Author: Ross Boyd
Date: 04:17:37 10/04/05
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On October 04, 2005 at 02:49:30, Alessandro Scotti wrote: >On October 04, 2005 at 02:35:29, Ross Boyd wrote: > >>I've had a user request for this feature. To be honest, it goes against the >>grain after toiling so hard for a handful of elo here and there. However, I plan >>to honour the request when T2 is released which is still a long way off yet. >> >>As you indicate, its not as simple as randomly pruning moves from ply 2. >> >>My user suggested two approaches. >>1. Make the search depth random between two adjustable depths- for example 3ply >>and 6ply. Apparently this method is used in Crafty SE... >>2. Make the engine choose ply 1 moves randomly but within a certain score range >>of the best move... so it would occasionally play poor moves that lead to lower >>positional scores without throwing pieces away. > >Hi Ross, >that's a possible approach, but I don't like to throw away information. Instead, >it should be possible to search all root moves at full depth and then pick one >according to its score *and* PV. >So if engine sees its score go up thanks to a tactical shot that gains material, >it can "overlook" that continuation and pick another line. Conversely, if it >finds a line where it goes down a piece with a capture that happens a couple of >moves down the PV it can play that and see if the opponent takes the chance. >There are other possibilities as well, to use for evaluation, e.g. leaving king, >rooks and queen in "forkable" positions, downplaying king safety a bit and so on >in order to increase the chance that a combination can be found... this should >help in getting fun I think. Hi Alessandro, yes that sounds good! I like the idea of making a sparring partner that rewards a certain skepticism. If there's anything that bugs me when playing computers its that horrible inevitable feeling that the computer never misses anything (tactically). Nowadays when I play a computer I like playing the older weaker dedicated units because they allow me to play a more natural game. Against tough computer opponents I tend to play anti-computer stuff which ruins the fun completely.
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