Garbochess-JS

• Start an online Garbochess-JS session on http://omerkel.github.io/Garbochess-JS/oliver
• Android APK available for install https://github.com/OMerkel/Garbochess-JS/releases/tag/release_6.0.1
  • requires minimum Android 4.4.2 (API-19)
• runs in various browsers on
  • desktop systems like BSDs, Linux, Win, MacOS and
  • mobile platforms like Android, FirefoxOS, iOS.

Keywords Chess, Schach, Ajedrez, Computer Chess, ECMA script, Web workers, CC0: Scalable Vector Graphics (SVG) chess set, Safari Apple-mobile-web-app support

Thanks

• Stockfish authors
• Crafty authors

Version 1.0

• Rewrote move generation for a big speed-up
• Pure material evaluation
• Null-move + Razoring + LMR in main search
• Hash table

Version 2.0

• Mobility evaluation (thanks Fruit)
• Bishop pair
• Rep-draw detection
• Better null-move pruning (thanks Stockfish)
• Better LMR (and again, thanks Stockfish)
• Bugfix with using hash move
• Some speed optimizations

Version 3.0

• 604.5/1000 or ~70 ELO better than previous version
• Killer moves
• Tuned PSQ tables/mobility
• Better king eval in endgame (won't stay on back row)
• Show '#' for checkmate
• Improved UI (new game, switch black/white, choose time/move)
• Fixed crashes from using invalid hash moves
• Other small bug fixes
• Speed optimizations

Version 4.0

• 594.5/1000 %:59.45 or 66 Elo better than previous
• SEE added (QSearch pruning, losing captures in main search)
• No nullmove in pawn endgames
• Fixed hashtable bugs (RNG was bad)
• Fixed starting position when playing black
• Added ability to analyze position for browsers that support it
• Added support for pasting FEN positions

Version 5.0

• Added checks in first ply of q-search (+15)

Version 5.1

• Bugfix to hashtable storing (no elo change, but big help in endgames)

Version 6.0

• Bonuses for knight attacking pieces (+20)
• Bonus for bishop pins (+40)

TODO

• Only extend checks with SEE > 0?
• Single reply to check should be marked as dangerous.