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Author: xoto10
Date: Wed Jul 31 09:35:20 2019 +0200
Timestamp: 1564558520

Tune search constants

This is the result of a 200k tuning run at LTC:
http://tests.stockfishchess.org/tests/view/5d3576b70ebc5925cf0e9e1e

which passed quickly at LTC:
LLR: 2.95 (-2.94,2.94) [0.50,4.50]
Total: 12954 W: 2280 L: 2074 D: 8600 Elo +5.53
http://tests.stockfishchess.org/tests/view/5d3ff3f70ebc5925cf0f87a2

STC failed, but second LTC at [0,4] passed easily:
LLR: 2.96 (-2.94,2.94) [0.00,4.00]
Total: 8004 W: 1432 L: 1252 D: 5320 Elo +7.81
http://tests.stockfishchess.org/tests/view/5d407cff0ebc5925cf0f9119

Further work?
No doubt some of these changes produce most of the gain and some are neutral
or even bad, so further testing on individual/groups of parameters changed
here might show more gains. It does look like these tests might need to be
at LTC though, so maybe not too practical to do. See the thread in the pull
request for an interesting discussion:
https://github.com/official-stockfish/Stockfish/pull/2260

Bench: 4024328

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