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by hgm
Sat Jul 31, 2021 12:40 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: UCI's readyok: A mistake or a misunderstanding
Replies: 10
Views: 484

Re: UCI's readyok: A mistake or a misunderstanding

The readyok response should be sent whenever the input loop tries to execute a new command, and encounters the isready. During search the input loop should always be ready to accept a command, as a 'stop' could arrive.
by hgm
Tue Jul 27, 2021 4:54 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Fortress detection?
Replies: 9
Views: 2233

Re: Fortress detection?

Silver has one move, with the king in the top right, going back and forth. Silver has many moves. If he plays top-down, then he can (and I assume must) capture one of the Gold Kings, and moving the King on h8 would be illegal. So I assume he plays bottom-up. In which case he can move all of his che...
by hgm
Mon Jul 26, 2021 10:08 am
Forum: Computer Chess Club: General Topics
Topic: Moderator Elections
Replies: 33
Views: 8659

Re: Moderator Elections

TalkChess has been unreachable for a few days by many (including me), and I am not even sure the problem is solved for everyone. It is of course important that during the elections everyone should have an opportunity to vote. Anyway, because of this it seems unreasonable to strictly enforce the dead...
by hgm
Fri Jul 23, 2021 9:10 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Static exchange evaluation with promotion
Replies: 23
Views: 2674

Re: Static exchange evaluation with promotion

Shouldn't this be R+B-P? (bxc8=Q Bxc8 Rxc8)? My interpretation of SEE of a given move is that it is the result of a Quiesence Search that only takes moves to a given square into account.
by hgm
Fri Jul 23, 2021 4:35 pm
Forum: Computer Chess Club: General Topics
Topic: Stockfish: Our lawsuit against ChessBase
Replies: 232
Views: 19189

Re: Stockfish: Our lawsuit against ChessBase

But I assume the Stockfish source at GitHub to which they refer does contain such a copyright notice.

The comment seem to be about giving credit during marketing. I don't hink the GPL puts any conditions on how you market the program.
by hgm
Fri Jul 23, 2021 3:31 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Encoding chess rules into chess pieces
Replies: 2
Views: 1205

Re: Encoding chess rules into chess pieces

This appears to assume pieces are point symmetric, except that Pawns obviously aren't, and still use the system.

Note that the 'color' bit is redundant; you could use bit 5 of the ascii code (which distinguishes upper and lower case) for that.
by hgm
Fri Jul 23, 2021 3:22 pm
Forum: Computer Chess Club: General Topics
Topic: Stockfish: Our lawsuit against ChessBase
Replies: 232
Views: 19189

Re: Stockfish: Our lawsuit against ChessBase

Is 'giving credit' a condition of the GPL?
by hgm
Fri Jul 23, 2021 2:59 pm
Forum: Computer Chess Club: General Topics
Topic: Stockfish: Our lawsuit against ChessBase
Replies: 232
Views: 19189

Re: Stockfish: Our lawsuit against ChessBase

- FF2 runs on a slightly modified version of SF. This can be distributed in binary form according to the GPLv3 as long as you provide the source. See github, - Stockfish is credited prominently in the marketing copy of FF2. (I suspect they did that because Stockfish is a selling point, but that’s j...
by hgm
Fri Jul 23, 2021 2:49 pm
Forum: Computer Chess Club: General Topics
Topic: Stockfish: Our lawsuit against ChessBase
Replies: 232
Views: 19189

Re: Stockfish: Our lawsuit against ChessBase

KLc wrote:
Fri Jul 23, 2021 11:58 am
Did anyone notice that there is “Fat Fritz 2 SE” now? https://shop.chessbase.com/en/products/fat_fritz_2. It looks like they currently aren’t allowed to sell “Fat Fritz 2” anymore, so they just rebranded it. :D
"Silver Edition" ?
by hgm
Fri Jul 23, 2021 10:49 am
Forum: Computer Chess Club: General Topics
Topic: stockfish evaluates knight as more than rook
Replies: 14
Views: 1669

Re: stockfish evaluates knight as more than rook

It is more interesting to see how a position where one side lacks a Knight and the other a Rook would be evaluated.