Search found 1611 matches

by Gerd Isenberg
Mon Dec 03, 2018 8:05 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Extension stage in MCTS
Replies: 3
Views: 413

Re: Extension stage in MCTS

Guess you mean expansion strategy ... using the UCB1 formula, see
https://www.youtube.com/watch?v=UXW2yZndl7U
by Gerd Isenberg
Tue Nov 27, 2018 6:42 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: CCR board representation
Replies: 7
Views: 560

Re: CCR board representation

Yes, 128-bit xmm registers with SSE may be treated as vector of four floats or two doubles, as well since SSE2 as integer vectors of 16 bytes, eight words, four double words or two quad words. AVX or AVX2 two times more. There are 8 of these SIMD-registers in 32-bit mode, and 16 in 64-bit mode. http...
by Gerd Isenberg
Mon Nov 26, 2018 6:33 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: CCR board representation
Replies: 7
Views: 560

Re: CCR board representation

Good luck with CCR, you may try using 256-bit ymm register of x86 AVX2 for one register boards, to make/unmake by board ^= tbl[enumMove] ;-) related cpw stuff: https://www.chessprogramming.org/Nibble#ArrayOfNibbles CCR with "vertical" nibbles: https://www.chessprogramming.org/Quad-Bitboards https://...
by Gerd Isenberg
Sat Nov 03, 2018 9:37 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Which author what engine?
Replies: 6
Views: 797

Re: Which author what engine?

Conversion and revisiting, replacing links etc. takes some time - most of the programming stuff is done. I still have a job and a bike ...
by Gerd Isenberg
Sun Aug 12, 2018 10:30 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Attacks From table
Replies: 12
Views: 1991

Re: Attacks From table

Hi Edsel,

with magic or pext bitboards, most use "On the Fly" generation ...

For some references see
https://www.chessprogramming.org/Attack_and_Defend_Maps

Good luck,
Gerd
by Gerd Isenberg
Tue Jul 03, 2018 8:19 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Chess Programming Wiki
Replies: 32
Views: 16249

Re: Chess Programming Wiki

I have noticed the announcement that Wikispaces, which is hosting the Chess Programming Wiki, is shutting down ( http://blog.wikispaces.com/ ). I hope there are plans to migrate the content elsewhere, because it has been a good resource and reference. --Jon We have wikitext backups, and some months...
by Gerd Isenberg
Tue Jun 05, 2018 9:02 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Bitboard for a non-chess game
Replies: 4
Views: 1093

Re: Bitboard for a non-chess game

The naive disjunctiv normal form approach would be, with some subexpressions to optimize oneEmptyNeighbor = ( occupied_shift_left & ~occupied_shift_down & ~occupied_shift_right & ~occupied_shift_up) | (~occupied_shift_left & occupied_shift_down & ~occupied_shift_right & ~occupied_shift_up) | (~occup...
by Gerd Isenberg
Fri Apr 20, 2018 11:30 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Chess Programming Wiki
Replies: 32
Views: 16249

Re: Chess Programming Wiki

CPW is under Creative Commons Attribution-ShareAlike 3.0 Unported (CC BY-SA 3.0).

The new wikimedia cpw makes good progress and will be available in about July with revisited and new content and links. No need to waste bandwidth or memory.
by Gerd Isenberg
Mon Mar 19, 2018 9:30 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Chess Programming Wiki
Replies: 32
Views: 16249

Re: Chess Programming Wiki

We have wikitext backups, and some months time to look for another host. How about digitalocean.com? They're $5/mo. and you get 25gb of ssd disk space, a full linux shell enviornment where you can install whatever you want. I would like to see the 'wikitext backup' for this page: https://chessprogr...
by Gerd Isenberg
Wed Feb 21, 2018 8:32 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Some opening book design questions
Replies: 39
Views: 8924

Re: Some opening book design questions

I wondered about this ymmetry business. In Chess you could also do BW mirroring. But no one I know does this, because in good Chess openings the mirrored positions just never occur. To reach them white would have to lose a tempo, and this is considered very bad in Chess. Is it really an advantage t...