- Strength Increase
- About 50 Elo stronger than Version 1.4 at long time controls (60' + 0.05')
- Better Time Management
- Changed how much time was allocated for repeating time controls.
- Should no longer have twice as much time as most opponents during the endgame
- Better move ordering
- So called "bad captures" are now ordered after killer moves
- A bad capture is defined by a capture that captures a less valuable piece that is defended by a pawn.
- Changed move ordering at root
- Now previous best moves are kept closer to the front of the move list
- Will no longer "throw out" a fail high at root when out of time
- Evaluation Tweaks
- Increased the speed at which doubled pawns are detected
- Slightly optimized king safety values
- Optimized pawn chain values
- Pawn chains were previously highly overvalued
- More Pruning
- Improved both futility and razoring values
- Added more pruning in Qsearch for non-discocheck moves
- More null move pruning
- The better the current position the pruning will occur
- Bad captures are now able to be futility pruned
- More aggressive aspiration search window
- Bug Fixes
- Fixed a bug with pawnstorms
- Previously the least advanced pawn on a file was considered to be the storming pawn
Download Link:
http://www.mediafire.com/download/652c6i6tl7l1lu8/Nirvanachess_1.5.rar
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