Search found 802 matches

by elcabesa
Wed Jun 12, 2019 4:01 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Hash collision?
Replies: 42
Views: 6004

Re: Hash collision?

The total size of the table only comes in when the the table only gets partly filled. Yeah I have to agree. In that case, my objection was wrong. (you tacitly assume that by taking it for granted that a key length of 64 bits is enough to have no key collisions) That's an unrelated issue for the pro...
by elcabesa
Fri May 24, 2019 10:14 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Content of hash entry in perft
Replies: 1
Views: 924

Re: Content of hash entry in perft

in my impleentation I store, key, depth of the subtree, nodes of the subtree
by elcabesa
Sun May 12, 2019 9:15 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: syzygy request for info
Replies: 35
Views: 7700

Re: syzygy request for info

one year later I'm still here reading and studying syzygy. I have just seen that when first reading the files, the code read the PairsData, each pairsData contains an array of pieces with defines the order of pieces. I have just read KNNvKB files and and in all the pairsData struct contained the ord...
by elcabesa
Thu May 02, 2019 3:31 pm
Forum: Computer Chess Club: General Topics
Topic: Simple mate in 6 that gives some engines trouble
Replies: 20
Views: 3557

Re: Simple mate in 6 that gives some engines trouble

Vajolet finally found it after 45 minutes :)
by elcabesa
Sun Apr 28, 2019 12:20 pm
Forum: Computer Chess Club: General Topics
Topic: Test Position 31.Qh8!
Replies: 7
Views: 917

Re: Test Position 31.Qh8!

I'm not a big chess player, but what white cha achieve after Qh8! ? I let Stockfish and Vajolet search a lot but cannot din anython but draw
by elcabesa
Sat Apr 27, 2019 9:03 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: calculating seldepth
Replies: 2
Views: 632

Re: calculating seldepth

some engine calculate seldepth as the max depth reached in search/qsearch, some other (i.e. stockfish) calculate the max depth reached by a PV node
by elcabesa
Tue Apr 23, 2019 4:30 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: 7-man Syzygy support in Fathom
Replies: 8
Views: 1444

Re: 7-man Syzygy support in Fathom

jdart wrote:
Tue Apr 23, 2019 3:48 pm
Probably best to fork it/send a pull request.

--Jon
done, please check it :)
by elcabesa
Tue Apr 23, 2019 2:46 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: 7-man Syzygy support in Fathom
Replies: 8
Views: 1444

Re: 7-man Syzygy support in Fathom

jdart wrote:
Tue Apr 23, 2019 2:55 am
I have pushed a branch with changes to support 7-man tbs, here:
I Jon,
I have some small patch to your 6man code that will correct some warning reported by the compiler.

where can I send it? shall I fork your repository and create a pull request? os shall I send a patch file?
by elcabesa
Sun Apr 21, 2019 8:37 am
Forum: Computer Chess Club: General Topics
Topic: Contrived position for perft
Replies: 15
Views: 2945

Re: Contrived position for perft

another possibile source of problem is the interaction of "pin" and en passant. I think this is rare but it can happen.
here an example where en passant capture is forbidden (fxe3)