ChessV

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ChessV Universal Chess Program ¹

ChessV,
an open source engine that plays over 50 chess variants with various board sizes as well as orthodox chess, written by Gregory Strong in C++, released under the GPL v2, first published in 2004 ¹. ChessV 0.95 was released in November 2016 ². ChessV runs under Windows with 32-bit and 64-bit executables available and can run on Linux under Wine. It features an own GUI, but includes also an executable named ChessV_Winboard.exe which allows running ChessV under WinBoard. ChessV 2.0, released in March 2017, completely rewritten from scratch ³ in C#, is a .NET Framework application, and can run on non-Windows operating systems, such as Linux, using Mono.

Features

Board Representation

ChessV encapsulates the board, position and game related data inside a huge C++ class, with number of files, ranks and squares as member, and specifies a bitboard type accordant to its size, either with 64, 96 or 128 bits. Sliding pieces attacks are generated using rotated bitboards.

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• Iterative Deepening
• Negamax Alpha-Beta PVS
• Transposition Table
• Repetition Hash Table
• Selectivity
  • Extensions
    • Check Extensions
    • Threat Extensions
  • Pruning
    • Futility Pruning
    • Null Move Pruning (NMP)
  • Reductions
    • Late Move Reductions (LMR)
    • Razoring
• Move Ordering
  • Internal Iterative Deepening
  • Killer Heuristic
  • Static Exchange Evaluation

Evaluation

• Evaluation Hash Table
• Lazy Evaluation
• Piece-Square Tables
• Pawn Hash Table
• Pawn Structure
• Mobility
• King Safety
• King Tropism

Variants

⁴

• Alapo
• Almost Chess
• Angels and Devils
• Archchess
• Berolina Chess
• Bird’s Chess
• Cagliostro’s Chess
• Capablanca Chess
• Capablanca Chess, Aberg variant
• Capablanca Chess, Paulowich variant
• Carrera’s Chess
• Chess256
• Chess 480
• Chess and a Half
• Chess with Augmented Knights
• Chess with Different Armies
• Chess with Ultima Pieces
• Compound Courier Custom Chess
• Courier Chess
• Cylindrical Chess
• Diagonal Chess
• Diamond Chess
• Embassy Chess
• Emperor’s Game
• Enep
• Eurasian Chess
• Exinction Chess
• Fischer Random Chess
• Great Chess
• Great Shatranj
• Grand Chess
• Grotesque Chess
• Hannibal Chess
• Janus Chess
• Janus Kamil Chess
• Kinglet
• Ladorean Chess
• Latrunculi duo milia et septum
• Legan’s Game
• Lemurian Shatranj
• Lions and Unicorns Chess
• Los Alamos Chess
• Modern Kamil
• Modern Shatranj
• Odin’s Rune Chess
• Opti Chess (mirror I)
• Opulent Chess
• Orthodox Chess
• Polymorph Chess
• Roman Chess
• Royal Court
• Schoolbook Chess
• Shatranj
• Shatranj Kamil
• Shatranj Kamil (64)
• Sosarian Chess
• Switching Chess
• TenCubed Chess
• Three Checks Chess
• Ultima
• Unicorn Chess
• Unicorn Great Chess
• Unicorn Grand Chess
• Univers Chess

See also

• Fairy-Max
• Sjaak
• Sjeng
• SMIRF

Forum Posts

• Interesting multi-variant chess thingy called chessv by Dann Corbit, CCC, November 16, 2004
• Sources of ChessV? by Harm Geert Muller, CCC, December 13, 2007
• Anything new about the ChessV Project? by Reinhard Scharnagl, CCC, July 20, 2008
• ChessV... by Alexander Schmidt, September 29, 2009
• ChessV 0.95 Released by Greg Strong, chessvariants.com, November 13, 2016
• Re: One of The best Weeks in Chess Engine History? by Harm Geert Muller, CCC, November 14, 2016
• ChessV 2.0 - open source GUI and engine for chess variants by Gregory Strong, CCC, March 19, 2017
• ChessV 2.1 Released by Gregory Strong, CCC, January 20, 2018

External Links

Chess Engine

• ChessV Universal Chess Program
• ChessV from Wikipedia
• ChessV Universal Chess Program - Chessvariants
• Sam Trenholme's webpage - ChessV

Misc

• Kazumi Watanabe featuring Tochika All Stars - Unicorn, Tokyo Jazz 2010, YouTube Video

Tochika All Stars are Warren Bernhardt, Omar Hakim, Mike Mainieri, and Marcus Miller

Watch on YouTube

References