Author: Uri Blass
Date: 12:33:11 10/18/02
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On October 18, 2002 at 14:42:55, Heiner Marxen wrote: >On October 17, 2002 at 01:09:45, Jouni Uski wrote: > >>And other programs as well. >> >>[D]rnbQKbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBqkBNR w - - >> >>Alybadix 2002 solves this in unbelievable 21,3 sec (Athlon 1466 Mhz). Look at >>http://www.saunalahti.fi/~iblom/alybadix/ex2002.htm >> >>Jouni >> >>PS. Solution of course Nc3! > >That is correct. Chest on Athlon 1500+ with 128 MB hash needs 2 hours: ># 5 0.03s [ 3.00] 5kN [ 4.90] 1.36 337- 0 ># 6 0.09s [ 3.00] 19kN [ 3.57] 1.68 1164- 0 ># 7 0.37s [ 4.11] 73kN [ 3.89] 1.93 6250- 0 ># 8 1.92s [ 5.19] 386kN [ 5.29] 2.32 32241- 0 ># 9 17.29s [ 9.01] 3472kN [ 8.98] 2.32 312342- 0 ># 10 110.95s [ 6.42] 22525kN [ 6.49] 2.53 1893435- 14248 ># 11 1229.78s [ 11.08] 229968kN [ 10.21] 3.04 20799132- 17599899 ># 12 7333.75s [ 5.96] 1405765kN [ 6.11] 3.05 117945772- 114746539 > >PV: Nc3 Nf6+ Kxf7 Kxf1 Nf3+ Kxg2 Rxd1 Nc6 Rg1+ Kxf2 Nd1+ Kxe2 Nd4+ Nxd4 Qxc7 d6 >Qc4+ Kf3 Qd3+ Kf4 Qe3+ Kf5 Rg5# > >I'm not sure whether the comparison with Alybadix is completely fair. >On that web page I read (in red) /Q3+ which seems to indicate a search >restriction. Hence I suspect a shorter mate is not absolutely ruled out >by Alybadix. I understood from the site that it means that white has to play only checks or a threat of mate in at most 3 moves. Uri
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