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Toppled Klein Bottle ¹

Topple, (ToppleChess)
an UCI compliant open source chess engine by Vincent Tang, written in C++, first released in June 2018 under the MIT License ¹.

Features

²

Board Representation

• Bitboard Board-Definition
• 8x8 Board
• Fancy Magic Bitboards by Pradyumna Kannan

Search

• Lazy SMP using Threads ³
• Iterative Deepening
• Aspiration Windows
• Principal Variation Search
• Transposition Table
  • Shared Hash Table
  • Four Buckets
  • Zobrist Hashing
• Selectivity
  • Extensions
    • Check Extensions
    • PV Extensions
    • Restricted Singular Extensions
  • Pruning/Reductions
    • Late Move Reductions
    • Futility Pruning
    • Delta Pruning
    • History Leaf Pruning
    • Mate Distance Pruning
    • Null Move Pruning
    • Static Exchange Evaluation Pruning
  • Quiescence Search
• Move Ordering
  • Staged Move Generation
  • Hash Move
  • Internal Iterative Deepening
  • Static Exchange Evaluation
  • Killer Heuristic
  • History Heuristic

Evaluation

• Tapered Eval
• Material
• Mobility
• Piece-Square Tables
• Pawn Structure
• Pawn Hash Table
• King Safety

Misc

• Syzygy Bases
• Texel's Tuning Method

Forum Posts

2018 ...

• Topple by Vincent Tang, CCC, June 09, 2018
• Topple v0.2.1 Release by Vincent Tang, CCC, July 16, 2018
• Automated tuning... finally... (Topple v0.3.0) by Vincent Tang, CCC, January 08, 2019
• Topple v0.3.4 released by Vincent Tang, CCC, January 26, 2019
• Topple 0.3.5 by Vincent Tang, CCC, February 03, 2019
• Topple 0.5.0 by Vincent Tang, CCC, April 02, 2019
• Re: New engine releases 2019 by Günther Simon, CCC, December 28, 2019

2020 ...

• Re: New engine releases 2020 by Günther Simon, CCC, February 21, 2020

External Links

Chess Engine

• GitHub - konsolas/ToppleChess: UCI chess engine
• Topple in CCRL 40/15

Misc

• topple - Wiktionary
• Topple (game) from Wikipedia
• Topple Tower from Wikipedia

References