Author: Ralf Schäfer
Date: 03:26:29 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 >D3 00:00 0.00 Qa8a2 Kc4b4 Qa2a3 Kb4c4 Qa3a2 >D4 00:00 0.00 Qa8a2 Kc4b4 Qa2a3 Kb4c4 Qa3a2 >D5 00:00 0.00 Qa8a2 Kc4b4 Qa2a3 Kb4c4 Qa3a2 >D6 00:00 0.00 Qa8a2 Kc4b4 Qa2a3 Kb4c4 Qa3a2 >D7 00:00 0.00 Qa8a2 Kc4b4 Qa2a3 Kb4c4 Qa3a2 >D8 00:00 0.00 Qa8a2 Kc4b4 Qa2a3 Kb4c4 Qa3a2 >D9 00:00 0.00 Qa8a2 Kc4b4 Qa2a3 Kb4c4 Qa3a2 >D10 00:00 0.00 Qa8a2 Kc4b4 Qa2a3 Kb4c4 Qa3a2 >D11 00:00 0.00 Qa8a2 Kc4b4 Qa2a3 Kb4c4 Qa3a2 >D12 00:01 0.00 Qa8a2 Kc4b4 Qa2a3 Kb4c4 Qa3a2 >D13 00:04 0.00 Qa8a2 Kc4b4 Qa2a3 Kb4c4 Qa3a2 >D14 00:08 0.00 Qa8a2 Kc4b4 Qa2a3 Kb4c4 Qa3a2 >D15 00:17 0.00 Qa8a2 Kc4b4 Qa2a3 Kb4c4 Qa3a2 >D16 00:33 0.00 Qa8a2 Kc4b4 Qa2a3 Kb4c4 Qa3a2 >D17 01:04 0.00 Qa8a2 Kc4b4 Qa2a3 Kb4c4 Qa3a2 >D18 02:02 0.00 Qa8a2 Kc4b4 Qa2a3 Kb4c4 Qa3a2 My Engine Cheetah seems not to have a problem with this position. It sees Qd5 at Play 2, giving it a winning score at ply 5. Cheetah 0.70 CCT6 Build 4 WB2 1 00:00 -9,70 Da8e8 1 00:00 -1,00 Da8d8 1 00:00 -0,60 Da8c8+ Kc4d4 2 00:00 -1,00 Da8c8+ Kc4b3 Dc8f5 2 00:00 -0,60 Da8g8+ Kc4b4 Dg8g4+ Kb4b3 2 00:00 0,40 Da8d5+ Kc4b4 Kd6c6 De1e2 3 00:00 0,20 Da8d5+ Kc4b4 Kd6c6 De1c1+ Kc6xb6 Dc1f1 4 00:01 -0,20 Da8d5+ Kc4b4 Kd6c6 De1c1+ Kc6xb6 Dc1f1 Dd5d7 5 00:01 6,69 Da8d5+ Kc4b4 Dd5d3 De1c1 Dd3a3+ Kb4c4 b2b3+ Kc4c3 Da3xc1+ Kc3xb3 6 00:01 7,57 Da8d5+ Kc4b4 Dd5d3 De1a1 Dd3c3+ Kb4a4 b2b3+ Ka4a3 Dc3xa1+ Ka3xb3 Kd6c6 b5b4 7 00:01 7,07 Da8d5+ Kc4b4 Dd5d3 De1a1 Dd3c3+ Kb4a4 b2b3+ Ka4a3 Dc3xa1+ Ka3xb3 Kd6c6 b5b4 Kc6xb6 8 00:01 7,69 Da8d5+ Kc4b4 Dd5d3 De1a1 Dd3c3+ Kb4a4 b2b3+ Ka4a3 Dc3xa1+ Ka3xb3 Kd6c6 Kb3b4 Da1a7 Kb4c4 9 00:01 7,69 Da8d5+ Kc4b4 Dd5d3 De1a1 Dd3c3+ Kb4a4 b2b3+ Ka4a3 Dc3xa1+ Ka3xb3 Da1b1+ Kb3c4 Db1f1+ Kc4b4 Kd6c6 Kb4a5 10 00:01 7,71 Da8d5+ Kc4b4 Dd5d3 De1a1 Dd3c3+ Kb4a4 b2b3+ Ka4a3 Dc3xa1+ Ka3xb3 Kd6c6 b5b4 Kc6b5 Kb3c2 Kb5xb4 Kc2d3 11 00:02 8,71 Da8d5+ Kc4b4 Dd5d3 De1a1 Dd3c3+ Kb4a4 b2b3+ Ka4a3 Dc3xa1+ Ka3xb3 Da1b1+ Kb3c4 Db1f1+ Kc4b4 Kd6c6 Kb4b3 Kc6xb5 Kb3c2 12 00:04 8,71 Da8d5+ Kc4b4 Dd5d3 De1a1 Dd3c3+ Kb4a4 b2b3+ Ka4a3 Dc3xa1+ Ka3xb3 Da1b1+ Kb3c4 Db1f1+ Kc4b4 Kd6c6 Kb4c3 Kc6xb5 Kc3c2 Df1e2+ Kc2c3 13 00:28 10,17 Da8d5+ Kc4b4 Dd5d3 De1c1 Dd3a3+ Kb4c4 b2b3+ Kc4d3 Da3xc1 b5b4 Kd6c6 b6b5 Kc6xb5 Kd3d4 Kb5xb4 Kd4e4 Dc1b1+ Ke4f4 14 00:37 10,33 Da8d5+ Kc4b4 Dd5d3 De1c1 Dd3a3+ Kb4c4 b2b3+ Kc4d3 Da3xc1 b5b4 Dc1c4+ Kd3e3 Dc4xb4 b6b5 Db4xb5 Ke3f2 b3b4 Kf2g3 Db5d3+ Kg3g4 15 00:49 10,33 Da8d5+ Kc4b4 Dd5d3 De1c1 Dd3a3+ Kb4c4 b2b3+ Kc4d3 Da3xc1 b5b4 Dc1c4+ Kd3e3 Dc4xb4 b6b5 Db4xb5 Ke3f2 b3b4 Kf2g3 Kd6c6 Kg3g4 16 02:33 10,49 Da8d5+ Kc4b4 Dd5d3 De1c1 Dd3a3+ Kb4c4 b2b3+ Kc4d3 Da3xc1 Kd3e2 b3b4 Ke2d3 Kd6c6 Kd3e2 Kc6xb5 Ke2d3 Kb5xb6 Kd3e2 b4b5 Ke2d3 17 06:29 M12 Da8d5+ Kc4b4 Dd5d3 De1c1 Dd3a3+ Kb4c4 b2b3+ Kc4d3 Da3xc1 Kd3d4 b3b4 Kd4e4 Kd6e6 Ke4d4 Dc1d2+ Kd4c4 Ke6e5 Kc4b3 Ke5d4 Kb3a4 17 06:29 M12 (HSize 16777215 HFull 2230264 HHits 60799807 HReps 3237880 HCols 367989 NSearch 45749692 NQuiesce 30180709 SelDepthSearch 30 SelDepthQuiesce 31) Best Ralf
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