Author: Stuart Cracraft
Date: 10:55:52 07/06/04
Go up one level in this thread
On July 06, 2004 at 13:33:27, Russell Reagan wrote: >On July 06, 2004 at 13:15:33, Martin Giepmans wrote: > >>>>EFFORT RETURN VALUE Feature >>>>1 1 1 capture ordering >>>>3 1 3 null move >>>>2 2 4 null move with verification >>>>4 2 6 search pv first >>>>5 1 5 static exchange evaluator >>>>4 1 4 transposition table >>>>3 2 6 transposition table with 2-tier replacement >>>>3 2 6 history heuristic, killers, other ordering >>>>2 3 6 aspiration >>>>2 2 4 iterative deepening >>>>2 2 4 pawn hashing w/ complex pawn evaluation >>>>2 3 9 capture extension >>>>1 1 1 check extension >>>>1 5 5 pawn to 6th/7th extension >>>>3 3 9 futility >>>>3 3 9 razoring >>>>5 3 15 mate-at-a-glance > >>What I understand from Stuart is that better features have _lower_ values, not >>higher. >>This is a bit couter-intuitive, perhaps a word like 'priority' would be better >>than 'value'. For instance, mate-at-a glance has the lowest priority (15). >> >>Martin > >I think the 'value' column is meaningless as it currently exists. For instance, >if some feature has an effort of 3 and a return of 1, that's not a good value. >You spend a lot and get only a little. If you spend 1 and get 3, that is a good >value. You spend a little and get a lot. Currently, they both get a 'value' of >3, so they are equal. That's not right. > >Maybe a ratio would be better? Return/Effort would be better, I think. In the >situation just described, it would be 1/3 = 0.3333 vs. 3/1 = 3.0000. That gives >a much clearer picture about what will give you a better value for your time >invested. >>>EFFORT RETURN RATIOFeature >>>1 1 1 capture ordering >>>3 1 3 null move >>>2 2 4 null move with verification >>>4 2 6 search pv first >>>5 1 5 static exchange evaluator >>>4 1 4 transposition table >>>3 2 6 transposition table with 2-tier replacement >>>3 2 6 history heuristic, killers, other ordering >>>2 3 6 aspiration >>>2 2 4 iterative deepening >>>2 2 4 pawn hashing w/ complex pawn evaluation >>>3 3 1 capture extension >>>1 1 1 check extension >>>1 5 5 pawn to 6th/7th extension >>>3 3 9 futility >>>3 3 9 razoring >>>5 3 15 mate-at-a-glance
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