Author: Victor Valenzia
Date: 14:04:37 04/16/00
Go up one level in this thread
On April 16, 2000 at 13:35:44, James Swinney wrote: >Here is a brilliant little problem that a friend of mine came up over 10 years >ago that we have tried on countless chess progams and none have ever figured >this out. I tried it on Fritz 5.32 with 64 meg hash tables overnight and it blew >up at the 41st ply !! >Here is the FEN >6bn/2k2prq/5prp/5pbn/5p1p/1Kp2PpP/2P3P1/8 w - - 0 1 > >The problem is white only sees that he is down tons of material and is quite >content to find a draw by perpetual check after queening his pawn. While a human >would see that all of blacks pieces are useless and play it out as a won king >and pawn ending. >Please try this and see what results you get. >James On a Pentium III 500 Mhz, Fritz 6a appears to recognize the locked position for black after 3 seconds, and sees an eventual win for white after 39 seconds. New position 6bn/2k2prq/5prp/5pbn/5p1p/1Kp2PpP/2P3P1/8 w - - 0 1 Analysis by Fritz 6: 1.Kxc3 -+ (-33.00) Depth: 1/1 00:00:00 1.Kxc3 -+ (-32.53) Depth: 1/2 00:00:00 1.Kxc3 Kd6 -+ (-32.53) Depth: 2/3 00:00:00 1.Kxc3 Kd6 2.Kd4 -+ (-32.44) Depth: 3/4 00:00:00 1.Kxc3 Kd6 2.Kd4 Ke6 -+ (-32.37) Depth: 4/5 00:00:00 1.Kxc3 Kd6 2.Kd4 Kd7 3.c4 -+ (-32.22) Depth: 5/7 00:00:00 1.Kxc3 Kd6 2.Kd4 Kd7 3.c4 Kc7 -+ (-32.16) Depth: 6/8 00:00:00 1.Kxc3 Kd6 2.Kd4 Kd7 3.c4 Kc6 4.c5 -+ (-32.09) Depth: 7/9 00:00:00 1.Kxc3 Kd6 2.Kd4 Kd7 3.c4 Kc7 4.c5 Kc6 -+ (-32.03) Depth: 8/11 00:00:00 1kN 1.Kxc3 Kd6 2.Kd4 Kd7 3.c4 Kc7 4.c5 Kc6 -+ (-32.03) Depth: 9/10 00:00:00 1kN 1.Kxc3 Kd6 2.Kd4 Kd7 3.c4 Kc7 4.c5 Kc6 -+ (-32.03) Depth: 10/11 00:00:00 2kN 1.Kxc3 Kd6 2.Kd4 Kd7 3.c4 Kc7 4.c5 Kc6 5.Kc4 Kc7 -+ (-31.97) Depth: 11/13 00:00:00 3kN 1.Kxc3 Kd6 2.Kd4 Kd7 3.c4 Kc7 4.c5 Kc6 5.Kc4 Kd7 -+ (-31.97) Depth: 12/15 00:00:00 5kN 1.Kxc3 Kd6 2.Kd4 Kd7 3.c4 Kc7 4.c5 Kc6 5.Kc4 Kd7 -+ (-31.78) Depth: 13/16 00:00:00 7kN 1.Kxc3 Kd6 2.Kd4 Kd7 3.c4 Kc7 4.c5 Kc6 5.Kc4 Kd7 -+ (-31.69) Depth: 14/16 00:00:00 10kN 1.Kxc3 Kd6 2.Kd4 Kd7 3.c4 Kc7 4.c5 Kc6 5.Kc4 Kd7 -+ (-31.69) Depth: 15/17 00:00:00 13kN 1.Kxc3! -+ (-31.37) Depth: 16/16 00:00:00 15kN 1.Kxc3! -+ (-31.06) Depth: 17/17 00:00:00 20kN 1.Kxc3-- -+ (-31.37) Depth: 18/18 00:00:00 30kN 1.Kxc3 -+ (-31.37) Depth: 18/18 00:00:00 30kN 1.Kc4 -+ (-31.22) Depth: 18/18 00:00:00 31kN 1.Kc4! -+ (-30.84) Depth: 19/19 00:00:00 38kN 1.Kc4 Kd6 -+ (-30.81) Depth: 19/19 00:00:00 39kN 1.Kc4 Kd6 2.Kxc3 Kc5 3.Kd3 Kd5 4.Kc3 Ke6 5.Kd4 Kd7 -+ (-30.81) Depth: 20/20 00:00:00 45kN 1.Kc4-- -+ (-31.16) Depth: 21/23 00:00:00 53kN 1.Kc4 -+ (-31.16) Depth: 21/23 00:00:00 54kN 1.Kb4 -+ (-31.06) Depth: 21/23 00:00:00 55kN 1.Kxc3 -+ (-31.03) Depth: 21/29 00:00:00 99kN 1.Kxc3 Kb7 2.Kd4 Kc6 3.c4 Kd6 4.c5+ Kc6 5.Kc4 Kd7 -+ (-24.81) Depth: 21/31 00:00:00 174kN 1.Kxc3 Kb7 2.Kd4 Kc6 3.c4 Kd6 4.c5+ Kc6 5.Kc4 Kd7 -+ (-24.81) Depth: 22/24 00:00:00 183kN 1.Kxc3-- -+ (-25.12) Depth: 23/36 00:00:00 259kN 1.Kxc3 -+ (-25.12) Depth: 23/36 00:00:00 266kN 1.Kxc3! -+ (-24.81) Depth: 24/24 00:00:01 267kN 1.Kxc3! -+ (-24.50) Depth: 25/31 00:00:01 281kN 1.Kxc3 Kb7 2.Kc4 Kc6 3.Kd4 Kb5 4.c4+ Ka5 5.c5 Kb5 -+ (-22.34) Depth: 25/37 00:00:01 512kN 1.Kxc3 Kb7 2.Kc4 Kc6 3.Kd4 -+ (-22.34) Depth: 26/37 00:00:01 601kN 1.Kxc3! -+ (-22.03) Depth: 27/35 00:00:01 650kN 1.Kxc3 Kb7 2.Kd4 Kc6 3.c3 Kd6 4.c4 Ke6 5.c5 Kd7 -+ (-22.31) Depth: 28/40 00:00:02 873kN 1.Kxc3 Kb7 2.Kd4 Kc6 3.c3 Kd6 4.c4 Kd7 5.Kd5 Kc7 -+ (-22.31) Depth: 29/41 00:00:02 1140kN 1.Kxc3! -+ (-22.00) Depth: 30/35 00:00:03 1309kN 1.Kxc3! -+ (-21.69) Depth: 31/38 00:00:03 1707kN 1.Kxc3! Kb7 2.Kd4 Ka6 3.c4 Kb6 4.Kd5 Ka5 5.c5 Kb4 = (0.00) Depth: 31/42 00:00:04 2129kN 1.Kxc3 Kb7 2.Kd4 Ka6 3.c4 Kb6 4.Kd5 Ka5 5.c5 Kb4 = (0.00) Depth: 32/45 00:00:08 4189kN 1.Kxc3 Kb7 2.Kd4 Ka6 3.c4 Kb6 4.Kd5 Ka5 5.c5 Kb4 = (0.00) Depth: 33/45 00:00:11 5994kN 1.Kxc3 Kb7 2.Kd4 Ka6 3.c4 Kb6 4.Kd5 Ka5 5.c5 Kb4 = (0.00) Depth: 34/53 00:00:18 10025kN 1.Kxc3 Kb7 2.Kd4 Ka6 3.c4 Kb6 4.Kd5 Ka5 5.c5 Kb4 = (0.00) Depth: 35/55 00:00:35 20541kN 1.Kxc3! +- (#100) Depth: 36/49 00:00:39 23210kN (Las Vegas 16.04.2000)
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