Author: Harald Lüßen
Date: 02:30:29 02/01/04
Go up one level in this thread
On January 31, 2004 at 19:29:18, Jaime Benito de Valle Ruiz wrote: >I came across this position almost by accident. A few moves before this, my >"poor engine" was giving a huge score for white in no time, while Ruffian >sticked to draw. So I reanalized the whole thing. >Why can't Ruffian 1.05 find an easy 1.Qd5 and win? Null move? Special Pruning? > >[d]Q7/8/1p1K4/1p6/2k5/8/1P6/4q3 w - - > >Ruffian_105 UCI 60 MB: >D1 00:00 -2.11 b2b3 Kc4xb3 >D1 00:00 -0.98 Kd6c6 >D1 00:00 -0.24 Qa8c6 Kc4b4 Qc6xb6 >D2 00:00 -0.24 Qa8c6 Kc4b4 Qc6xb6 >D2 00:00 -0.16 Qa8d5 Kc4b4 Kd6c6 Qe1e3 Qd5xb5 >D2 00:00 0.00 Qa8a2 Kc4b4 Qa2a3 Kb4c4 Qa3a2 ... >D18 02:02 0.00 Qa8a2 Kc4b4 Qa2a3 Kb4c4 Qa3a2 My very poor (slow and maybe still buggy) engine does the same. (ply, score, sec/100, nodes, PV) 0 -72 0 2 Qa8-d5 0 -42 0 11 Qa8-a2 1 -42 0 13 Qa8-a2 2 -46 0 126 Qa8-a2 Kc4-d3 b2-b3 2 -40 0 175 Qa8-d5 Kc4-b4 Qd5-a2 2 -12 0 274 Qa8-c6 Kc4-d3 Qc6xb5 3 -65 0 953 Qa8-c6 Kc4-b4 Qc6xb6 Qe1-e8 Qb6-d4 3 -53 0 1088 Qa8-d5 Kc4-b4 Qd5-d4 Kb4-a5 b2-b3 3 -38 0 1695 Qa8-g8 Kc4-b4 Qg8-g4 Kb4-b3 Qg4-g2 3 -12 0 1902 Qa8-a2 Kc4-b4 Qa2-a3 Kb4-c4 Qa3-a1 4 -12 0 2370 Qa8-a2 Kc4-b4 Qa2-a3 Kb4-c4 Qa3-a2 Kc4-b4 Qa2-a3 Kb4-c4 Qa3-a2 Kc4-b4 Qa2-a3 5 0 4 5075 Qa8-a2 Kc4-b4 Qa2-a3 Kb4-c4 Qa3-a2 Kc4-b4 Qa2-a3 Kb4-c4 Qa3-a2 Kc4-b4 Qa2-a3 Kb4-c4 6 0 9 12691 Qa8-a2 Kc4-b4 Qa2-a3 Kb4-c4 Qa3-a2 Kc4-b4 Qa2-a3 Kb4-c4 Qa3-a2 Kc4-b4 Qa2-a3 Kb4-c4 Qa3-a2 7 0 14 25707 Qa8-a2 Kc4-b4 Qa2-a3 Kb4-c4 Qa3-a2 Kc4-b4 Qa2-a3 Kb4-c4 Qa3-a2 Kc4-b4 Qa2-a3 Kb4-c4 Qa3-a2 Kc4-b4 8 0 26 55147 Qa8-a2 Kc4-b4 Qa2-a3 Kb4-c4 Qa3-a2 Kc4-b4 Qa2-a3 Kb4-c4 Qa3-a2 Kc4-b4 Qa2-a3 Kb4-c4 Qa3-a2 Kc4-b4 Qa2-a3 9 0 57 137692 Qa8-a2 Kc4-b4 Qa2-a3 Kb4-c4 Qa3-a2 Kc4-b4 Qa2-a3 Kb4-c4 Qa3-a2 Kc4-b4 Qa2-a3 Kb4-c4 Qa3-a2 Kc4-b4 Qa2-a3 Kb4-c4 10 0 128 318917 Qa8-a2 Kc4-b4 Qa2-a3 Kb4-c4 Qa3-a2 Kc4-b4 Qa2-a3 Kb4-c4 Qa3-a2 Kc4-b4 Qa2-a3 Kb4-c4 Qa3-a2 Kc4-b4 Qa2-a3 Kb4-c4 Qa3-a2 11 0 259 652067 Qa8-a2 Kc4-b4 Qa2-a3 Kb4-c4 Qa3-a2 Kc4-b4 Qa2-a3 Kb4-c4 Qa3-a2 Kc4-b4 Qa2-a3 Kb4-c4 Qa3-a2 Kc4-b4 Qa2-a3 Kb4-c4 Qa3-a2 Kc4-b4 12 0 1143 2776770 Qa8-a2 Kc4-b4 Qa2-a3 Kb4-c4 Qa3-a2 Kc4-b4 Qa2-a3 Kb4-c4 Qa3-a2 Kc4-b4 Qa2-a3 Kb4-c4 Qa3-a2 Kc4-b4 Qa2-a3 Kb4-c4 Qa3-a2 Kc4-b4 Qa2-a3 13 0 1892 4544282 Qa8-a2 Kc4-b4 Qa2-a3 Kb4-c4 Qa3-a2 Kc4-b4 Qa2-a3 Kb4-c4 Qa3-a2 Kc4-b4 Qa2-a3 Kb4-c4 Qa3-a2 Kc4-b4 Qa2-a3 Kb4-c4 Qa3-a2 Kc4-b4 Qa2-a3 Kb4-c4 14 0 3437 8227562 Qa8-a2 Kc4-b4 Qa2-a3 Kb4-c4 Qa3-a2 Kc4-b4 Qa2-a3 Kb4-c4 Qa3-a2 Kc4-b4 Qa2-a3 Kb4-c4 Qa3-a2 Kc4-b4 Qa2-a3 Kb4-c4 Qa3-a2 Kc4-b4 Qa2-a3 Kb4-c4 Qa3-a2 15 0 9892 22722218 Qa8-a2 Kc4-b4 Qa2-a3 Kb4-c4 Qa3-a2 Kc4-b4 Qa2-a3 Kb4-c4 Qa3-a2 Kc4-b4 Qa2-a3 Kb4-c4 Qa3-a2 Kc4-b4 Qa2-a3 Kb4-c4 Qa3-a2 Kc4-b4 Qa2-a3 Kb4-c4 Qa3-a2 Kc4-b4 16 0 19467 44458358 Qa8-a2 Kc4-b4 Qa2-a3 Kb4-c4 Qa3-a2 Kc4-b4 Qa2-a3 Kb4-c4 Qa3-a2 Kc4-b4 Qa2-a3 Kb4-c4 Qa3-a2 Kc4-b4 Qa2-a3 Kb4-c4 Qa3-a2 Kc4-b4 Qa2-a3 Kb4-c4 Qa3-a2 Kc4-b4 Qa2-a3 When I play Qd5 it sees a mate after 1 hour. And I don't trust the score. I use adaptive null move pruning. (ply, score, sec/100, nodes, PV) 1 84 0 9 Kc4-b4 Qd5-d4 2 35 0 47 Kc4-b4 Qd5-g2 3 52 0 202 Kc4-b4 Qd5-a2 Qe1-e3 4 56 0 746 Kc4-b4 Qd5-a2 Qe1-g3 Kd6-c6 Qg3-e3 5 -87 3 4819 Kc4-b4 Qd5-a2 Qe1-g3 Kd6-c6 Qg3-e3 5 0 3 4918 Kc4-b4 Qd5-d3 Qe1-e4 Qd3xe4 Kb4-b3 6 -87 3 5939 Kc4-b4 Qd5-d3 Qe1-e4 Qd3xe4 Kb4-b3 6 -6 4 9298 Kc4-b4 Kd6-c6 Qe1-e8 Kc6xb6 Qe8-b8 Kb6-c6 Qb8-e8 7 -93 6 13341 Kc4-b4 Kd6-c6 Qe1-e8 Kc6xb6 Qe8-b8 Kb6-c6 Qb8-e8 7 -8 9 18472 Kc4-b4 Kd6-c6 Qe1-e8 Kc6xb6 Qe8-b8 Kb6-c6 Qb8-c8 Kc6-d6 8 -93 12 28358 Kc4-b4 Kd6-c6 Qe1-e8 Kc6xb6 Qe8-b8 Kb6-c6 Qb8-c8 Kc6-d6 8 -19 17 39002 Kc4-b4 Qd5-d4 Kb4-a5 Qd4-d3 Qe1-b4 Kd6-e5 Qb4xb2 Ke5-d5 b5-b4 9 -7 42 99231 Kc4-b4 Qd5-d4 Kb4-a5 Kd6-d5 Qe1-h1 9 -93 129 268107 Kc4-b4 Qd5-d4 Kb4-a5 Kd6-d5 Qe1-h1 10 -65 200 450589 Kc4-b4 Qd5-d4 Kb4-a5 Kd6-c6 Qe1-h1 Kc6-c7 Qh1-h7 Kc7-d6 Qh7-h6 Kd6-d7 Qh6-h7 Kd7-d6 Qh7-h6 Kd6-d7 Qh6-h7 Kd7-d6 10 -93 410 874102 Kc4-b4 Qd5-d4 Kb4-a5 Kd6-c6 Qe1-h1 Kc6-c7 Qh1-h7 Kc7-d6 Qh7-h6 Kd6-d7 Qh6-h7 Kd7-d6 Qh7-h6 Kd6-d7 Qh6-h7 Kd7-d6 11 -77 925 2492214 Kc4-b4 Kd6-c6 Qe1-c1 Kc6xb6 Qc1-e3 Kb6-a6 Qe3-h6 Ka6-a7 Qh6-h8 Qd5-e4 Kb4-b3 Qe4-e3 Kb3-c4 b2-b3 Kc4-b4 Qe3-c1 11 -93 1239 3208832 Kc4-b4 Kd6-c6 Qe1-c1 Kc6xb6 Qc1-e3 Kb6-a6 Qe3-h6 Ka6-a7 Qh6-h8 Qd5-e4 Kb4-b3 Qe4-e3 Kb3-c4 b2-b3 Kc4-b4 Qe3-c1 12 -83 3329 9497139 Kc4-b4 Qd5-h5 12 -93 4235 11966063 Kc4-b4 Qd5-h5 13 -83 6901 19611793 Kc4-b4 Qd5-h5 Kb4-a5 Qh5-h2 Qe1-b4 Kd6-d7 Qb4-g4 Kd7-d6 Qg4-g6 Kd6-e5 Qg6-e8 Ke5-d4 Qe8-d7 Kd4-e4 Qd7-e6 Ke4-d4 Qe6-d7 Kd4-e4 Qd7-e6 13 -93 8785 23762024 Kc4-b4 Qd5-h5 Kb4-a5 Qh5-h2 Qe1-b4 Kd6-d7 Qb4-g4 Kd7-d6 Qg4-g6 Kd6-e5 Qg6-e8 Ke5-d4 Qe8-d7 Kd4-e4 Qd7-e6 Ke4-d4 Qe6-d7 Kd4-e4 Qd7-e6 14 -83 11473 31318839 Kc4-b4 Qd5-h5 Qe1-d2 Kd6-c6 Qd2-c2 Kc6xb6 Qc2-f2 Kb6-c6 Qf2-f6 Kc6-d5 Qf6xb2 Qh5-h4 Kb4-a5 Qh4-d8 Ka5-a4 Qd8-a8 Ka4-b4 14 -93 18701 51404514 Kc4-b4 Qd5-h5 Qe1-d2 Kd6-c6 Qd2-c2 Kc6xb6 Qc2-f2 Kb6-c6 Qf2-f6 Kc6-d5 Qf6xb2 Qh5-h4 Kb4-a5 Qh4-d8 Ka5-a4 Qd8-a8 Ka4-b4 15 -83 37829 115449584 Kc4-b4 Qd5-h5 Qe1-d2 Kd6-c6 Qd2-c2 Kc6xb6 Qc2-f2 Kb6-c6 Qf2-f6 Kc6-d5 Qf6xb2 Qh5-h4 Kb4-a5 Qh4-d8 Ka5-a4 Qd8-a8 Ka4-b4 15 -93 43739 131427831 Kc4-b4 Qd5-h5 Qe1-d2 Kd6-c6 Qd2-c2 Kc6xb6 Qc2-f2 Kb6-c6 Qf2-f6 Kc6-d5 Qf6xb2 Qh5-h4 Kb4-a5 Qh4-d8 Ka5-a4 Qd8-a8 Ka4-b4 16 -83 64254 198172462 Kc4-b4 Qd5-h5 Qe1-d2 Kd6-c6 Qd2-c2 Kc6xb6 Qc2-f2 Kb6-c6 Qf2-f6 Kc6-d5 Qf6xb2 Qh5-h4 Kb4-a5 Qh4-d8 Ka5-a4 Qd8-a8 Ka4-b3 Kd5-c5 Qb2-e5 Qa8-d5 Qe5xd5 Kc5xd5 16 -101 82395 240411979 Kc4-b4 Qd5-h5 Qe1-d2 Kd6-c6 Qd2-c2 Kc6xb6 Qc2-f2 Kb6-c6 Qf2-f6 Kc6-d5 Qf6xb2 Qh5-h4 Kb4-a5 Qh4-d8 Ka5-a4 Qd8-a8 Ka4-b3 Kd5-c5 Qb2-e5 Qa8-d5 Qe5xd5 Kc5xd5 17 -91 123798 380511472 Kc4-b4 Qd5-h5 Qe1-d2 Kd6-c6 Qd2-c2 Kc6xb6 Qc2-f2 Kb6-c6 Qf2-f6 Kc6-d5 Qf6xb2 Qh5-h4 Kb4-b3 Qh4-e1 Kb3-a4 Qe1-d1 Ka4-a5 Kd5-e6 17 0 148957 435710910 Kc4-b4 Qd5-d3 Qe1-d2 Qd3xd2 Kb4-b3 Qd2-c3 Kb3-a2 b2-b4 Ka2-b1 Kd6-d5 Kb1-a2 Kd5-d6 Ka2-b1 Kd6-d5 Kb1-a2 Kd5-d6 Ka2-b1 Kd6-d5 Kb1-a2 Kd5-d6 Ka2-b1 Kd6-d5 Kb1-a2 18 -94 166681 490555663 Kc4-b4 Qd5-d3 Qe1-d2 Qd3xd2 Kb4-b3 Qd2-c3 Kb3-a2 b2-b4 Ka2-b1 Kd6-d5 Kb1-a2 Kd5-d6 Ka2-b1 Kd6-d5 Kb1-a2 Kd5-d6 Ka2-b1 Kd6-d5 Kb1-a2 Kd5-d6 Ka2-b1 Kd6-d5 Kb1-a2 18 -94 266081 767329483 Kc4-b4 Qd5-d3 19 -84 355693 1067485769 Kc4-b4 Qd5-d3 Qe1-a1 Qd3-c3 19 -15944 361554 1083095304 Kc4-b4 Qd5-d3 Qe1-a1 Qd3-c3 Retrieving all PV moves from the hash table has obviously failed. Harald
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