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K2 ¹

K2,
an open source chess engine by Sergey Meus, written in C++ and released under the GPL v2.0. K2 supports both UCI and the Chess Engine Communication Protocol.

Features

¹

Board Representation

• 8x8 Board
  • Pieces
  • Attack Table

Search

• Iterative Deepening
• Aspiration Windows
• Principal Variation Search
• Transposition Table
• Move Ordering
  • Hash Move
  • SEE
  • Killer Heuristic
  • History Heuristic
• Selectivity
  • Check Extensions
  • Recapture Extensions
  • One Reply Extensions
  • Null Move Pruning
  • Late Move Reductions
  • Late Move Pruning
  • Futility Pruning
  • Quiescence Search
    • SEE Pruning
    • Delta Pruning

Evaluation

• Tapered Eval
• Material
  • Bishop Pair
• Piece-Square Tables
• Mobility
  • Rooks on (Semi) Open Files
  • Rook on 7th (8th) Rank
• Pawn Structure
  • Passed Pawn
    • Connected Passed Pawns
    • Unstoppable Passer
  • Doubled Pawn
  • Isolated Pawn
  • Holes
• King Safety
  • Pawn Shield
  • Attacking King Zone

See also

• J. Biit
• Vajolet

Forum Posts

2014 ...

• K2 Chess Engine v0.57 by Norbert Raimund Leisner, CCC, July 09, 2014
• K2 Chess Engine 0.63 release by Norbert Raimund Leisner, CCC, September 14, 2014
• K2 Chess Engine v0.75 release by Norbert Raimund Leisner, CCC, May 07, 2015
• K2 Chess Engine by Sergey Meus, CCC, July 24, 2018 (v0.91)

Re: K2 Chess Engine by Sergey Meus, CCC, July 04, 2019 (v0.95)

2020 ...

• Re: K2 Chess Engine by Sergey Meus, CCC, January 01, 2021 (v0.99)

External Links

Chess Program

• GitHub - serg-meus/k2: Chess engine with UCI and Xboard interface
• K2 from CCRL 40/15

Misc

• K2 from Wikipedia
• K2 (disambiguation) from Wikipedia

References