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Saturday, October 15, 2016

Strong chess engine: Stockfish 16100806. New version!

Stockfish - chess engines UCI

Previous version chess engine Stockfish 

Author compilation - 
 atumanian  

Information on the compilation:
Timestamp: 1475901516 

Optimisation of Position::see and Position::see_sign 

Stephane's patch removes the only usage of Position::see, where the 
returned value isn't immediately compared with a value. So I replaced 
this function by its optimised and more specific version see_ge. This 
function also supersedes the function Position::see_sign. 

bool Position::see_ge(Move m, Value v) const; 

This function tests if the SEE of a move is greater or equal than a 
given value. We use forward iteration on captures instread of backward 
one, therefore we don't need the swapList array. Also we stop as soon 
as we have enough information to obtain the result, avoiding unnecessary 
calls to the min_attacker function. 

Speed tests (Windows 7), 20 runs for each engine: 
Test engine: mean 866648, st. dev. 5964 
Base engine: mean 846751, st. dev. 22846 
Speedup: 1.023 

Speed test by Stephane Nicolet 

Fishtest STC test: 
LLR: 2.96 (-2.94,2.94) [0.00,5.00] 
Total: 26040 W: 4675 L: 4442 D: 16923 
No functional change. 




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