Author: José Carlos
Date: 05:44:58 09/21/00
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On September 21, 2000 at 00:38:37, Mike Adams wrote: > I want to thank those who offered suggestions for null move in Pulsar, in >perliminary tests it seems to be worth 50 points to do depth-3 over depth-2. >Also it no longer does null move while in check. > Pulsar manages to win many games by blitzing its opponent with tactics but >its often comeing from behind in very unsound positions it gets itself into. It >will let its queen wander to other side of board while its king is under viscous >attack. It has been known to place its pieces in very awkward positions with >little room for movement. The evaluate basicly only looks a things like 64 >grid poitions bonuses for knights, bishops, pawns. pawn structure such as passed >isolated and double pawns, and rooks on 7th rank and open files. It also has a >little king saftey in that it tries to preserve the pawns around its castled >kings and there is a 25 point bonus for castling. I preety much modled the >evaluate after the simple chess program and have not gone beyond that. Its >playing at 2100 blitz at moment on icc but can still lose to much lower rated >opponents who maybe allign all pieces on king and make a sacraftice at critical >move. Are there some things I can do without getting overly complicated at least >not at first that would improve it postionally. For example is there any way i >can use the moves it generates in the evaluate function to look for things like >piece mobility I use piece mobility. I just simply calculate how many moves can make the pieces (ignoring pawns, and counting the king only in the endgame). This was my first evaluation parameter (apart from material, of course). I've tried to get rid of it some times, cause it's slow, but I can't manage to remove it without hurting a lot the playing strength, so it's still there. King safety is difficult to implement, because you have to avoid being attacked, but eigther you have to avoid making unsound attacks. There are plenty of things to take into account, so try experimenting and see what happens. José C. >or pieces threatening the king? I have added a check extension >which seems to be helping king saftey but it still kicks in often late. Any >suggestions would be appreciated.
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