TJchess
TJchess is an engine that plays normal chess, Fischer random, crazyhouse, loop chess, and bughouse. Playing strength for normal chess is around rating 2300-2400 on CCRL.
Features:
- plays standard chess
- opening book
- hash table
- pondering
- plays Chess960 / Fischer Random
- can offer draw by agreement and accept draw offers (WB only)
- plays crazyhouse variant (WB only)
- plays loop chess (similar to crazyhouse) variant (WB only)
- plays bughouse variant (WB only, currently only in private versions, playing at ICC and FICS)
- resigns automatically (WB only)
- analysis mode (WB only)
TJchess Version History: (some minor changes are not listed)
6/20/2006: Version 0.49:
- Initial public version
12/31/2006: Version 0.78:
- fixed pondering bugs that caused losses on time
- added piece square tables
- opening book support for crazyhouse
- improved hash table usage
- move sorting improvements, killer moves
- IID (internal iterative deepening)
11/11/2007: Version 0.96:
- extension on single reply
- nullmove now works correctly
- SEE (static exchange evaluation)
- hash table size is configurable
07/21/2008: Version 0.121:
- added pawn hash table
- evaluation now accounts for bishop pair
- added some limited endgame knowledge
- time management changes
- move sorting improvements
- report score for self in thinking output, instead of score for white
- added UCI version
04/08/2011: Version 1.0:
- WinBoard protocol changes:
- - support WinBoard “memory” command
- - added some options to WinBoard engine menu
- - improved draw claim handling
- - support “level” command during game
- UCI version can now ponder under polyglot
- time management improved
- mobility term added to evaluation
- crazyhouse evaluation improved
- improved crazyhouse opening book is available
- added chess960 / FRC support (crazyhouse960 is also possible)
- implemented late move reductions
- .ini file handling changed. new engine is no longer compatible with old TJchess.ini files.
04/25/2011: Version 1.01:
- fixed a couple chess960 / FRC bugs (mostly affecting UCI chess960 mode)
02/12/2012: Version 1.1:
- fixed hash table usage bug
- added aspiration windows
- time management should be improved for conventional time control
- added support for loop chess variant (similar to crazyhouse)
- crazyhouse/loop chess only: further improved late move reductions
- code is now cross platform and can be compiled for Windows/Linux/Android
- started using profile guided optimization (pgo)
- added 64-bit versions (only a small speed gain over 32-bit)
- WinBoard protocol change: support “st” command
- UCI protocol changes:
- - support “movetime” command
- - support “depth” command
- - improved compliance to UCI spec (e.g. whitespace handling, case insensitivity)
09/08/2016: Version 1.3:
- misc. improvements, mostly for crazyhouse variant