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.