Remove the tropism term from kingDanger
author31m059 <37052095+31m059@users.noreply.github.com>
Sat, 24 Nov 2018 01:09:03 +0000 (02:09 +0100)
committerStéphane Nicolet <cassio@free.fr>
Sat, 24 Nov 2018 01:09:35 +0000 (02:09 +0100)
commit6e66e7aae28ab087ad816589c0d54851993f2e4a
tree3e92f0fd832da2c4d3336df8f12215395ef588b9
parent4b88bea4fcd5c4cb931610f97460615dd71ff35b
Remove the tropism term from kingDanger

A recent LTC tuning session by @candirufish showed this term decreasing significantly. It appears that it can be removed altogether without significant Elo loss.

I also thank @GuardianRM, whose attempt to remove tropism from king danger inspired this one.

After this PR is merged, my next step will be to attempt to tune the coefficients of this new, simplified kingDanger calculation.

STC:
LLR: 2.95 (-2.94,2.94) [-3.00,1.00]
Total: 12518 W: 2795 L: 2656 D: 7067
http://tests.stockfishchess.org/tests/view/5befadda0ebc595e0ae3a289

LTC:
LLR: 2.96 (-2.94,2.94) [-3.00,1.00]
Total: 164771 W: 26463 L: 26566 D: 111742
http://tests.stockfishchess.org/tests/view/5befcca70ebc595e0ae3a343

LTC 2, rebased on Stockfish 10 beta:
LLR: 2.96 (-2.94,2.94) [-3.00,1.00]
Total: 75226 W: 12563 L: 12529 D: 50134
http://tests.stockfishchess.org/tests/view/5bf2e8910ebc5902bcecb919

Bench: 3412071
src/evaluate.cpp