v22.1 [Aug 6, 2020]
- Remove potential passer scoring.
- Tighten validation of hash/killer moves.
- Fix Resign threshold option (CECP mode).
- Simplify lmp threshold computation. No longer different for PV.
- Modify formula for lmp count. Do not allow 0 as depth index.
- Increase razor margin and reduce razoring depth.
- Fixes to singular search code. Verify hash move before doing a singular search.
- If singular extension is triggered, do not compute any additional extension, or reduction.
- Implement bench command. Use bench command for PGO.
- Update test tools to use pentanomial model for SPRT.
- MultiPV bug fixes, including a fix for bad ponder move output in MultiPV mode.
- Fix accept draw logic (CECP mode).
- Do not update history on fail high of 1st quiet and low depth (idea from Ethereal).
- Fix possible crash: when iterating through the search threads,ensure any that have.
- a null "work" pointer are skipped.
- Allow ProbCut while in check, and restrict recursive Probcut.
- Optimization in seeSign() function.
- Misc. code cleanup.
v18.0.0.1 [Aug 2, 2015]
May include unspecified updates, enhancements, or bug fixes.
v13.3.0.1 [Nov 18, 2011]
Changes in Arasan 13.3:
1) In Winboard mode, Arasan still accepts but does not rely on the
deprected "white" and "black" commands to keep track of the
computer's side of the game.
2) Winboard "level" command accepts time of form mm:ss and allows decimal
times.
3) More general code for trapped bishop.
4) Static null pruning is implemented.
5) Dynamic null reduction based on score (aka "smooth scaling").
6) Changes to razor & futility margins and related code.
7) Fixes to history pruning. History table is global now, not per-thread.
