Defenchess 2.2

This release increases the playing strength of Defenchess significantly. Below are every change introduced in this version.

Changes:

• Revised time management for X/Y and X+0 (moves per time and zero increment) time controls
• Opposite colored bishops endgame knowledge
• Slight improvements in how time is counted and PVs are printed while failing high/low (now at least one move will always be printed even when failing)
• Improved thread management (fixed a bug where not providing a position after setting the number of threads would crash the engine)
• Improved draw (and lack thereof) detection
• Fixed an issue where TB scores would never be returned
• Fixed a bug in calculating pinned piece mobility
• Allowed pinned pieces to capture pieces of equal or higher value in mobility calculation
• Implemented followup history
• Fixed a bug that prevented extensions from being applied in the first moves searched in PV nodes
• Introduced king threats against pieces and pieces flanking the king in evaluation
• Introduced the use of history in late move reductions
• Tweaked endgame scores for the side with higher material but no pawns

Defenchess 2.1

Major tuning overhaul and a TB bug fix.

Changes:

• Significant ELO gains were obtained by using the training set created by the author of Zurichess which can be found at http://www.zurichess.xyz/blog/texels-tuning-method/
• Fixed an obscure TB bug where Defenchess would play an illegal move when playing as black with a black pawn on the B2 square.
• The quit command should quit without crashing the engine now.
• Added a no popcount binary for Windows.

Please let me know if you notice any issues. Thanks!

Defenchess 2.0

Defenchess 2.0 release. Windows and Linux binaries are included.