Author: Uri Blass
Date: 07:49:41 12/17/02
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On December 17, 2002 at 09:43:40, Michael Neish wrote: > >>Here is part of the analysis >> >>seeing negative score for Qxa4 is easy >>avoiding it is less easy but movei needs only 10 plies >> >>9 -151 1269 2148341 e8a4 f3g5 b8f8 d5e7 g8h8 d2f4 a4c2 e1e2 c2c5 f2f1 f7f6 e7g6 >>h8g8 g6f8 f6g5 >>10 -213 2332 3879872 e8a4 f3g5 b8f8 d5e7 g8h8 d2f4 a4c2 e1e2 c2c5 f2f1 d6d5 g5f7 >> f8f7 f4f7 c5c1 e2e1 c1c4 f1g1 c4d4 f7f2 >>10 -212 3584 6142397 e8f8 >>10 -199 4457 7666033 e8f8 d5b4 b7c5 f2g1 b8e8 a4a5 e8e4 e1e4 c5e4 d2d5 >>10 -199 4655 8000622 e8f8 d5b4 b7c5 f2g1 b8e8 a4a5 e8e4 e1e4 c5e4 d2d5 > >Thanks Uri. > >I fear I haven't made myself clear. My program first gets a negative score for >Qe8-a4 at ten ply as well, but a large fail low occurs at ply 13 when it sees >that there are all sorts of checkmates looming and loss of material is >inevitable. If you let your program analyse the position normally it will >change from Qa4 to Qf8 after a while, but my question is if you force Qa4 so >that the program cannot change its mind, at what depth will the fail low come? >Alternatively you could play Qa4 first then start the search, and add one ply to >the result. Not exactly My complicated search rules mean that I cannot add 1 to the result but here is the analysis of my program after Qxa4(I gave it more than an hour to search) It can see a positive score for white at all depthes. It can see a big fail high at depth 9 and another fail high at depth 11. Here is part of the analysis at small depthes and the full analysis at depth that is bigger than 8(the score at depth 13 is +5.26 pawns for white after slightly more than an hour). 2 105 1 1430 d2b4 a4d7 3 116 2 2932 d2b4 a4c2 f2g1 c7c5 4 122 4 7170 d2b4 a4b4 d5b4 b7c5 5 108 7 12485 d2b4 a4b4 d5b4 b7c5 f3d4 6 95 22 39390 d2b4 a4b4 d5b4 b7c5 f3d4 d6d5 7 117 422 739631 f3g5 a4a2 d2c2 g7g6 d5e7 g8h8 e7c6 b8f8 c6b4 8 125 630 1108209 f3g5 b8f8 d2d3 f7f5 d3c4 g8h8 d5c7 b7a5 9 213 1716 2963378 f3g5 b8f8 d5e7 g8h8 d2f4 a4c2 e1e2 c2c5 f2f1 d6d5 g5f7 f8f7 f 4f7 c5c1 e2e1 c1c4 f1g1 c4d4 f7f2 9 213 1834 3204726 f3g5 b8f8 d5e7 g8h8 d2f4 a4c2 e1e2 c2c5 f2f1 d6d5 g5f7 f8f7 f 4f7 c5c1 e2e1 c1c4 f1g1 c4d4 f7f2 10 213 2988 5298307 f3g5 b8f8 d5e7 g8h8 d2f4 a4c2 e1e2 c2c5 f2f1 d6d5 g5f7 f8f7 f4f7 c5c1 e2e1 c1c4 f1g1 c4d4 f7f2 10 213 3223 5766915 f3g5 b8f8 d5e7 g8h8 d2f4 a4c2 e1e2 c2c5 f2f1 d6d5 g5f7 f8f7 f4f7 c5c1 e2e1 c1c4 f1g1 c4d4 f7f2 11 243 5727 10087462 f3g5 11 243 6615 11814563 f3g5 12 343 169816 305749719 f3g5 h7h6 d5e7 g8f8 d2d3 b7c5 d3h7 f8e8 e7c6 e8d7 c6b8 d 7c8 g5f7 c8b8 f2g1 a4d7 h7g7 12 343 176135 317846980 f3g5 h7h6 d5e7 g8f8 d2d3 b7c5 d3h7 f8e8 e7c6 e8d7 c6b8 d 7c8 g5f7 c8b8 f2g1 a4d7 h7g7 13 347 222115 403127653 f3g5 h7h6 d5e7 g8f8 d2d3 b7c5 d3h7 f8e8 e7c6 e8d7 c6b8 d 7c8 g5f7 c8b8 f2g1 a4d7 h7g8 d7c8 g8g7 13 348 249611 453622532 d5e7 13 377 260984 473365386 d5e7 13 526 378297 680682027 d5e7 g8h8 f3g5 a4a2 d2b4 a6a5 b4b7 b8f8 b7c7 a2b2 f2g1 b 2f6 c7a5 f6d4 g1h2 h7h6 g5e4 13 526 380084 684350755 d5e7 g8h8 f3g5 a4a2 d2b4 a6a5 b4b7 b8f8 b7c7 a2b2 f2g1 b 2f6 c7a5 f6d4 g1h2 h7h6 g5e4 Uri
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