Author: Kai Lübke
Date: 02:57:27 03/09/98
Go up one level in this thread
On March 08, 1998 at 05:39:33, Uwe Immel wrote: >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" >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). I use "Infinite Analysis" (Alt-F2) for my testing and Junior solved the above position at 4:50 in ply 15. It's possible that Junior readjusts some internal values (read: the way it searches) depending on the given reflection time - Amir is probably the only authority to comment on this. BTW, any reason why using "Infinite Analysis" for longer analysis is bad? I think I heard something about a 999 second limit or something? --- Shep
This page took 0 seconds to execute
Last modified: Thu, 15 Apr 21 08:11:13 -0700
Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.