Author: Gian-Carlo Pascutto
Date: 03:38:12 01/03/02
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On January 03, 2002 at 06:27:53, Uri Blass wrote: >With only single reply extension and no pruning the mate is only 8 plies > >1.0-0-0 2.Rd8 3.Rd7 4.Rd6 5.Rd5 6.Rd4 7.Rd3 8.Ra3# > > >How many plies is this line for your program? It did not see it in the first 22 ply, and took a very long time for ply 23 (didn't have patience to let it finish) mate in 8 = 16 ply 16 + 7 (zugzwang detection) = 23 So I guess it would have found the mate at ply 23. With better pruning rules I get : Clearing hash... Time for move : 3529063 2 1070 44 36 Rd1 Kxa7 2 1070 44 36 Rd1 Kxa7 2 1070 44 60 Rd1 Kxa7 3 1070 44 102 Rd1 Kxa7 Rd6 3 1070 44 102 Rd1 Kxa7 Rd6 3 1070 44 371 Rd1 Kxa7 Rd6 4 1115 44 592 Rd1 Kxa7 Rd6 Kb8 4 1115 44 592 Rd1 Kxa7 Rd6 Kb8 4 1115 44 1148 Rd1 Kxa7 Rd6 Kb8 5 1127 44 2105 Rd1 Kxa7 Rd6 Kb8 Rd7 5 1127 44 2105 Rd1 Kxa7 Rd6 Kb8 Rd7 5 1127 44 5435 Rd1 Kxa7 Rd6 Kb8 Rd7 6 1181 44 8487 Rd1 !! 6 1171 44 12482 Rd1 ?? 6 999500 49 21160 Rc1 !! 6 1169 49 21590 Rc1 ?? 7 2171 49 41753 Rc1 ?? 7 1541 49 67141 Rc1 ?? 7 999500 49 69890 Rc1 !! 7 999500 49 69890 Rc1 8 2236 55 113490 Rc1 ?? 8 999500 66 233503 O-O-O ! 8 2236 66 258130 Rc1 ?? 8 999500 66 270932 Rc1 !! 8 999500 66 270932 Rc1 9 2663 77 411882 Rc1 ?? 9 999500 82 416753 O-O-O ! 9 999500 104 709861 Rb1 ! 9 999500 132 1040336 Rd1 ! 9 999500 132 1052042 Kd2 ! 9 999500 137 1073281 Rc1 !! 9 2139 153 1308409 Rc1 Kxa7 Rc7+ Kb8 Rb7+ Ka8 Rd7 Kb8 Rd8+ Kc7 a7 Kxd8 a8=Q+ Ke7 Qe4+ Kf7 a6 Kf6 a7 <Kf7> 9 2139 153 1308409 Rc1 Kxa7 Rc7+ Kb8 Rb7+ Ka8 Rd7 Kb8 Rd8+ Kc7 a7 Kxd8 a8=Q+ Ke7 Qe4+ Kf7 a6 Kf6 a7 <Kf7> 9 999500 153 1308507 Rd1 ! 9 999976 153 1320623 Rd1 Kxa7 Rd7+ Kb8 Kd2 Ka8 Rd8+ Ka7 Rc8 Kxa6 Rc7 <Kxa5> <Rc6> <Kxa4> <Rc5> <Kxa3> 9 999976 153 1320630 Rd1 Kxa7 Rd7+ Kb8 Kd2 Ka8 Rd8+ Ka7 Rc8 Kxa6 Rc7 <Kxa5> <Rc6> <Kxa4> <Rc5> <Kxa3> 10 999978 241 2299411 Rd1 Kxa7 Rd7+ Kb8 Kd1 Ka8 Rd8+ Ka7 Kd2 Kxa6 Rd7 10 999978 241 2299411 Rd1 Kxa7 Rd7+ Kb8 Kd1 Ka8 Rd8+ Ka7 Kd2 Kxa6 Rd7 10 999984 340 3459057 O-O-O ! 10 999984 346 3509542 O-O-O Kxa7 Rd8 Kxa6 Rd7 Kxa5 Rd6 Kxa4 Rd5 Kxa3 10 999984 346 3509542 O-O-O Kxa7 Rd8 Kxa6 Rd7 Kxa5 Rd6 Kxa4 Rd5 Kxa3 The mate in 8 is found after finishing ply 10 -- GCP
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