Author: milix
Date: 11:17:45 03/17/04
Go up one level in this thread
On March 17, 2004 at 11:02:13, Renze Steenhuisen wrote: >On March 17, 2004 at 05:26:50, milix wrote: > >>On March 17, 2004 at 04:58:06, Peter Alloysius wrote: >> >>>what are tricks for evaluation tuning so that it could >>>search less nodes? >>> >>>i noted that my engine use exactly same move ordering scheme as >>>crafty but it still search much more nodes. >>>my engine also use adaptive null move, and futility pruning. >>> >>>so i think the problem is on evaluation tuning. >>>i heard that tuning evaluation function can reduces node searched, >>>so what's the trick? >> >>I think that there is no special trick. A bad evaluation will missguide the >>search. When I turn off the positional evaluation (and have only material+piece >>square scores) my engine is doing too many researches and the move ordering is >>also very bad. Same effect if I alter a positinal characteristic too much, like >>giving a very big bonus in advanced pawns or penalize bad king safety too much. > >If you turn positional evaluation off, what are typical numbers for >move-ordering? Because this is exactly what I do for now, but the History >Heuristic nor Killer Heuristic don't give very nice move-ordering %'s! > >Thanks! > >Renze I think both heuristics are suffer for bad evaluation especially when going deeper in the search tree. To test the bad behaviour of a weak evaluation you can set the rook value to 2 pawns and see what happens in your search especially in middle-game to end-game positions.
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.