Author: Christopher Conkie
Date: 02:45:17 06/14/05
Hi, The following position is a mate in two passed to us by a friend recently. It was only passed to us for the sake of interest, but is useful for our purposes. It is not part of our suite, but even here, in something so simple the strongest programs have big problems. You might say "well it does find a mate". I put it to you that it is mate in two, not 3 or 5 or any other strange number. Depth is a relative measurement. Let's start with something "deep". [D]4k3/3R1R2/8/8/2K1Nr2/4Q3/8/8 w - - 0 1 Analysis by Deep Junior 8: 1. +- (#3): 1.Rfe7+ Kf8 2.Qxf4+ Kg8 3.Rd8# 2. +- (#3): 1.Rde7+ Kd8 3. +- (13.83): 1.Rd8+ 4. +- (13.73): 1.Rg7 Rh4 5. +- (13.45): 1.Rxf4 Kxd7 6. +- (13.43): 1.Rh7 Rh4 No, it is not mate in three. ---------------------------------------------- Analysis by Comet B68: 1. +- (#2): 1.Rfe7+ Kf8 2.Qxf4+ Kg8 3.Re8# 2. +- (30.06): 1.Rde7+ Kd8 2.Qxf4 Kc8 3. +- (24.34): 1.Rxf4 Kxd7 4. +- (24.20): 1.Rd8+ Kxd8 2.Rxf4 5. +- (21.83): 1.Rg7 Rxe4+ 2.Qxe4+ Kf8 6. +- (21.82): 1.Rh7 Rxe4+ 2.Qxe4+ Kf8 Yes it is mate, but in two and not by these moves. You are showing a mate in three anyway....... ---------------------------------------------- Analysis by EXchess 4.03: 1. +- (#2): 1.Rfe7+ Kf8 2.Qxf4+ Kg8 3.Re8# You have company....... ---------------------------------------------- Zappa 1.0: 1 00:00 144 3.200 +M3 Rfe7+ Kf8 Qxf4+ Kg8 Qb8+ 2 00:00 1.936 33.379 +M3 Rfe7+ Kf8 Qxf4+ Kg8 Qb8+ 3 00:00 7.411 74.110 +M3 Rfe7+ Kf8 Qxf4+ Kg8 Qb8+ 4 00:00 31.907 125.125 +M3 Rfe7+ Kf8 Qxf4+ Kg8 Qb8+ 5 00:00 117.039 228.146 +M3 Rfe7+ Kf8 Qxf4+ Kg8 Qb8+ 6 00:00 195.905 293.270 +M3 Rfe7+ Kf8 Qxf4+ Kg8 Qb8+ 6 00:01 451.241 373.853 +M3 Rfe7+ Kf8 Qxf4+ Kg8 Qb8+ 7 00:02 834.471 409.455 +M3 Rfe7+ Kf8 Qxf4+ Kg8 Qb8+ 7 00:04 1.734.332 448.263 +M3 Rfe7+ Kf8 Qxf4+ Kg8 Qb8+ 8 00:07 3.492.725 471.989 +M3 Rfe7+ Kf8 Qxf4+ Kg8 Qb8+ 8 00:14 6.912.952 485.801 +M3 Rfe7+ Kf8 Qxf4+ Kg8 Qb8+ 9 00:28 13.574.236 484.603 +M3 Rfe7+ Kf8 Qxf4+ Kg8 Qb8+ 9 00:53 26.556.954 495.363 +M3 Rfe7+ Kf8 Qxf4+ Kg8 Qb8+ 10 01:51 55.289.807 497.156 +M3 Rfe7+ Kf8 Qxf4+ Kg8 Qb8+ 10 03:29 105.231.373 502.434 +M3 Rfe7+ Kf8 Qxf4+ Kg8 Qb8+ Now I'm getting worried. Best idea is to try something different. :-) But what? Ah yes.......I know....... ============================================ ApilChess 1.04: Userkommando: position fen 4k3/3R1R2/8/8/2K1Nr2/4Q3/8/8 w - - 0 1 3 00:00 48 0 +71.65 Qf3 Rxf3 Rxf3 4 00:00 93 0 +71.65 Qf3 Rxf3 Nd6+ 5 00:00 393 0 +71.65 Qf3 Rxf3 Nd6+ 6 00:00 811 0 +71.65 Qf3 Rxf3 Nd6+ 7 00:00 1.229 0 +71.65 Qf3 Rxf3 Nd6+ 8 00:01 1.647 0 +71.65 Qf3 Rxf3 Nd6+ 9 00:01 4.087 0 +71.65 Qf3 Rxf3 Nd6+ 10 00:01 6.538 0 +71.65 Qf3 Rxf3 Nd6+ 11 00:01 9.179 0 +71.65 Qf3 Rxf3 Nd6+ 12 00:01 11.807 0 +71.65 Qf3 Rxf3 Nd6+ 13 00:01 14.435 0 +71.65 Qf3 Rxf3 Nd6+ 14 00:01 17.063 0 +71.65 Qf3 Rxf3 Nd6+ 15 00:01 19.691 0 +71.65 Qf3 Rxf3 Nd6+ 16 00:01 22.319 0 +71.65 Qf3 Rxf3 Nd6+ 17 00:01 24.947 0 +71.65 Qf3 Rxf3 Nd6+ 18 00:01 27.575 0 +71.65 Qf3 Rxf3 Nd6+ 19 00:01 30.203 0 +71.65 Qf3 Rxf3 Nd6+ 20 00:01 32.831 0 +71.65 Qf3 Rxf3 Nd6+ 21 00:01 35.459 0 +71.65 Qf3 Rxf3 Nd6+ 22 00:01 38.087 0 +71.65 Qf3 Rxf3 Nd6+ 23 00:01 40.715 0 +71.65 Qf3 Rxf3 Nd6+ 24 00:01 43.343 0 +71.65 Qf3 Rxf3 Nd6+ 25 00:01 45.971 0 +71.65 Qf3 Rxf3 Nd6+ 26 00:01 48.599 0 +71.65 Qf3 Rxf3 Nd6+ 27 00:01 51.227 0 +71.65 Qf3 Rxf3 Nd6+ 28 00:01 53.855 0 +71.65 Qf3 Rxf3 Nd6+ 29 00:01 56.483 0 +71.65 Qf3 Rxf3 Nd6+ 30 00:01 59.111 0 +71.65 Qf3 Rxf3 Nd6+ 31 00:01 61.739 0 +71.65 Qf3 Rxf3 Nd6+ 32 00:01 64.367 0 +71.65 Qf3 Rxf3 Nd6+ ========================================= That's what I like about these "deep" positions. You never really know how deep the puddle can be. :-) Christopher
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