Chess engine: Myrddin 0.90 (winboard)

Myrddin - winboard chess engines
Author - John Merlino Rating CEDR=2629

v.0.90:

-- Fixed two bugs in SEE (stopped the calculation if the first capture was of equal value, and failed to include Kings in the calculation)

-- Fixed a bug that could cause a save to the hash table even if there was no best move

-- Tuned PST files for the first time, and re-tuned all other eval terms

-- Captures with negative SEE value can now be reduced

-- IID is now more aggressive in its depth reduction and can be applied in PV nodes

-- LMR reduction is now one depth less for PV nodes

-- No longer limiting the number of extensions for a single branch

-- Reduced the number of aspiration windows before performing a full-width search from six to two

-- Fixed a rare bug such that if a tt probe or IID returned an underpromotion it would not be moved to the front of the movelist

-- Fixed an issue when receiving the "force" command while pondering, which can happen with some GUIs

-- Modified the compiler options for magicmoves to improve perft results by 5%.

-- Various minor optimizations

-- Added "see" command to return the SEE value of a capture on the current position - example usage "see d4 e5"

-- Added "rpt" command to run a brief perft test (perft uses bulk counting)

-- Removed "-64" from version string as there is no longer a 32-bit version

Myrddin 0.90 download

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