Author: Uri Blass
Date: 07:40:12 03/15/02
Go up one level in this thread
On March 15, 2002 at 01:23:43, Ed Schröder wrote: >On March 14, 2002 at 20:19:58, Art Basham wrote: > >>Someone here posted this problem about 2 months ago, >>and I just "fell in love" with it..! >> >>White plays 1. Ne3-g4+ and mates in 30...WITHOUT a Queen on the board! >> >>Be sure to play this out to the end, and see the beauty found in this >>unique chess masterpiece! >> >>[D]5n2/B3K3/2p2Np1/4k3/7P/3bN1P1/2Prn1P1/1q6 w - - >> >>My Crafty engine ann. "mate in 30" in only 25 sec...! >> >>Have fun with it! >> >>Why not post your favorite chess problem here, >>Or, It may just be your favorite move in chess... >>the move that really surprised you, >>or "knocked your socks off" so to speak..! >> >>(The man who taught me how to play chess was my Latin and math teacher >>in H. S....If he were living today, he would be just thrilled to see >>what chess computors can do_! > > >It's a known position posted many times here, there are several chess programs >which solves this instantly, pick any Rebel version it will announce the mate in >less than a 1/10 of a second. > >Ed I have a special version of my program that can also do it but I am not going to use it in games. This special version needs only 4476 nodes to find the mate by extending 2 plies for every single reply that happens in the first 60 plies but it is a bad idea to use it in games because there are position when it can in theory crush at depth 1 because the attacker may have 10 possible moves to force single reply in every move and in 60 plies it may need 10^30 nodes. It is possible to decide to use that special version only for 10000 nodes and continue with the original version if that version does not find a mate. There will not be significant difference when you do not consider blitz but I do not like that solution. Here is the winboard.debug file of my special program: 61058 >first : black 61058 >first : time 30000 otim 30000 61058 >first : white go 61068 <first : Error (unknown command): black 61068 <first : Error (unknown command): white 61128 <first : 1 9941 6 4476 e3g4 e5f5 g4h6 f5e5 h6f7 e5f5 f7d6 f5e5 f6g4 e5d5 g4e3 d5e5 d6f7 e5e4 f7g5 e4e5 g5f3 e5e4 f3d2 e4e5 d2f3 e5e4 f3g5 e4e5 g5f7 e5e4 f7d6 e4e5 e3g4 e5d5 g4f6 d5e5 d6f7 e5f5 f7h6 f5e5 h6g4 e5f5 g4e3 f5e5 f6g4 e5e4 g4f2 e4e5 f2d3 e5e4 d3f2 e4e5 f2g4 e5e4 g4f6 e4e5 e3c4 e5f5 c4d6 f5e5 f6g4 e5d5 c2c4 61138 <first : move e3g4 GameEnds(0, (null), 2) Interrupting first 70071 >first : force 70071 >first : quit Uri
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