Search found 1200 matches

by mjlef
Thu Jun 21, 2007 7:28 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Polyglot and Vista
Replies: 1
Views: 1188

Polyglot and Vista

When I use winboard and polyglot on a Vista machine to play on ICC, polyglot often crashes immediately on startup. I guess this happens close to half the time it starts up. SInce I have a batch file with a loop it eventually does start OK. Does anyone else have this problem? All was fine on my XP ma...
by mjlef
Thu Jun 21, 2007 7:26 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: How much disk space on your development machine?
Replies: 13
Views: 6756

Re: How much disk space on your development machine?

Yes, and you have to buy these in pairs as the only practical way to back up a 1 TB drive is to copy its contents to another 1 TB drive. Other than a high definition video library, is there any mainstream application that needs one or more terabytes of storage? If flash memory technology keeps up i...
by mjlef
Thu Jun 21, 2007 7:19 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Is this rule safe (how has K&Ps vs K&Ps databases? t
Replies: 8
Views: 4595

Re: Is this rule safe (how has K&Ps vs K&Ps database

[D]8/4k3/6P1/4K3/1p6/p7/P7/8 w - - 0 1 Ignoring the Q-side pawns, White or Black to move would be a win for White. With the Q-side pawns, however, it is Black that will win with either side to move. Great position. Maybe I can fix my rules by looking for pawns that could soon be passers for the oth...
by mjlef
Thu Jun 21, 2007 7:17 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Is this rule safe (how has K&Ps vs K&Ps databases? t
Replies: 8
Views: 4595

Re: Is this rule safe (how has K&Ps vs K&Ps database

Here is a very old rule I have had in NOW: If you are in a King and Pawns versus King and Pawns endgame AND for each passed pawn, ignoring the other pawns, lookup the position of that passed pawn and the kings in a KPK database for both sides to move AND if the position shows as a win for both side...
by mjlef
Wed Jun 20, 2007 2:51 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Is this rule safe (how has K&Ps vs K&Ps databases? t
Replies: 8
Views: 4595

Is this rule safe (how has K&Ps vs K&Ps databases? t

Here is a very old rule I have had in NOW: If you are in a King and Pawns versus King and Pawns endgame AND for each passed pawn, ignoring the other pawns, lookup the position of that passed pawn and the kings in a KPK database for both sides to move AND if the position shows as a win for both sides...
by mjlef
Tue Jun 19, 2007 7:43 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: A personal introduction
Replies: 4
Views: 2771

Re: A personal introduction

I see Ed added stuff for pawn evaulations to his great Rebel writeup. Now I owe him at least 2 nice meals! Great stuff. Thanks Ed!

http://www.top-5000.nl/authors/rebel/chess840.htm

I cannot wait for the Passed Pawn stuff. I think that will land him a lobster and steak!

Mark
by mjlef
Mon Jun 11, 2007 7:23 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: what is the current slope of the curve
Replies: 5
Views: 3424

Re: what is the current slope of the curve

The "sahpe of the curve" is a lot harder to judge now. Programs using Late Move Reductions, Null Move Reductions and other pruning typically have a branching factor of about 2 versus something like 6 for a traditional program. Of course these reductions mean the length of the tree varies a lot, and ...
by mjlef
Mon Jun 11, 2007 7:19 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Performance Variance due to C++
Replies: 7
Views: 4260

Re: Performance Variance due to C++

I noticed the other day that if I load two copies of an identical program into the same GUI, the program sometiems take different amounts of memory. I am not sure why...I do not have them set to different hash table sizes. Maybe there is not enough physical memory left and one process gets less memo...
by mjlef
Sun Jun 10, 2007 7:34 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Revisiting Check Extensions
Replies: 18
Views: 10395

Re: Revisiting Check Extensions

Basing this on material has a couple of dangers: (1) if you don't extend checks that lose material, what happens to you on positions like WAC 141 where the key move tosses the queen for no apparent gain? I see no reason why people here keep giving single exceptional positions when new ideas are pre...
by mjlef
Sat Jun 09, 2007 8:04 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Revisiting Check Extensions
Replies: 18
Views: 10395

Re: Revisiting Check Extensions

Basing this on material has a couple of dangers: (1) if you don't extend checks that lose material, what happens to you on positions like WAC 141 where the key move tosses the queen for no apparent gain? I see no reason why people here keep giving single exceptional positions when new ideas are pre...