TomitankChess

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tomitankChess,
an open source chess engine by Tamás Kuzmics written in JavaScript, licensed under the GPL v3.0. tomitankChess was first released as version 1.4 in September 2017 ¹. The js source code was initially obfuscated ^{2 3}, but published as human readable source a few days later ⁴. tomitankChess uses the Node.js JavaScript runtime ⁵ to implement UCI. tomitankChess is available as mobile app Chess or Sakk under iOS and Android, the Pro versions at a not too cheap price ⁶.

Features

⁷

Board Representation

• Bitboards (tomitankChess 2.0)
• Blockers and Beyond
• Piece-Lists

Search

• Iterative Deepening
• Fail-Soft Principal Variation Search
• Transposition Table
• Internal Iterative Deepening
• Late Move Reductions
• Late Move Pruning
• Razoring
• Futility Pruning
• Null Move Pruning
• Static Null Move Pruning (Reverse Futility Pruning)
• Quiescence Search

Delta Pruning

SEE Pruning

Evaluation

• Neural Networks (5.0)
• Tapered Eval
• Material
• Bishop Pair
• Piece-Square Tables
• Mobility
  • Trapped Pieces
  • Rooks on (Semi) Open Files
  • Rook on Seventh
• Outposts
• Pawn Structure
  • Pawn Hash Table
  • Backward Pawn
  • Connected Pawns
  • Doubled Pawn
  • Isolated Pawn
  • Passed Pawn
  • Unstoppable Passer
• King Safety
  • Attacking King Zone
  • Pawn Shelter
• Tempo
• Automated Tuning by Logistic Regression

Forum Posts

2017 ...

• JavaScript Pawn Bitboard (with 32 bit integers) by Tamás Kuzmics, CCC, September 17, 2017
• tomitankChess - New JavaScript engine by Tamás Kuzmics, CCC, September 17, 2017
• Strongest JavaScript Chess Engine by Tamás Kuzmics, CCC, September 30, 2017
• tomitankChess v.1.5 by Tamás Kuzmics, CCC, December 03, 2017
• tomitankChess 2.0 by Tamás Kuzmics, CCC, July 11, 2018
• tomitankChess 2.1 by Tamás Kuzmics, CCC, November 26, 2018
• tomitankChess 3.0 by Tamás Kuzmics, CCC, January 14, 2019

2020 ...

• tomitankChess 4.0 by Tamás Kuzmics, CCC, January 24, 2020
• Mobile application by Tamás Kuzmics, CCC, March 15, 2020
• tomitankChess 4.2 by Tamás Kuzmics, CCC, September 23, 2020
• tomitankChess 5.0 with NN by Tamás Kuzmics, CCC, January 18, 2021

External Links

• GitHub - tomitank/tomitankChess: Hungarian JavaScript Chess Engine
• Chess - Apps on Google Play
• Chess Pro - Apps on Google Play
• Sakk on the App Store
• Sakk Pro on the App Store
• tomitankChess in CCRL 40/15

References