Best chess engine: Stockfish 16102706_vande2. New version!

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Stockfish - chess engines UCI

Previous version chess engine Stockfish 

Author compilation - Joost VandeVondele       

Information on the compilation:
Timestamp: 1477543481 

Fix a series of undefined behaviours 

Avoid shifting negative signed integers and use typed 
enum to avoids decrementing a variable beyond its defined 
range, like: 
for (Rank r = RANK_8; r >= RANK_1; --r) 

Changes were tested individually and passed SPRT[-3, 1]. 

With this patch gcc --sanitize builds cleanly. 

No functional change. 



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