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Chess engine: Topple 0.8.0

on
Topple - UCI chess engine. 
Author- Vincent Tang, Rating JCER=2919

v. 0.8.0:
General
Rewritten code for sliding move generation
Simplified CMake code for releases
Search
Worker threads are now pooled for Lazy SMP
Fixed singular extensions not correctly excluding moves in PV nodes.
Slightly updated move ordering
Evaluation
Removed kat_table_offset parameter
Added an additional tapering dimension to evaluation related to pawn structure
Vectorised evaluation using GCC's vector extensions
Added evaluation of overprotected pieces
Texel tuner now generates source code for evaluation parameters
Expected strength gain is ~20 elo based on self play testing. Use the modern build if it runs, otherwise try popcnt or legacy if that doesn't work either.

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