Weini

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Weini,

a Chess Engine Communication Protocol compliant open source chess engine by Vivien Clauzon. The project started in December 2016, and became a kind of interactive forum development when its author asked for advice one year later [1]. Many features were implemented and tuned over the time, many techniqes were tried, possibly starting suffering maintainability, and desire for a re-write [2]. Weini is an acronym for WisEness Is Not Inside [3].

Board Representation

• Mailbox
• Bitboards

Search

• Lazy SMP
• Iterative Deepening
• Aspiration Windows
• Principal Variation Search
• Transposition Table
• Selectivity
  • Extensions
    • Check Extensions
    • Single Reply Extensions
    • Singular Extensions
    • Recapture Extensions
    • PV Extensions
    • Passed Pawn Extensions
    • Promotions
    • Late Endgame Transitions
  • Reductions
    • Late Move Reductions
    • Razoring
  • Pruning
    • Adaptive Null Move Pruning
    • ProbCut
    • Static Null Move Pruning
    • Futility Pruning
    • Extended Futility Pruning
    • Move Count Based Pruning (Late Move Pruning)
  • Quiescence Search
    • Delta Pruning
    • SEE Pruning
• Move Ordering
  • PV-Move
  • Killer Heuristic
  • History Heuristic
  • Countermove Heuristic
  • Piece-Square Tables
  • Last Moved Piece Capture Bonus
  • MVV/LVA
  • Static Exchange Evaluation
  • Check Priority
  • En passant Priority

Evaluation

• Evaluation Hash Table
• Tapered Eval ( Float)
• Material
  • Bishop Pair
  • Trade Down Bonus
• Piece-Square Tables
• Development
• Center Control
• Mobility
  • Rook on Seventh
  • Trapped Pieces
  • Bad Bishop
• Pawn Structure
  • Pawn Hash Table
  • Doubled Pawn
  • Isolated Pawn
  • Passed Pawn
    • Connected Passed Pawns
    • Candidate Passed Pawn
    • Outside Passed Pawn
    • Protected Passed Pawn
• King Safety
  • Pawn Shield
  • Pawn Storm
  • King Piece Tropism
  • Castling

Automated Tuning

• CLOP
• Texel’s Tuning Method

See also#

• Minic

Forum Posts#

• Looking for advices by Vivien Clauzon, CCC, December 08, 2017

Re: Looking for advices by Vivien Clauzon, CCC, March 25, 2018

• Horizon effect and extensions by Vivien Clauzon, CCC, June 25, 2018 » Horizon Effect, Extensions
• Weini questions by Gabor Szots, CCC, August 08, 2018
• Weini 0.0.24 release by Vivien Clauzon, CCC, October 20, 2018

External Links#

• GitHub - tryingsomestuff/Weini
• Weini in CCRL 40/40

References#

1. ↑ Looking for advices by Vivien Clauzon, CCC, December 08, 2017
2. ↑ A complete 2000 lines of code engine by Vivien Clauzon, CCC, October 20, 2018
3. ↑ Re: Weini questions by Vivien Clauzon, CCC, August 08, 2018
4. ↑ based on Weini/README.md at master · tryingsomestuff/Weini · GitHub and sources of Weini-0.0.24

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