Author: Andreas Stabel
Date: 04:40:32 02/15/00
Go up one level in this thread
On February 14, 2000 at 17:39:42, leonid wrote: >On February 14, 2000 at 11:29:23, Heiner Marxen wrote: > >>On February 14, 2000 at 05:08:22, Andreas Stabel wrote: >> >>>On February 13, 2000 at 18:02:20, James T. Walker wrote: >>> >>>>On February 12, 2000 at 10:18:44, leonid wrote: >>>> >>> >>>> >>>>This is from George Koltanowski's book "TV Chess". It is a mate in 10 with 4 >>>>underpromotions to a Knight. It is one of my favorites. I was surprised to >>>>find in the late 80's that the Fidelity Champion Sensory Challenger would solve >>>>this problem in about 42 seconds. Todays programs will solve this in less than >>>>1 second. >>>> >>>>[D]7K/P1p1p1p1/2P1P1Pk/6pP/3p2P1/1P6/3P4/8 w - - 0 1 >>>> >>>>Jim Walker >>> >>>This is a nice variation on the same position the I made from another >>>variation on this position :) >>>Note the nice queen moves at the end, and that promoting to a knight the >>>third time will not work. >>> >>>[D]8/1p1p1p1p/3P1P2/pp5P/kp6/1p4P1/1P4P1/2K5 w - - 0 1 >>> >>>Regards >>>Andreas Stabel >> >>Ah, I like it! It is a mate in 16. Chest on P/133 with 10 MB hash table >>needs 1.15 seconds to find the main variation: >> >> g4 h6 g5 hxg5 h6 b6 h7 g4 h8=N g3 Ng6 fxg6 f7 g5 f8=N >> g4 Ne6 dxe6 d7 e5 d8=Q e4 Qb8 e3 Qxg3 e2 Kd2 =*= Qxe1 g3 Qa1# >> >>Complete solution tree in 1.67 seconds. Wow. >> >>Heiner > >Now I see why my logic could not touch it. It is too deep to see. My mate logic >goes only 13 moves deep. But compose position as deep as 16 moves is a real >challenge. Well done! > >Leonid. Thanks, my only regret is that this is an illegal position. The configuration of black pawns can never be reached in an actual game. Notice the nice mate in 6 for white if black answers 1. g4 with 1... b6 ! The position I made this problem from is the following with white to move and win. Note that it is NOT a mate in n problem. [D]8/pp1p1p2/1p1P1P2/k7/8/1p4p1/1P4PP/2K5 w - - 0 1 Here it will work to promote to a knight the last time also, but if you choose to promote to a queen, the mate will be the same as in my mate in 16 problem. This is of course asuming that plays for a stalemate, and close up the king position completely. Best regards Andreas Stabel
This page took 0 seconds to execute
Last modified: Thu, 15 Apr 21 08:11:13 -0700
Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.