JikChess

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JikChess,
a Chess Engine Communication Protocol compliant chess engine by Janne I. Kokkala, written in C++11. Its development started in early 2013, and the first version was released in November 2014 ¹.

Features

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Search

• Iterative Deepening
• Aspiration Windows
• Alpha-Beta PVS
• Selectivity
  • Null Move Pruning
  • Late Move Reductions
  • Extended Futility Pruning
  • Quiescence Search with Captures and Promotions only
  • Check Extensions
  • Fractional Ply PV Extensions
• Move Ordering
  • Transposition Table
  • Captures by SEE
  • Killer Heuristic
  • Internal Iterative Deepening

Evaluation

• Linear Combination of Numerical Positional Features
• Tapered Eval
• Pawn Hash Table
• Automated Tuning
  • Logistic Regression (Similar to Texel's Tuning Method)
  • Regularization - Prior added to the Cost Function (encourages unimportant parameters to become zero)

Misc

• PolyGlot Opening Book
• Gaviota Tablebases

Forum Posts

• JikChess 0.01 by Janne I. Kokkala by Ruxy Sylwyka, CCC, December 09, 2014
• JikChess 0.02 released by Graham Banks, CCC, October 22, 2015

External Links

• JikChess chess engine
• JikChess 0.02 64-bit in CCRL 40/40

References