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Tuesday, December 12, 2017

Stockfish 17121115 - new version!

Stockfish, chess engine UCI

Rating JCER = 3389
🔬 Author: Alain SAVARD

Timestamp: 1513002464 

Simplify other checks #1334 

Simplify the other check penalty computation. Compared to current master, 

a) it uses a 143 kingDanger penalty instead of S(10, 10) for the "otherCheck" (credits to ElbertoOne for finding a suitable kingDanger range to replace the score and to Guardian for showing this could also be a neutral change at LTC). 
This makes our king safety model more consistent and simpler. 

b) it might also score more than one "otherCheck" penalty for a given piece type instead of just one 

c) it might score many pinned penalties instead of just one. 

d) It also remove 3 conditionals and uses simpler expressions. 
So it was tested as a SPRT[-3, 1] 

Passed STC 
LLR: 2.96 (-2.94,2.94) [-3.00,1.00] 
Total: 11705 W: 2217 L: 2080 D: 7408 

And LTC 
LLR: 2.94 (-2.94,2.94) [-3.00,1.00] 
Total: 26812 W: 3575 L: 3463 D: 19774 

Trying to improve on b) another attempt was made to score also the "otherchecks" for piece types which had some safe checks, but this failed STC 

bench: 5149133 

⭐⭐⭐   Stockfish 17121115 - download

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