Chess engine UCI: Zahak 4.0 (Windows, Linux and Mac)

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Zahak - UCI chess engine written in Go. 
Author: Amanj Sherwany  Rating JCER=2943 (180 place)

v.4.0
King Safety, and Pawn Shield
Pawn structure evaluation is redone, with various mis-evaluation fixes
More aggressive Null Move Pruning
NPS increase and performance optimizations (almost 40% more NPS)
Add Internal Iterative Deepening
Add Enhanced Futility Pruning
Pseudo Legal Moves
Fix SEE pruning
Fix Hash-move and move ordering for pawn promotion
Search Parameter tweaking



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