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 Latest abrok Development Versions September 16th (SF The gift that keeps on giving )

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PostSubject: Latest abrok Development Versions September 16th (SF The gift that keeps on giving )   Latest abrok Development Versions    September 16th   (SF The gift that keeps on giving ) EmptyMon Sep 16, 2019 8:29 pm

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: Stéphane Nicolet
Date: Mon Sep 16 01:37:39 2019 +0200
Timestamp: 1568590659

Scale down endgame factor when shuffling

This patch decreases the endgame scale factor using the 50 moves counter.
Looking at some games with this patch, it seems to have two effects on
the playing style:

1) when no progress can be made in late endgames (for instance in fortresses
or opposite bishops endgames) the evaluation will be largely tamed down
towards a draw value.

2) more interestingly, there is also a small effect in the midgame play because
Stockfish will panic a little bit if there are more than four consecutive
shuffling moves with an advantage: the engine will try to move a pawn or to
exchange a piece to keep the advantage, so the follow-ups of the position
will be discovered earlier by the alpha-beta search.

passed STC:
LLR: 2.95 (-2.94,2.94) [0.50,4.50]
Total: 23017 W: 5080 L: 4805 D: 13132 Elo +4.15
http://tests.stockfishchess.org/tests/view/5d7e4aef0ebc59069c36fc74

passed LTC:
LLR: 2.95 (-2.94,2.94) [0.00,3.50]
Total: 30746 W: 5171 L: 4911 D: 20664 Elo +2.94
http://tests.stockfishchess.org/tests/view/5d7e513d0ebc59069c36ff26

Pull request: https://github.com/official-stockfish/Stockfish/pull/2304

Bench: 4272173

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