Tuesday, March 4, 2014

Nirvanachess 1.5 Release

What is new in this release?

  • 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

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