TJchess

TJchess is an engine that plays normal chess, crazyhouse, and bughouse. Playing strength for normal chess is still relatively weak for a computer chess engine, but challenging for most humans. I hope to improve strength in future versions.

TJchess started out as a WinBoard engine, but now there is also a separate UCI version for people who use a UCI interface.  It wasn’t much extra work to add UCI, since TJshogi uses USI.

Features:

• plays standard chess
• opening book
• hash table
• pondering
• can offer draw by agreement and accept draw offers (WB only)
• plays 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:

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)
• other minor changes and bug fixes

11/11/2007:  Version 0.96:

• extension on single reply
• nullmove now works correctly
• SEE (static exchange evaluation)
• hash table size is configurable
• other minor changes and bug fixes

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
• other minor changes and bug fixes