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» Latest abok builds December 9 th
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 Latest aboke builds May 6th

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PostSubject: Latest aboke builds May 6th    Sun May 06, 2018 5:02 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: Sun May 6 09:44:14 2018 +0200
Timestamp: 1525592654

Simplify the backward pawns code

The two lines of code in the patch seem to be just as good as master.

1. We now only look at the current square to see if it is currently backward,
whereas master looks there AND further ahead in the current file (master would
declare a pawn "backward" even though it could still safely advance a little).
This simplification allows us to avoid the use of the difficult logic with
`backmost_sq(Us, neighbours | stoppers)`.

2. The condition `relative_rank(Us,s) < RANK_5` is simplified away.

Passed STC:
LLR: 2.95 (-2.94,2.94) [-3.00,1.00]
Total: 68132 W: 14025 L: 13992 D: 40115
http://tests.stockfishchess.org/tests/view/5aedc97a0ebc5902a4099fd6

Passed LTC:
LLR: 2.95 (-2.94,2.94) [-3.00,1.00]
Total: 23789 W: 3643 L: 3527 D: 16619
http://tests.stockfishchess.org/tests/view/5aee4f970ebc5902a409a03a

Ideas for further work:

• The new code flags some pawns on the 5th rank as backward, which was not the
case in the old master. So maybe we should test a version with that included?

• Further tweaks of the backward condition with [0..5] bounds?

Closes https://github.com/official-stockfish/Stockfish/pull/1583

Bench: 5122789



http://abrok.eu/stockfish/
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