Author: leonid
Date: 14:22:40 02/15/00
Go up one level in this thread
On February 15, 2000 at 07:40:32, Andreas Stabel wrote: >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 Sometime very impossible position is good to have when you write your logic. It permit to find, generally speaking, if logic work well. Position with 9 queens, 6 rooks... I created many positions when I wrote my initial logic that generate legal moves. To see if everything goes well, positions that contain inevitable mate were ideal for debugging. Just by curiosity, how you reached your quit sofisticated positions, by "hand" or with usage of some program? Did you came to the creation of the position my way? I want to say that you started writing some logic and solving the positions was your way to find some responses. Or you just created your positions for fun since the beginning? Regards, Leonid.
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