Gnuchess5 5.0.175b (13-Apr-2013)
http://hardy.uhasselt.be/Toga/gnuchess-release/The .zip file contains the source as well as binaries for linux32/64, windows32/64 and android.
* SwapOffSign implemented and used almost everywhere instead of
SwapOff (GNU Chess parlance for SEE).
* Optimized futility pruning (do pruning without doing the move) both
in main search and quiescence search (big elo gain).
* --sig and --version print full name.
* Only extend checks on non-negative SEE.
* SEE pruning (Lucas Braesch). Nice elo gain.
* CLOP tuning of king center control in endgame.
* CLOP tuning of aspiration search margins.
* History ageing (another nice elo gain).
* Null threat extension (Lucas Braesch).
* Evaluation cache implemented (size still needs to be tuned).
* Very rudimentary implementation of KRKP.
* Rudimentary implementation of KRKRP.
* CLOP tuning of futility margins.
* CLOP tuning of passed pawn eval.
* Free passer bonus (nice elo gain).
* Reduced delta margin.