Search found 17881 matches

by hgm
Mon Oct 07, 2019 2:51 pm
Forum: Computer Chess Club: General Topics
Topic: is this a fortress?
Replies: 17
Views: 1523

Re: is this a fortress?

Seems to me white abandons the fortress without any reason, and blunders away a Pawn in the process.

Not sure what this 'fortress code' does, but it doesn't seem to be much good.
by hgm
Mon Oct 07, 2019 9:36 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: PGN standard, its improvement and standardization
Replies: 46
Views: 2380

Re: PGN standard, its improvement and standardization

Hiding such a PV in a normal comment (within braces) hides these from the normal display mechanisms, and thusshould be considered a very bad practice. Unfortunately the PV often coincides with the following moves of the game, and many GUIs don't support having distinct variations for the same moves...
by hgm
Mon Oct 07, 2019 8:05 am
Forum: Computer Chess Club: General Topics
Topic: is this a fortress?
Replies: 17
Views: 1523

Re: is this a fortress?

It seems easy for white to hold a draw here. But why do you even think black is better? Probably white should play for a win here. But black is lucky that the white KIng is susceptile to perpetual check.
by hgm
Mon Oct 07, 2019 7:51 am
Forum: Computer Chess Club: General Topics
Topic: question about weak level of engines
Replies: 9
Views: 865

Re: question about weak level of engines

N.E.G. is much stronger than a random mover (it should beat one by nearly 99% or so), and highly randomizes its moves. That is, when there is something to randomize: if it can (re)capture in only one way, it will of course do it, and not consider moves that throw away material just to randomize. But...
by hgm
Mon Oct 07, 2019 7:39 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: PGN standard, its improvement and standardization
Replies: 46
Views: 2380

Re: PGN standard, its improvement and standardization

WinBoard/XBoard (and also Arena, I believe) use the convention that in a comment starting with <signed floating-point number>/<integer-number> these numbers indicate the score and search depth used by an engine to obtain the move before the comment. It can be optionally followed by a space and time ...
by hgm
Sun Oct 06, 2019 6:43 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: PGN standard, its improvement and standardization
Replies: 46
Views: 2380

Re: PGN standard, its improvement and standardization

Make sure to include the following tags:

* Variant
possible values e.g. suicide, atomic, capablanca, omega, xiangi, shogi, ...

* VariantMen
value is a comma-separated list of <piece id> : <Betza move descriptor> pairs for all unorthodox pieces participating in the game
by hgm
Sun Oct 06, 2019 4:23 pm
Forum: Computer Chess Club: General Topics
Topic: Posted something in EO
Replies: 9
Views: 1200

Re: Posted something in EO

Hiding your complaints deep in a thread with another title is not likely to do better, though.

If you start a thread with an appropriate title in the Help & Suggestions section, the title will remain visible for everyone opening the index page for months...
by hgm
Sun Oct 06, 2019 9:57 am
Forum: Computer Chess Club: General Topics
Topic: Are there any major Android Apps that support Winboard Protocol Engines?
Replies: 4
Views: 469

Re: Are there any major Android Apps that support Winboard Protocol Engines?

It doesn't support variants, though, AFAIK. Variant Stockfish is still UCI. We adopted an extension of the UCI protocol for handling variants, through a UCI_Variants option, and a possible "info string variant ..." reply to it for configuring the GUI. AFAIK only the UCI2WB adapter and the CuteChess ...
by hgm
Sun Oct 06, 2019 9:49 am
Forum: Computer Chess Club: General Topics
Topic: Is this IMPOSSIBLE with BIN books?
Replies: 6
Views: 636

Re: Is this IMPOSSIBLE with BIN books?

Books just hold the relative preference of the moves from a given position. Where 'position' means current board position disregarding any prior history. So if you include a line with a repeat loop as best moves in the book, and set it to only play best moves, it would recommend the repeat, as there...
by hgm
Fri Oct 04, 2019 1:18 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Looking for TT policy advice
Replies: 23
Views: 1302

Re: Looking for TT policy advice

At short TC the entire tree often fits in the TT, so the replacement algorithm does not matter as it is hardly exercised. My exprience is that you only start to notice a slowdown if you shrink the TT size to less than 10% of the node count, even with rather simple replacement schemes. For running wi...