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 Latest aboke builds Mar 10th

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Wendy D Green
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PostSubject: Latest aboke builds Mar 10th   Sun Mar 11, 2018 4:28 pm

!! latest version !!


Windows x64 for Haswell CPUs
Windows x64 for modern computers
Windows x64
Windows 32
Linux x64 for Haswell CPUs
Linux x64 for modern computers
Linux x64
Author: protonspring
Date: Sat Mar 10 12:04:03 2018 +0100
Timestamp: 1520679843

Implement an old Russian proverb

"Loose pieces drop, in blitz keep everything protected"

Adding a small S(2,2) bonus for knights, bishops, rooks, and
queens that are "connected" to each other (in the sense that
they are under attack by our own pieces) apparently is a good
thing. It probably helps the pieces work together a bit better.

STC
LLR: 2.96 (-2.94,2.94) [0.00,5.00]
Total: 12317 W: 2655 L: 2467 D: 7195
http://tests.stockfishchess.org/tests/view/5aa2d86b0ebc590297cb6474

LTC
LLR: 2.96 (-2.94,2.94) [0.00,5.00]
Total: 35725 W: 5516 L: 5263 D: 24946
http://tests.stockfishchess.org/tests/view/5aa2fc6f0ebc590297cb64a8

How to continue from there (by Stefan Geschwentner)?

• First we should identify all other eval terms which have an overlap
with new connectivity bonus (like the outpost bonus). A simple way
would be subtract the connectivity bonus from them and look if this
better, or use a SPSA session for these terms.

• Tuning Connectivity himself with SPSA seems not so promising because
of the small range which is useful. Here manual testing changes of
Connectivity like +-1 seems better.

• The eg value is more important because in endgame the position gets
more open and so attacks on pieces are easier. Another important point
is that when defending/fortress-like positions each defending piece
needs a protection, otherwise attacks on them can break defense.

Closes https://github.com/official-stockfish/Stockfish/pull/1474

Bench: 5318575
Windows x64 for Haswell CPUs
Windows x64 for modern computers
Windows x64
Windows 32
Linux x64 for Haswell CPUs
Linux x64 for modern computers
Linux x64
Author: Joost VandeVondele
Date: Sat Mar 10 11:06:53 2018 +0100
Timestamp: 1520676413

Assign improving only once

Avoid duplicated code after recent commit "Use evaluation trend
to adjust futility margin". We initialize the improving variable
to true in the check case, which allows to avoid redundant code
in the general case.

Tested for speed by snicolet, patch seems about 0.4% faster.

No functional change.

Note: initializing the improving variable to false in the check
case was tested as a functional change, ending yellow in both STC
and LTC. This change is not included in the commit, but it is an
interesting result that could become part of a future patch about
improving or LMR. Reference of the LTC yellow test:
http://tests.stockfishchess.org/tests/view/5aa131560ebc590297cb636e
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