Author: John Merlino
Date: 08:43:11 09/03/02
Go up one level in this thread
On September 03, 2002 at 09:29:24, Uri Blass wrote: >I am going to put the following positions in my test suite(they seem to be easy >for the top programs but not easy without the relevant knowledge) > >Can you find all the solutions? >I give a list of candidate moves and I am almost sure that the solutions are >only from the candidate moves. > >[D]8/8/3R2p1/1qb4p/8/p5P1/1pk2P1P/4Q1K1 w - - 0 76 > >candidate moves:Rd8,Qe4,Qd1+ > >Movei played Rd2+ that is a losing move. > >possible line 76.Rd8 g5 77.Qd1+ Kc3 78.Qf3+ Kb4 79.Qe4+ Kb3 80.Qe6+ Ka4 81.Qe4+ >Qb4 82.Qc2+ Ka5 83.Ra8+ Kb5 84.Qd3+ Qc4 85.Rb8+ Bb6 86.Rxb6+ Kxb6 87.Qxc4 b1Q+ >88.Kg2 and it seems that white can draw by perpetual check. Chessmaster, on a PIII-733, chooses Qe4+ in less than one second, but switches to Rd8 after 3:24, but it does not show anything close to a drawing score: Time Depth Score Positions Moves 0:00 1/3 -2.19 6248 76.Qd1+ Kc3 77.Qe1+ Kb3 78.Qe6+ Qc4 79.Rd3+ Kb4 80.Qe1+ Ka4 0:00 1/3 -2.09 9524 76.Qe4+ Kb3 77.Rd2 Qc4 78.Qxg6 0:00 1/3 -1.97 10258 76.Rd2+ Kb3 77.Qb1 Qc4 0:00 1/4 -2.19 20192 76.Rd2+ Kc3 77.Rd7+ Kb3 78.Qe6+ Qc4 79.Rd3+ Kb4 80.Qe1+ Ka4 0:00 1/4 -1.83 25984 76.Qe4+ Kb3 77.Qe6+ Qc4 78.Rd3+ Kb4 79.Qe1+ Kb5 80.Qe8+ Ka5 81.Qa8+ Qa6 0:00 1/5 -1.83 49824 76.Qe4+ Kb3 77.Qe6+ Qc4 78.Rd3+ Kb4 79.Qe1+ Kb5 80.Qe8+ Ka5 81.Qa8+ Qa6 0:01 1/6 -1.42 115391 76.Qe4+ Kb3 77.Qe6+ Kb4 78.Qe1+ Ka4 79.Qe4+ Qb4 80.Qe8+ Kb3 81.Qe6+ Kc2 82.Qxg6+ Kb3 0:02 1/7 -1.39 198838 76.Qe4+ Kb3 77.Qe6+ Kb4 78.Qe1+ Ka4 79.Qe4+ Qb4 80.Qe8+ Kb3 81.Qe6+ Kc2 82.Qxg6+ Kb3 83.Qe6+ Qc4 84.Rd3+ Kb4 0:05 1/8 -1.59 481834 76.Qe4+ Kb3 77.Qe6+ Ka4 78.Qe4+ Qb4 79.Qe8+ Kb3 80.Qe6+ Kc2 81.Qxg6+ Kc1 82.Qg5+ Kb1 83.Rd1+ Ka2 84.Qd5+ Qb3 0:15 2/9 -1.80 1522190 76.Qe4+ Kb3 77.Qe6+ Ka4 78.Qe4+ Qb4 79.Qe8+ Kb3 80.Qe6+ Kc2 81.Qe2+ Kb1 82.Rd1+ Ka2 83.Qc2 g5 84.Qb1+ Kb3 85.Rd5 Qb6 0:48 3/10 -1.79 4721469 76.Qe4+ Kb3 77.Qe6+ Ka4 78.Qe4+ Qb4 79.Qe8+ Kb3 80.Qe6+ Kc2 81.Qe2+ Kb1 82.Rd1+ Ka2 83.Qc2 h4 84.Qb1+ Kb3 85.Rd3+ Ka4 86.Qd1+ Ka5 87.Rb3 Qe4 1:40 4/11 -2.05 10200620 76.Qe4+ Kb3 77.Qe6+ Ka4 78.Qe4+ Qb4 79.Qe8+ Kb3 80.Qe6+ Kc2 81.Qe2+ Kb1 82.Rd1+ Ka2 83.Qc2 Bd4 84.Qb1+ Kb3 85.Rd3+ Bc3 86.Rd8 h4 87.Ra8 hxg3 88.hxg3 3:24 4/11 -1.90 19651309 76.Rd8 Kb3 77.Qe6+ Ka4 78.Qe4+ Qb4 79.Qc2+ Kb5 80.Qd3+ Qc4 81.Rb8+ Bb6 82.Qd7+ Qc6 83.Qd3+ Kb4 84.h4 Qb5 85.Qe4+ Kb3 86.Qe6+ Kc3 7:19 5/12 -1.90 41380792 76.Rd8 Kb3 77.Qe6+ Ka4 78.Qe4+ Qb4 79.Qc2+ Kb5 80.Qd3+ Qc4 81.Qd7+ Ka5 82.Qb7 Qb5 83.Qa8+ Qa6 84.Qe4 Bxf2+ 85.Kg2 Bc5 86.Rb8 Bb6 >[D]8/P3R3/8/3p4/3kpK2/8/8/r7 w - - 0 62 bm Rb7,? > >Movei played Kg4 that lost. > >candidate moves:Rb7,Rc7,Rd7,Rf7,Rg7,Rh7 > I remember this position from an earlier post. CM chooses Rb7, but the score is only vaguely drawish: Time Depth Score Positions Moves 0:00 1/3 -0.80 1084 62.Rd7 e3 63.Kf3 0:00 1/4 -0.64 3457 62.Rd7 Rf1+ 63.Kg3 Rg1+ 64.Kf2 Ra1 65.Re7 0:00 1/5 -0.74 9303 62.Rd7 Rf1+ 63.Kg3 Rg1+ 64.Kf2 Ra1 65.Ke2 Ra2+ 66.Kd1 0:00 2/6 -0.70 31879 62.Rd7 Ra2 63.Rg7 Kd3 64.Rg3+ Kc4 65.Rg7 Ra1 0:00 2/6 -0.65 47070 62.Rb7 Kd3 63.Rb3+ Kc2 64.Rb7 Ra3 65.Rd7 0:01 3/7 -0.67 77332 62.Rb7 Ra3 63.Re7 Kc5 64.Rb7 Kc6 65.Re7 0:01 4/8 -0.68 136614 62.Rb7 Kc5 63.Re7 Kb6 64.Rd7 Rxa7 65.Rxd5 Re7 66.Ke3 0:04 5/9 -0.77 328179 62.Rb7 Kc5 63.Re7 Ra3 64.Ke5 Ra5 65.Rd7 Kb6 66.Kd4 Rxa7 67.Rxd5 0:07 6/10 -0.72 621847 62.Rb7 Kc5 63.Re7 Ra3 64.Ke5 e3 65.Kf4 d4 66.Kf3 Ra1 0:13 7/11 -0.69 1239078 62.Rb7 Kc5 63.Re7 Ra3 64.Rh7 Kb6 65.Rd7 Kc6 66.Rh7 Kd6 67.Rg7 0:36 8/12 -0.63 3751010 62.Rb7 Kc5 63.Re7 Ra3 64.Rh7 Kb6 65.Rd7 Rxa7 66.Rxd5 Re7 67.Ke3 Re6 68.Rd1 1:11 9/13 -0.67 7592056 62.Rb7 Kc5 63.Re7 Ra3 64.Rh7 Kb6 65.Rd7 Rxa7 66.Rxd5 Re7 67.Ke3 Re6 68.Rd1 Kc5 2:25 10/14 -0.67 16055322 62.Rb7 Kc5 63.Rc7+ Kb6 64.Rd7 Kc6 65.Re7 Kd6 66.Rf7 Ra2 67.Ke3 Kc6 68.Rh7 Kb6 69.Rd7 Ra3+ 70.Ke2 Rxa7 71.Rxd5 8:03 11/15 -0.81 54539351 62.Rb7 Ra3 63.Rb4+ Kc5 64.Rb7 e3 65.a8=Q Rxa8 66.Kxe3 d4+ 67.Ke4 Re8+ 68.Kd3 Re3+ 69.Kd2 Rh3 70.Rd7 Kc4 71.Rc7+ Kd5 72.Rd7+ Ke4 jm
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