 7.Rc6 Bf7 8.Ba2 +- (3.04) Depth: 13 00:00:07 1663kN 2.Rc5 Qe7 3.Qc3 Be8 4.Kg1 Kg8 5.Kf1 Qf6 6.Bb1 Kh7 7.Kf2 Qe7 8.Ba2 Bd7 +- (3.02) Depth: 14 00:00:20 4739kN 2.Rc5 Qe7 3.Qc3 Be8 4.Kg1 Kg8 5.Kf1 Qf6 6.Bb1 Kg7 7.Ba2 Qd6 8.Rc2 Bg6 9.Rc6 +- (3.02) Depth: 15 00:00:44 10309kN 2.Rc5 Qe7 3.Qc3 Be8 4.Kg1 Kg8 5.Kf1 Qf6 6.Bb1 Kg7 7.Ba2 Qd6 8.Rc2 Bg6 9.Rc6 Qe7 +- (3.02) Depth: 16 00:01:50 26445kN 2.Rc5 Qe7 3.Qc3 Be8 4.Kg1 Kg8 5.Kf1 Qf6 6.Bb1 Kg7 7.Ba2 Qd6 8.Rc2 Qe7 9.Kf2 Bg6 10.Rc6 +- (3.02) Depth: 17 00:04:11 61213kN (Blass, Tel-aviv 04.09.2001) Uri
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