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Remove and replace DoubledIsolated penalty by Doubled 

The values for both penalties were very close, so DoubledIsolated can be removed and replaced by Doubled.

Passed STC (simplification): https://tests.stockfishchess.org/tests/view/5ec7c18e2a585b485af54407
LLR: 2.97 (-2.94,2.94) {-1.50,0.50}
Total: 105360 W: 20175 L: 20136 D: 65049
Ptnml(0-2): 1803, 12230, 24572, 12275, 1800

Passed LTC:
LLR: 2.94 (-2.94,2.94) {-1.50,0.50}
Total: 15440 W: 1978 L: 1877 D: 11585
Ptnml(0-2): 92, 1405, 4667, 1422, 134

closes https://github.com/official-stockfish/Stockfish/pull/2696

Bench: 4668875
pull/2698/head
ElbertoOne 2020-05-23 13:14:02 +02:00 committed by Joost VandeVondele
parent 86575bcdd8
commit 81c58855e4
1 changed files with 7 additions and 8 deletions
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15
src/pawns.cpp
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@ -32,13 +32,12 @@ namespace {
#define S(mg, eg) make_score(mg, eg)
// Pawn penalties
constexpr Score Backward = S( 9, 24);
constexpr Score BlockedStorm = S(82, 82);
constexpr Score Doubled = S(11, 56);
constexpr Score DoubledIsolated = S(15, 57);
constexpr Score Isolated = S( 5, 15);
constexpr Score WeakLever = S( 0, 56);
constexpr Score WeakUnopposed = S(13, 27);
constexpr Score Backward = S( 9, 24);
constexpr Score BlockedStorm = S(82, 82);
constexpr Score Doubled = S(11, 56);
constexpr Score Isolated = S( 5, 15);
constexpr Score WeakLever = S( 0, 56);
constexpr Score WeakUnopposed = S(13, 27);
// Connected pawn bonus
constexpr int Connected[RANK_NB] = { 0, 7, 8, 12, 29, 48, 86 };
@ -151,7 +150,7 @@ namespace {
if ( (ourPawns & forward_file_bb(Them, s))
&& popcount(opposed) == 1
&& !(theirPawns & adjacent_files_bb(s)))
score -= DoubledIsolated;
score -= Doubled;
}
else if (backward)