Author: Uwe Immel
Date: 02:39:33 03/08/98
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On March 06, 1998 at 07:31:30, Kai Lübke wrote: >The following position (probably not unknown to many who followed >the WMCCC in Paris) is from the Dark Thought vs. MChess 7 game in Paris. >In this situation, MChess 7 played Rc4!! > >2r2kn1/1p3pr1/pq2p3/3pP2N/b4P1P/PnPQ4/1B4P1/1R2KB1R b k - ; bm Rc4; id >"shep06" > >I have tested all current top programs on this, and they all find >the solution between 1:52 (Hiarcs 6) and 13:58 (Rebel 9, all on P6-200). >Their evaluations are between -0,62 (Hiarcs 6) and -0,25 (Fritz 5, Rebel >9). >Now Junior 4.6 (engine) finds this in 4:08, and after 4:50 it is the >only program so far to return a positive score for black: +0,23. > >Maybe we'll soon have a program that actually scores this as a clear >win. At least we're one step closer now. :) > >Another "Hooray!" for Amir! > >--- >Shep (full details... you know the place :) By trying the mentioned position, I noticed some kind of strange behavior of Junior. In lack of Fritz having an infinite level, I normally use the fixed depth level (=99) for long analysis. This dosn't work proper by using the Junior engine, because it takes a few minutes 'til Junior shows any information. For example setting ply depth 15, I have to wait about 14 minutes until Junior shows his evaluation and pv, at depth 14 it almost takes 4 minutes. The span of time increases with every further ply, so I didn't try ply 99 ;-) Not a huge problem so far as you can alternative use the time per move level, but then the following difference comes up, that at fixed ply depth 13 Junior finds the move Rc4 in 2:55 (Cyrix 166+) and at level 3600 sec/move the keymove is not found within 17 ply ! At level 600 sec/move Rc4 is found at ply 14 in 7:58. Either Junior does another search on fixed depth level or it's a kind of coincidence by forcing Junior to think only to ply 13. However, I'm not sure which level to use to get the (suppposed) best move in shortest time (especially for longer analysis). Any ideas ? regards Uwe
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