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Chess engine: Stockfish 19111617

on
Stockfish - UCI chess engine
Interesting compiled by Vizvezdenec

 Introduce king flank defenders 

 This patch implements what we have been trying for quite some time - dependance of kingdanger on balance of attackers and defenders of king flank, to avoid overestimate attacking power if the opponent has enough 
defenders of king position. We already have some form of it in bishop and knight defenders - this is further work in this direction. 

 What to do based on this? 
1) constant 4 is arbitrary, maybe it is not optimal 
2) maybe we can use quadratic formula as in kingflankattack 
3) simplification into alrealy existing terms is always a possibility :) 
4) overall kingdanger tuning always can be done. 

 passed STC: 
LLR: 2.96 (-2.94,2.94) [-1.50,4.50] 
Total: 26298 W: 5819 L: 5632 D: 14847 Elo +2.47

 passed LTC: 
LLR: 2.96 (-2.94,2.94) [0.00,3.50] 
Total: 30600 W: 5042 L: 4784 D: 20774 Elo +2.93


Rating JCER=3257

 Stockfish 19111617 - download


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