Search found 17829 matches

by hgm
Thu Sep 19, 2019 9:48 pm
Forum: Computer Chess Club: General Topics
Topic: Chest for Linux
Replies: 26
Views: 762

Re: Chest for Linux

But how would you know? The engine analysis you do at the end evaluates both the positions of the loaded game, as well as any recorded deviations you entered, and displays them side by side? A first step towards what you describe would be not to merely display the popup "incorrect move" in XBoard's ...
by hgm
Thu Sep 19, 2019 7:54 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Basic endgames
Replies: 16
Views: 610

Re: Basic endgames

Fairy-Max 5 uses a special PST for bare Kings, which increases the centralization bonus by a factor up to 11 compared to that of the opponent pieces. This was needed to make it win end-games where many weak pieces (all drawing to the center) have to cooperate in order to drive the bare King into a c...
by hgm
Wed Sep 18, 2019 5:14 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: self test
Replies: 8
Views: 281

Re: self test

This is also a general concern; in a sense every test against other alpha-beta engines is a self-test, as these engines are so much alike ('incestuous testing'). So what we think is a huge improvement, in the end resulting in Elos rising from 1800 to 3300 or more, might be -500 Elo when tested again...
by hgm
Wed Sep 18, 2019 5:06 pm
Forum: Computer Chess Club: General Topics
Topic: Chest for Linux
Replies: 26
Views: 762

Re: Chest for Linux

This is very primitive. What if users move is same or better than the played move ? One can implement what I said that exist in ChessBase and my more suggestions in this thread. I think that is the way to develop XBoard. Indeed, this is very basic (as well as very old and never further developed). ...
by hgm
Wed Sep 18, 2019 3:23 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Basic endgames
Replies: 16
Views: 610

Re: Basic endgames

There are two ways to handle this. You can program the knowledge into the evaluation, detecting the KQKP case with a 7th-rank a-, c-, f- or h-Pawn, and scoring it as drawish when the King supporting the Pawn is next to the promotion square, and the other far-enough away from it. A more general way w...
by hgm
Wed Sep 18, 2019 3:03 pm
Forum: Computer Chess Club: General Topics
Topic: Chest for Linux
Replies: 26
Views: 762

Re: Chest for Linux

This sounds like XBoard training mode. You load a game, select 'Training' in the Mode menu. From then on you can play a move. If it is not the one of the game you get a pop-up saying 'Incorrect move', and the entered move is ignored/taken back. If it is the move of the game, the move is accepted, th...
by hgm
Tue Sep 17, 2019 12:27 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Basic endgames
Replies: 16
Views: 610

Re: Basic endgames

This is pretty basic. Fairy-Max needs 12 ply (0.23 sec). It only has King centralization in its evaluation (although weighted more for the bare King). 13 #7 916826 0:00.42 a5a7 e8f8 e4e5 f8e8 e5d6 e8f8 d6e6 f8g8 e6f6 g8h8 f6g6 h8g8 a7a8 12 #7 534095 0:00.23 a5a7 e8f8 e4e5 f8e8 e5d6 e8f8 d6e6 11 +4.4...
by hgm
Tue Sep 17, 2019 10:04 am
Forum: Computer Chess Club: General Topics
Topic: Chest for Linux
Replies: 26
Views: 762

Re: Chest for Linux

I am not sure what all this means. You choose to play a color. So who plays the other color? And when? And what? If the other color would never move, you would not be able to progress very far from the initial position... Is the idea that the moves you enter are not really played, but just added to ...
by hgm
Mon Sep 16, 2019 2:45 pm
Forum: Computer Chess Club: General Topics
Topic: Chest for Linux
Replies: 26
Views: 762

Re: Chest for Linux

I have no idea what you mean by 'advanced replay training'. I don't have any ChessBase GUI. I know that XBoard (in addition to the possibility to 'auto-play' through existing games, or just step through those manually) has a 'training mode'. I have never used it, so I am not 100% sure what it does, ...
by hgm
Mon Sep 16, 2019 2:27 pm
Forum: Computer Chess Club: General Topics
Topic: RofChade and ponder
Replies: 14
Views: 588

Re: RofChade and ponder

That indeed is a bit strange. One would not expect there to be any reason to spontaneously terminate a ponder search if a forced game end is not in sight. It could be that some timeout is applied erroneously in the ponder search rather than just while thinking.