Search found 57 matches

by Ratosh
Thu Feb 21, 2019 12:01 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Top Engines without Piece-Square Tables?
Replies: 6
Views: 556

Re: Top Engines without Piece-Square Tables?

Hi Erin! I made an experiment on my engine, removing the PSQT for each piece on 5k games (This is the strength of my engine psqt): https://github.com/ratosh/pirarucu/projects/14 What i noticed from my experiment: - Knight psqt seems weak, i need to improve it; - Pawn psqt seems too strong, i need to...
by Ratosh
Wed Jan 30, 2019 12:51 pm
Forum: Computer Chess Club: Tournaments and Matches
Topic: CEO. Edition II.
Replies: 19
Views: 778

Re: CEO. Edition II.

Please include Pirarucu on Brazil.

Thanks
by Ratosh
Mon Jan 14, 2019 12:04 am
Forum: Computer Chess Club: Tournaments and Matches
Topic: Troubled Waters 4CPU
Replies: 16
Views: 1224

Re: Troubled Waters 4CPU

Thanks for the tournament Graham!
by Ratosh
Fri Jan 11, 2019 9:56 pm
Forum: Computer Chess Club: Tournaments and Matches
Topic: Troubled Waters 4CPU
Replies: 16
Views: 1224

Re: Troubled Waters 4CPU

Finally not last!
by Ratosh
Fri Jan 11, 2019 2:29 am
Forum: Computer Chess Club: General Topics
Topic: 101 KNNvKP mates
Replies: 3
Views: 384

Re: 101 KNNvKP mates

This position is a stalemate.

Code: Select all

3K3k/7p/7N/7N/8/8/8/8 b - -
by Ratosh
Mon Dec 31, 2018 4:53 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Bitboard question (from xiphos code)
Replies: 9
Views: 613

Re: Bitboard question (from xiphos code)

A few square tricks:
  • Invert the square rank: (square xor 56)
  • Relative square: (square xor color * 56)
  • Invert rank: (rank xor 7)
  • Relative rank: (rank xor color * 7)
  • Square file: (square and 7)
  • Square rank: (rank >> 3)
  • Mirror file: (file xor 7)