Search found 1215 matches

by mjlef
Tue Jul 03, 2007 7:12 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Delaying Extensions Idea (does anyone do this)?
Replies: 12
Views: 6391

Delaying Extensions Idea (does anyone do this)?

OK, here is my next screwy idea: Try to order the moves you search based not just on the likelihood of them being found best, but also based on how big a sub tree they will generate. In cutoff nodes, many moves can often lead to a cutoff. So, instead of say searching a capture move which might cause...
by mjlef
Mon Jul 02, 2007 12:48 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Ed Does it Again! (and a question for Ed)
Replies: 11
Views: 6862

Ed Does it Again! (and a question for Ed)

I see Ed has finished up his writeup on how Rebel plays chess: http://www.top-5000.nl/authors/rebel/chess840.htm Great stuff! Now I owe him even more meals. One section which concerns me a bit is this: <quote> Rule no. 1 in pawn endings: the side with a pawn up will win the game. The below code (or ...
by mjlef
Thu Jun 28, 2007 3:49 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: So far, only Glaurung 2 epsilon can find, within 21 ply
Replies: 13
Views: 6825

Re: So far, only Glaurung 2 epsilon can find, within 21 ply

Yes, you must have some kind of "unstopable passed pawn" rule in K&Ps endgames. Being out of the square of the pawn gets a lot of them. Another one is if you have two passed pawns, draw a square on the board as tall as the files apart the pawns are (a square). If this is the case, then one of the pa...
by mjlef
Wed Jun 27, 2007 6:58 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: So far, only Glaurung 2 epsilon can find, within 21 ply
Replies: 13
Views: 6825

Re: So far, only Glaurung 2 epsilon can find, within 21 ply

As a human, I can see instantly that NxN wins. (the fastest?) note: No table bases or bitbases used. Please do not suggest them as a valid answear to this question. I do not even know if they are warrented here. Glaurung 2 epsilon takes 20 ply to determine this. TogaII can not determine it, given 2...
by mjlef
Thu Jun 21, 2007 7:32 am
Forum: Computer Chess Club: General Topics
Topic: How Long?
Replies: 23
Views: 8026

Re: How Long?

Its already here. Rybka in a quad system. Also Zappa and probably a few others will do. Even Fritz, a relatively weaker engine, beat the well prepared world champion and didn't lose a single game However, there will always be weak programs, by beginner programmers, that will lose to most GMs Someon...
by mjlef
Thu Jun 21, 2007 7:28 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Polyglot and Vista
Replies: 1
Views: 1257

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: 6931

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: 4774

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: 4774

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: 4774

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...