Author: Alessandro Scotti
Date: 13:49:44 08/25/04
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On August 25, 2004 at 12:52:46, Volker Böhm wrote: > >Hi, > >the following position of the iq - test (position 166) cannot be solved from >spike in reasonalbe time (> 2h): > >r4r1k/6pp/3p3b/1p1Npb2/3nB2q/2N3P1/PP3P1P/R2Q1RK1 b - - 0 1 > >(The move to find is Qxe4) On my Athlon 700 MHz my program finds the move in less than 12 seconds with a small score but then sticks to it and the score grows: PV: 7 25 150 0 Qg4 Qxg4 Bxg4 Nf6 gxf6 Bxa8 Rxa8 PV: 8 40 435 0 Qg4 a3 Rae8 Qxg4 Bxg4 Nc7 Re7 N3xb5 PV: 9 35 809 0 Qg4 a3 Qxd1 Raxd1 Bg4 Rxd4 exd4 Nxb5 Bc1 PV: 9 40 1138 0 Qxe4 Nxe4 Bxe4 Nc3 Bf3 Qd3 b4 Nb1 Ne2+ Qxe2 PV: 10 55 1627 0 Qxe4 Nxe4 Bxe4 Nc3 Bf3 Qd3 b4 a3 bxc3 Qxc3 PV: 11 135 4375 0 Qxe4 Nxe4 Bxe4 Nc7 Bf3 Qxd4 exd4 Nxa8 Rxa8 Rfe1 PV: 11 165 5756 0 Qxe4 Nxe4 Bxe4 Nc3 Bf3 Qb1 b4 Re1 bxc3 bxc3 Queen value is 900 here, if I switch to the second set where the value is 1100 then the move is not found. For the null move, here are the program stats after 60 seconds: Calls to GenMoves : 615110 Calls to Evaluation : 11109295 Null move cutoffs : 490300 / 571726 (85.7%) Nodes searched : 23459999 Positions generated : 11070319 Positions tried invalid: 755979 Hash probes failed : 2368441 / 11430883 Pawn hash probes failed: 148926 / 11109295 Pawn hash stores : 297852 Failed high at 1st try : 88.0% Failed high at 2nd try : 04.5% test: ended in 59996 ms
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