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Raise penalty blocked enemy pawn on 6th rank

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Idea from Lyudmil Tsvetkov.

The value seems to be raised a bit abruptly, but as
Gary said, a blocked pawn on the sixth rank has been
instrumental in limiting king mobility in multiple
losses that I've seen from SF. A blocked pawn on fifth
rank is much less serious on the king safety impact.

Passed both STC
LLR: 2.97 (-2.94,2.94) [-1.50,4.50]
Total: 14551 W: 2750 L: 2607 D: 9194

and LTC
LLR: 2.96 (-2.94,2.94) [0.00,6.00]
Total: 43595 W: 6917 L: 6618 D: 30060

And even a retest at 60" fixed games 40K
ELO: 1.79 +-1.9 (95%) LOS: 97.0%
Total: 39889 W: 6018 L: 5813 D: 28058

bench: 7154916
This commit is contained in:
Stefan Geschwentner 2014-04-05 12:27:57 +02:00 • committed by Marco Costalba
parent eced15fe36
commit 0e8ad40ef0
1 changed files with 1 additions and 1 deletions
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2
src/pawns.cpp
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@ -72,7 +72,7 @@ namespace {
const Value StormDanger[3][RANK_NB] = {
{ V( 0), V(64), V(128), V(51), V(26) },
{ V(26), V(32), V( 96), V(38), V(20) },
{ V( 0), V( 0), V( 64), V(25), V(13) } };
{ V( 0), V( 0), V(160), V(25), V(13) } };
// Max bonus for king safety. Corresponds to start position with all the pawns
// in front of the king and no enemy pawn on the horizon.