KnightX 1.91 released

[Anonymous]

Hello,

Knightx v1.91 winboard engine is released.
I removed a problematic section of evaluation code relative to the pieces distance to kings.
I did a small change in search depth extensions.
I have generated a new and larger opening book, imported from the file Fritz4.fbk.

v1.91 vs 1.90a (same book) : 5W 1L 4D

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