Author: John Merlino
Date: 11:17:04 02/22/02
Go up one level in this thread
On February 22, 2002 at 13:05:40, Uri Blass wrote: >On February 22, 2002 at 12:35:25, Albert Silver wrote: > >>On February 22, 2002 at 12:26:19, Jorge Pichard wrote: >> >>>In the 4th game between GM Van Wely Vs Rebel Century 4, if we set up the >>>position after the 42th move and allow different programs to continue the game >>>using the same time as was left in the actual game. How many programs can find >>>the correct continuation to draw this game? >>> >>>[D]3r3k/5p1p/1p1P1P2/p7/P2RNKP1/1P6/7r/8 b - - 0 1 >> >>This position looks completely lost already. What move do you think draws? >> >> Albert > >I do not know if there is a drawing move but it is clear that Rc2 was a mistake >and made things simple for white. > >How much time does Rebel need to avoid Rc2 and how much time do programs need to >find Rc4 after Rc2? > >Uri Chessmaster 8000 (default personality on a PIII-600) never considers Rc2: Time Depth Score Positions Moves 0:00 1/3 4.87 739 1...Rh3 2.Ng5 Rxd6 3.Nxf7+ Kg8 4.Nxd6 Rxb3 0:00 1/3 0.43 852 1...Rb2 2.Rd3 Kg8 3.d7 0:00 1/4 0.43 1484 1...Rb2 2.Rd3 Kg8 3.d7 0:00 2/5 0.45 3654 1...Rb2 2.Rd3 Kg8 3.d7 Kf8 0:00 3/6 0.40 12115 1...Rb2 2.Rd3 Kg8 3.d7 Kf8 4.Ke5 0:00 4/7 0.59 41594 1...Rb2 2.d7 h6 3.Rd3 Kg8 4.Ke5 Kf8 0:01 4/7 0.45 113798 1...Kg8 2.Rd5 Rh3 3.Rb5 Rb8 4.b4 axb4 5.Rxb4 0:03 5/8 0.46 229358 1...Kg8 2.b4 axb4 3.Rxb4 Ra2 4.Kf5 h6 5.Rxb6 Rxa4 0:07 6/9 0.44 557334 1...Kg8 2.b4 axb4 3.Rxb4 Ra2 4.Rd4 Rd7 5.Ke5 Re2 6.g5 0:20 7/10 0.51 1558535 1...Kg8 2.b4 axb4 3.Rxb4 Ra2 4.Rd4 Rd7 5.Ke5 Kf8 6.Nc3 Rf2 0:32 7/10 0.48 2508680 1...h6 2.b4 Rb2 3.bxa5 bxa5 4.d7 Kg8 5.Ke5 Rb4 6.Nc5 Rxd4 7.Kxd4 0:45 7/10 0.43 3607592 1...h5 2.gxh5 Rxh5 3.d7 Kh7 4.Rd6 Kg6 5.Rd3 b5 6.axb5 Rf5+ 7.Ke3 Rxb5 1:31 8/11 0.76 7592192 1...h5 2.d7 hxg4 3.Ng5 Rf2+ 4.Ke5 Kg8 5.Rxg4 Re2+ 6.Kd6 Rd2+ 7.Kc6 R8xd7 8.Ne4+ Kf8 9.Nxd2 Rxd2 10.Kxb6 2:15 8/11 0.43 11131623 1...Kg8 2.Rd5 Rc2 3.Rb5 Rc6 4.b4 axb4 5.Rxb4 Rcxd6 6.Nxd6 Rxd6 7.g5 Kf8 8.Ke5 4:23 9/12 0.42 21752793 1...Kg8 2.Rd5 Rc2 3.Rb5 Rc6 4.b4 axb4 5.Rxb4 Kf8 6.Rd4 Rc2 7.Rd3 Re8 8.d7 But, after Rc2, CM8000 never considers Rc4 either (although perhaps Nd2 is also interesting) Time Depth Score Positions Moves 0:00 1/3 -0.74 675 2.d7 Rc7 3.Rd6 Rcxd7 4.Rxb6 0:00 1/3 0.54 851 2.Kf5 Rb2 3.d7 Rxb3 0:00 1/3 0.61 1898 2.Ke5 Rb2 3.d7 Rxb3 0:00 1/4 0.61 2366 2.Ke5 Rb2 3.d7 Rxb3 0:00 2/5 0.36 6083 2.Ke5 Kg8 3.Rd3 Re8+ 4.Kf5 Kf8 5.d7 0:00 2/5 0.49 7900 2.Kf5 Kg8 3.b4 axb4 4.Rxb4 Ra2 5.Rxb6 Rxa4 0:00 2/5 0.77 17900 2.b4 Ra2 3.bxa5 bxa5 4.d7 Kg8 0:00 3/6 0.48 27294 2.b4 Kg8 3.Kf5 Kf8 4.bxa5 bxa5 5.Rd5 0:01 4/7 0.65 70342 2.b4 Rc1 3.bxa5 bxa5 4.Rd5 Rf1+ 5.Ke3 Re1+ 6.Kf3 Rf1+ 7.Nf2 h6 8.d7 Kg8 0:02 5/8 0.54 177190 2.b4 axb4 3.Rxb4 Ra2 4.Rxb6 Rxa4 5.Rb7 Kg8 6.Ke5 Re8+ 7.Re7 0:06 6/9 0.54 479442 2.b4 axb4 3.Rxb4 Kg8 4.Rxb6 Rc4 5.Rb5 Rxa4 6.Rd5 Rd7 0:20 7/10 0.43 1668683 2.b4 h6 3.bxa5 bxa5 4.Kf3 Rb2 5.d7 Rb7 6.Nc5 Rb6 7.Rf4 Kg8 1:00 8/11 0.40 5122880 2.b4 h6 3.bxa5 bxa5 4.Kf3 Rb2 5.d7 Kg8 6.Rd5 Rb4 7.Nc5 Kf8 3:23 9/12 0.30 17426353 2.b4 h6 3.bxa5 bxa5 4.g5 h5 5.Kf5 Kg8 6.Rd5 h4 7.Rxa5 h3 8.Rd5 7:07 9/12 0.36 36034209 2.Rd5 Rc1 3.g5 Rf1+ 4.Kg4 Rg1+ 5.Kf3 Kg8 6.Rb5 Rb8 7.Ke2 Rb7 8.b4 axb4 9.Rxb4 Rg2+ 10.Ke3 10:54 9/12 0.50 55377968 2.Nd2 Kg8 3.Nc4 Rc3 4.d7 Rxb3 5.Ke5 Kf8 6.Kd6 Ra8 7.Kc6 Rd8 8.Nxb6 But, after Rc2 Rc4 Rxc4 bxc4, you are absolutely correct -- things are much easier for White: Time Depth Score Positions Moves 0:00 2/3 0.31 348 3...Kg8 4.Kf5 Rd7 0:00 3/4 0.26 1144 3...Kg8 4.Ke5 Kf8 5.c5 Re8+ 6.Kd5 bxc5 7.Nxc5 0:00 4/5 0.37 2623 3...Kg8 4.Ke5 Kf8 5.Kd5 Re8 6.d7 0:00 5/6 0.47 6628 3...Kg8 4.Ke5 Kf8 5.Kd5 Ke8 6.c5 bxc5 7.Nxc5 0:00 6/7 0.53 19522 3...Kg8 4.Ke5 Kf8 5.g5 Ke8 6.c5 bxc5 7.Nxc5 0:00 7/8 0.46 44006 3...Kg8 4.Ke5 Kf8 5.c5 Re8+ 6.Kd4 bxc5+ 7.Nxc5 Rd8 8.Nb7 Rd7 0:01 8/9 0.51 98066 3...Kg8 4.Ke5 Kf8 5.c5 bxc5 6.Nxc5 Re8+ 7.Kd5 Re1 8.d7 Rd1+ 9.Kc6 h6 10.Kc7 0:02 9/10 0.55 215974 3...Kg8 4.Ke5 Kf8 5.c5 bxc5 6.Nxc5 Re8+ 7.Kd5 Re1 8.Nb3 Rf1 9.d7 Rd1+ 10.Nd4 0:04 10/11 0.63 489349 3...Kg8 4.Ke5 Kf8 5.c5 bxc5 6.Nxc5 Ke8 7.d7+ Rxd7 8.Nxd7 Kxd7 9.Ke4 Kd6 10.g5 Ke6 0:10 11/12 0.59 1041119 3...Kg8 4.Ke5 Kf8 5.c5 bxc5 6.Nxc5 Ke8 7.d7+ Rxd7 8.Nxd7 Kxd7 9.g5 Kc6 10.Ke4 Kd6 11.Kd4 0:24 12/13 2.23 2481719 3...Kg8 4.Ke5 Kf8 5.c5 bxc5 6.Nxc5 Ke8 7.d7+ Rxd7 8.Nxd7 Kxd7 9.Kd5 h6 10.Kc5 Ke6 11.Kb5 h5 12.gxh5 Kxf6 13.Kxa5 0:39 12/13 1.75 3958670 3...h6 4.Ke5 Kh7 5.c5 bxc5 6.Nxc5 Kg6 7.d7 Kg5 8.Kd6 h5 9.Ke7 Rb8 10.gxh5 1:20 13/14 2.15 8003906 3...h6 4.Ke5 Kh7 5.c5 bxc5 6.Nxc5 Kg6 7.d7 Kg5 8.Kd6 Kxg4 9.Nb7 Rb8 10.d8=Q Rxd8+ 11.Nxd8 2:55 14/15 2.54 17363303 3...h6 4.Ke5 Kh7 5.Kd5 h5 6.gxh5 Kh6 7.Kc6 Rc8+ 8.Kb5 Kxh5 9.d7 Rd8 10.Kc6 Ra8 11.Kxb6 Rb8+ 12.Kc7 jm
This page took 0 seconds to execute
Last modified: Thu, 15 Apr 21 08:11:13 -0700
Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.