Author: blass uri
Date: 13:05:53 10/12/98
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On October 12, 1998 at 14:25:08, Ernst A. Heinz wrote: >On October 12, 1998 at 01:23:51, Jouni Uski wrote: > >>These positions are from different magazines and books. Sorry, but format >>is Mchess7 "EPD". >> >>k7/8/2p5/4P3/4B3/6p1/8/2n3K1 w - - id "Bd3"; >>k1N5/2p5/8/1P6/8/8/7K/8 w - - id "Nb6+"; >>2n5/kP6/8/K7/4B3/8/8/8 w - - id "bxc8N+"; >>8/3Np3/7P/1p3P2/1k6/5K2/1b6/8 w - - id "f6"; >>2r5/2pR1pk1/p1P3p1/P2K4/5P1p/5P1P/8/8 w - - id "Rxc7"; >>8/1p5k/p1p4n/P6P/1P4N1/8/6K1/8 w - - id "Nxh6"; >>8/6pk/1p6/8/PP3p1p/5P2/4KP1q/3Q4 w - - id "Qf1"; >>8/2b2pp1/K2p4/p4P2/P7/6P1/8/2k3B1 w - - id "f6"; >>8/4k3/8/6r1/1KP5/8/8/7R w - - id "Rd1"; >>8/4kp2/4p1p1/2p1r3/PpP5/3R4/1P1K1PP1/8 w - - id "g4"; >>3k4/3q4/8/4Q3/5P2/6K1/8/8 b - - id "Qe7"; >>8/k7/8/2R5/8/4q3/8/4B2K w - - id "Bg3"; >>8/8/2N4p/p5kP/P1K5/1P6/8/4b3 w - - id "Nxa5"; >>8/8/pp6/3b2K1/1P6/PN2k3/8/8 w - - id "Na5"; >>3R4/2N2p1p/5kp1/r7/pb6/4P1P1/5P1P/6K1 b - - id "a3"; >>8/6Q1/p3r2p/3k3K/6P1/8/8/8 w - - id "Qxh7"; >>8/7p/3k2p1/6P1/4KP2/8/7P/8 w - - id "h4"; >>8/2p5/8/2kPKp1p/2p4P/2P5/3P4/8 w - - id "d6"; >>7K/k7/8/P7/6pP/8/8/8 w - - id "a6"; >>8/pKR5/8/p7/8/8/2p5/2k5 w - - id "Kb8"; >>k7/7K/NR6/8/7p/6p1/p7/8 w - - id "Nb8"; >>8/8/5p2/5p2/5P2/3p3B/5k1P/3K4 w - - id "Bg2"; >>8/1p6/4p3/1K2k3/8/P7/8/8 w - - id "Kc5"; >>4kr2/R4p2/6p1/8/1K6/3B4/8/8 w - - id "Bf5"; >> >>How many solves your program? For comparison Mchess7 10 min/pos in P90: >>solved 18/24. > >Dear Jouni, > >Thank you very much for collecting and posting the positions. > >With the help of its interior-node recognizers and its endgame databases >"DarkThought" solves 23/24 at 60 sec. per move on a 600MHz Alpha-21164a. > >The only position it does not solve is the following. > >> svfe k7/7K/NR6/8/7p/6p1/p7/8 w - - >> srch Nb8 > >Here, "DarkThought" suggests to play Nb4 which it evaluates as a draw. >If Nb8 also leads to a draw, "DarkThought" might have found a second >possible solution. I think that Nb8 is more simple draw because white can force repetition and does not have to play KRNvsKQ. Junior5 and fritz5 prefer after analysis Nb8 and reject Nb4. I think that the reason is that after Nb4 black can force KQvKRN and this draw is evaluated by the programs as advantage for black. Uri > >=Ernst=
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