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Very strong chess engine: Stockfish 16102106. New version!

Stockfish - chess engines UCI

Previous version chess engine Stockfish 

Author compilation - 
 syzygy      

Information on the compilation:
Timestamp: 1477023345 

Per-thread TB hit counters 

Use a per-thread counter to reduce contention 
with many cores and endgame positions. 

Measured around 1% speed-up on a 12 core and 8% 
on 28 cores with 6-men, searching on: 
7R/1p3k2/2p2P2/3nR1P1/8/3b1P2/7K/r7 b - - 3 38 

Also retire the unused set_nodes_searched() and fix 
a couple of return types and naming conventions. 

No functional change. 



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