Author: Uri Blass
Date: 10:04:15 11/15/01
This position is from the game palmtiger-TSCP Tiger is 2 pawns down but it wants to trade queens and happy about it and only after a long time changes it's mind to the better move Bc1 that also wins a pawn thanks to acomplicated tactics. Chess Tiger 14.6 - TSCP 1.73 [D]2kn3r/ppp4p/4p1pB/1P2pr2/2B5/q1bP4/2R2PPP/3Q1RK1 w - - 0 1 Analysis by Gambit Tiger 2.0: 21.Qc1 Qxc1 22.Rfxc1 Bd4 23.Bb3 Bb6 24.Bg7 Rg8 ± (0.98) Depth: 8 00:00:00 81kN 21.Qc1 Qxc1 22.Rfxc1 Bd4 23.Bb3 Bb6 24.Be3 Kd7 25.Bxb6 cxb6 ± (0.98) Depth: 8 00:00:00 83kN 21.Qc1 Qxc1 22.Rfxc1 Bd4 23.Bb3 Bb6 24.Be3 Rf7 25.Bc5 Bxc5 26.Rxc5 ± (0.92) Depth: 9 00:00:01 191kN 21.Qc1 Qxc1 22.Rfxc1 Bd4 23.Bb3 Bb6 24.Be3 Rf7 25.Bg5 Rhf8 26.Bh4 ± (0.74) Depth: 10 00:00:03 653kN 21.Qc1 Qxc1 22.Rfxc1 Bd4 23.Bb3 Bb6 24.Be3 Rf7 25.Bg5 Rhf8 26.Bh4 Kd7 ± (0.74) Depth: 11 00:00:07 1498kN 21.Qc1 Qxc1 22.Rfxc1 Bd4 23.Bb3 Kb8 24.Be3 Bxe3 25.fxe3 Rhf8 26.Rxc7 Rf1+ 27.Rxf1 Rxf1+ 28.Kxf1 Kxc7 ± (0.72) Depth: 12 00:00:15 3139kN 21.Bc1 Qa5 22.b6 axb6 23.Ra2 Qc5 24.Bxe6+ Nxe6 25.Ra8+ Kd7 26.Rxh8 Nf8 27.Qa4+ Ke7 28.Qh4+ Kd7 29.Be3 ± (1.06) Depth: 12 00:00:27 5485kN (Blass, Tel-aviv 15.11.2001) other programs like Junior and Fritz has not the problem of avoiding Qc1 Note that Ra2 wins material thanks to simple tactics Ra2 Qc5(forced to defend a7) Qb3 Bc1 also wins material as yace only material version confirms very fast. Bc1 Qa5 b6 or Bc1 Qb4 Ra2 are strong for white. in the last line black can lose the queen after Kb8 when after Qc5 Rc2 the queen needs to go back to the first place in order to avoid losing material(Qd4 Be3 win the bishop when the bishop cannot escape because Bxe6+ win the queen I wonder what is the reason that tiger when it is 2 pawns down want to trade queens and not to win a pawn? At leat winning the pawn by Ra1 is easy to find. Here is analysis of yace only material of the position after Qc1 and the position after some alternatives(bishop=3.5 knight=3.4 pawn=0.8) after Be3 Chess Tiger 14.6 - TSCP 1.73 2kn3r/ppp4p/4p1p1/1P2pr2/2B5/q1bPB3/2R2PPP/3Q1RK1 b - - 0 1 Analysis by Yace 0.99.56: 21...Qa4 22.Rxc3 +- (2.00) Depth: 1 00:00:04 21...Qa5 -+ (-1.50) Depth: 1 00:00:04 21...Qa5 -+ (-1.50) Depth: 1 00:00:04 21...Qa5 22.Bxa7 -+ (-1.50) Depth: 2 00:00:04 21...Qa5 22.Ra2 Qb4 23.Bxa7 ³ (-0.70) Depth: 3 00:00:04 21...Qa5 22.Ra2 Qb4 ³ (-0.70) Depth: 3 00:00:04 21...Bd4 22.Bg5 µ (-0.80) Depth: 3 00:00:04 21...Bd4 22.Bxd4 exd4 -+ (-1.50) Depth: 3 00:00:04 21...Bd4 22.Bxd4 exd4 23.Ra2 Qc5 -+ (-1.50) Depth: 4 00:00:04 21...Bd4 22.Bxd4 exd4 23.Ra2 Qc5 24.Re2 -+ (-1.50) Depth: 5 00:00:04 5kN 21...Bd4 22.Bxd4 exd4 23.Ra2 Qc5 24.Re2 Rff8 -+ (-1.50) Depth: 6 00:00:04 24kN 21...Bd4 22.Bxd4 exd4 23.Ra2 Qc5 24.Re2 Rff8 25.f3 -+ (-1.50) Depth: 7 00:00:04 79kN 21...Bd4 22.Bxd4 exd4 23.Ra2 Qc5 24.Re2 Rff8 25.f3 Kb8 -+ (-1.50) Depth: 8 00:00:04 235kN 21...Bd4 22.Bxd4 exd4 23.Ra2 Qc5 24.Re2 Rff8 25.f3 Kb8 26.Kh1 -+ (-1.50) Depth: 9 00:00:05 741kN 21...Bd4 22.Bxd4 exd4 23.Ra2 Qc5 24.Re2 Rff8 25.f3 Kb8 26.Kh1 Rfg8 -+ (-1.50) Depth: 10 00:00:07 1539kN 21...Bd4 22.Bxd4 exd4 23.Ra2 Qc5 24.Qa4 Kb8 25.Rfa1 Nc6 26.bxc6 bxc6 µ (-1.10) Depth: 11 00:00:10 3359kN 21...Bd4 22.Bxd4 exd4 23.Ra2 Qc5 24.Qa4 Kb8 25.Rfa1 Rff8 26.Qxa7+ Qxa7 27.Rxa7 c6 ³ (-0.70) Depth: 11 00:00:13 5150kN 21...Bd4 22.Bxd4 exd4 23.Ra2 Qc5 24.Qa4 Kb8 25.Rfa1 Rff8 26.Qxa7+ Qxa7 27.Rxa7 c6 28.bxc6 bxc6 ³ (-0.70) Depth: 12 00:00:37 19648kN 21...Bd4 22.Bxd4 exd4 23.Ra2 Qc5 24.Qa4 Kb8 25.Rfa1 Rff8 26.Qxa7+ Qxa7 27.Rxa7 c6 28.bxc6 bxc6 29.Bb3 ³ (-0.70) Depth: 13 00:01:55 63798kN (Blass, Tel-aviv 15.11.2001) after Ra2 Chess Tiger 14.6 - TSCP 1.73 2kn3r/ppp4p/4p1pB/1P2pr2/2B5/q1bP4/R4PPP/3Q1RK1 b - - 0 1 Analysis by Yace 0.99.56: 21...Qxa2 22.Bxa2 +- (3.51) Depth: 1 00:00:00 21...Qb4 22.Rxa7 ³ (-0.70) Depth: 1 00:00:00 21...Qc5 -+ (-1.50) Depth: 1 00:00:00 21...Qc5 22.Re2 -+ (-1.50) Depth: 2 00:00:00 21...Qc5 22.Qb3 Qd4 23.Bxe6+ Nxe6 24.Qxe6+ µ (-0.80) Depth: 3 00:00:00 21...Qc5 22.Qb3 Qd4 µ (-0.80) Depth: 3 00:00:00 21...Qc5 22.Qb3 Qd4 23.Bxe6+ Nxe6 µ (-0.80) Depth: 4 00:00:00 21...Qc5 22.Qb3 Bd4 23.Bxe6+ Nxe6 24.Qxe6+ Kd8 25.Qc4 µ (-0.80) Depth: 5 00:00:00 14kN 21...Qc5 22.Qb3 Bd4 23.Bxe6+ Nxe6 24.Qxe6+ Kb8 25.Bg7 Rc8 µ (-0.80) Depth: 6 00:00:00 40kN 21...Qc5 22.Qb3 Bd4 23.Bxe6+ Nxe6 24.Qxe6+ Kb8 25.Bg7 Rc8 26.Qc4 Qxc4 µ (-0.80) Depth: 7 00:00:00 61kN 21...Qc5 22.Qb3 Bd4 23.Bxe6+ Nxe6 24.Qxe6+ Kb8 25.Bg7 Rc8 26.Qc4 Qxc4 27.dxc4 µ (-0.80) Depth: 8 00:00:00 422kN 21...Qc5 22.Qb3 Bd4 23.Bxe6+ Nxe6 24.Qxe6+ Kb8 25.Bg7 Rc8 26.Qc4 Qxc4 27.dxc4 Rf7 µ (-0.80) Depth: 9 00:00:02 676kN 21...Qc5 22.Qb3 Bd4 23.Bxe6+ Nxe6 24.Qxe6+ Kb8 25.Bg7 Rc8 26.Qc4 Qxc4 27.dxc4 Rf7 28.Bh6 µ (-0.80) Depth: 10 00:00:06 3076kN 21...Qc5 22.Be3 Bd4 23.Bxd4 Qxd4 24.Qa1 Qxa1 25.Rfxa1 Kd7 26.Rxa7 Rhf8 27.R7a2 R5f7 ³ (-0.70) Depth: 11 00:00:16 9660kN 21...Qc5 22.Be3 Bd4 23.Bxd4 Qxd4 24.Qa1 Qxa1 25.Rfxa1 Kd7 26.Rxa7 Rhf8 27.R7a2 R5f7 28.Rb2 ³ (-0.70) Depth: 12 00:00:48 28089kN 21...Qc5 22.Be3 Bd4 23.Bxd4 Qxd4 24.Qa1 Qxa1 25.Rfxa1 Kd7 26.Rxa7 Rhf8 27.R7a2 R5f7 28.Rb2 c6 ³ (-0.70) Depth: 13 00:02:21 79333kN (Blass, Tel-aviv 15.11.2001) After Bc1 Chess Tiger 14.6 - TSCP 1.73 2kn3r/ppp4p/4p1p1/1P2pr2/2B5/q1bP4/2R2PPP/2BQ1RK1 b - - 0 1 Analysis by Yace 0.99.56: 21...Qxc1 22.Rxc1 +- (5.01) Depth: 1 00:00:00 21...Qa5 -+ (-1.50) Depth: 1 00:00:00 21...Qa5 22.Ba2 -+ (-1.50) Depth: 2 00:00:00 21...Qa5 22.Ba2 Qa4 -+ (-1.50) Depth: 3 00:00:00 21...Qa5 22.Ra2 Qb6 23.Be3 Bd4 24.Bxd4 exd4 25.Qa4 Kb8 26.Rfa1 ³ (-0.70) Depth: 4 00:00:00 21...Qa5 22.Ra2 Qb6 23.Bh6 Kd7 24.Be3 Bd4 25.Rxa7 ³ (-0.70) Depth: 4 00:00:00 21...Qb4 22.Ra2 Kb8 23.Rxa7 Kxa7 24.Be3+ Bd4 25.Bxd4+ exd4 26.b6+ cxb6 27.Qa1+ Kb8 µ (-0.71) Depth: 4 00:00:00 21...Qb4 22.Ra2 Kb8 23.Be3 -+ (-1.50) Depth: 4 00:00:00 21...Qb4 22.Ra2 Kb8 23.Be3 Bd4 -+ (-1.50) Depth: 5 00:00:00 8kN 21...Qb4 22.Ra2 Kb8 23.Be3 Bd4 24.Bxd4 -+ (-1.50) Depth: 6 00:00:00 17kN 21...Qb4 22.Ra2 Kb8 23.Ba3 Qxa3 24.Rxa3 Rf7 µ (-1.10) Depth: 7 00:00:00 53kN 21...Qb4 22.Ra2 Bd4 23.Ba3 Qa5 24.Bc5 Qc3 25.Bxd4 exd4 26.Rxa7 ³ (-0.70) Depth: 7 00:00:00 53kN 21...Qb4 22.Ra2 Bd4 23.Ba3 Qa5 24.Bc5 Qc3 25.Bxd4 exd4 26.Rxa7 ³ (-0.70) Depth: 8 00:00:00 234kN 21...Qb4 22.Ra2 Bd4 23.Ba3 Qa5 24.Bc5 Qc3 25.Bxd4 exd4 26.Rxa7 ³ (-0.70) Depth: 9 00:00:01 573kN 21...Qb4 22.Ra2 Qd6 23.Rxa7 Bd4 24.Ba3 Qb6 25.Ra8+ Kd7 26.Qc2 Rf7 ³ (-0.70) Depth: 10 00:00:02 1287kN 21...Qb4 22.Ra2 Qd6 23.Rxa7 Bd4 24.Ba3 Qb6 25.Ra8+ Kd7 26.Qc2 Rf7 27.Qa2 ³ (-0.70) Depth: 11 00:00:07 4333kN 21...Qb4 22.Ra2 Qd6 23.Rxa7 Bd4 24.Ba3 Qb6 25.Ra8+ Kd7 26.Qc2 Rf7 27.Qa2 Re8 ³ (-0.70) Depth: 12 00:00:22 12953kN 21...Qb4 22.Ra2 Qd6 23.Rxa7 Bd4 24.Ba3 Qb6 25.Ra8+ Kd7 26.Qc2 Rf7 27.Qa2 Re8 28.g4 c6 ³ (-0.70) Depth: 13 00:01:31 52825kN (Blass, Tel-aviv 15.11.2001) After Qc1 Chess Tiger 14.6 - TSCP 1.73 2kn3r/ppp4p/4p1pB/1P2pr2/2B5/q1bP4/2R2PPP/2Q2RK1 b - - 0 1 Analysis by Yace 0.99.56: 21...Qxc1 22.Bxc1 -+ (-1.50) Depth: 1 00:00:00 21...Qxc1 22.Bxc1 -+ (-1.50) Depth: 2 00:00:00 21...Qxc1 22.Bxc1 Bb4 23.Ba2 -+ (-1.50) Depth: 3 00:00:00 21...Qxc1 22.Bxc1 Bb4 23.Ba2 Rh5 -+ (-1.50) Depth: 4 00:00:00 21...Qxc1 22.Bxc1 Bb4 23.Ba2 Rh5 24.Bd2 -+ (-1.50) Depth: 5 00:00:00 6kN 21...Qxc1 22.Bxc1 Bb4 23.Ba2 Rh5 24.Bd2 Bxd2 -+ (-1.50) Depth: 6 00:00:00 17kN 21...Qxc1 22.Bxc1 Bb4 23.Ba2 Rh5 24.Bd2 Bxd2 25.Rxd2 -+ (-1.50) Depth: 7 00:00:00 81kN 21...Qxc1 22.Bxc1 Bb4 23.Ba2 Rh5 24.Bd2 Bxd2 25.Rxd2 Kd7 -+ (-1.50) Depth: 8 00:00:00 245kN 21...Qxc1 22.Bxc1 Bb4 23.Ba2 Rh5 24.Bd2 Bxd2 25.Rxd2 Kd7 26.Kh1 a5 -+ (-1.50) Depth: 9 00:00:01 675kN 21...Qxc1 22.Bxc1 Bb4 23.Ba2 Rh5 24.Bd2 Bxd2 25.Rxd2 Kd7 26.Kh1 a5 27.bxa6 bxa6 -+ (-1.50) Depth: 10 00:00:04 2486kN 21...Qxc1 22.Bxc1 Bd4 23.Ba2 Rf7 24.Bg5 Kd7 25.Bc4 Rg8 26.g4 Kd6 27.Re1 -+ (-1.50) Depth: 11 00:00:10 6258kN 21...Qxc1 22.Bxc1 Bd4 23.Ba2 Rf7 24.Bg5 Kd7 25.Bc4 Rg8 26.g4 Kd6 27.Re1 a5 -+ (-1.50) Depth: 12 00:00:18 10599kN 21...Qxc1 22.Bxc1 Bd4 23.Ba2 Rf7 24.Bg5 Kd7 25.Bc4 Rg8 26.g4 Kd6 27.Re1 b6 28.Ba2 -+ (-1.50) Depth: 13 00:00:43 26497kN (Blass, Tel-aviv 15.11.2001) Uri
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