Author: Uri Blass
Date: 14:09:07 10/18/02
Go up one level in this thread
On October 18, 2002 at 17:00:21, F. Huber wrote: >On October 18, 2002 at 15:33:11, Uri Blass wrote: > >>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 > >And that´s exactly the point! With such restrictions you are able to get >almost _every_ time (you want) on a special problem - but that doesn´t >say _anything_ about the average solving times _without_ giving the program >such additional informations. >And I really would be interested, _who_ would know exactly _this_ restriction >_before_ solving this chess problem? (If knowing the solution before, why >using a mate solver at all ;-)) Knowing is impossible but it is possible to guess. I think that having an option to restrict the search is productive. Of course comparing times of it with times of chest is meaningless. Uri
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