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Simplification: remove pawn shelter/storm masks

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Encode the pawn shelter/storm masks into the danger score

This highly specialized rule directly contradicts the VERY high
danger score for blocked pawns. Reducing the danger score for
blocked pawns and removing this rule is apparently an effective
compromise.

STC
LLR: 2.96 (-2.94,2.94) [-3.00,1.00]
Total: 36597 W: 7522 L: 7429 D: 21646
http://tests.stockfishchess.org/tests/view/5ab935f30ebc5902932cc016

LTC
LLR: 2.95 (-2.94,2.94) [-3.00,1.00]
Total: 100690 W: 15373 L: 15372 D: 69945
http://tests.stockfishchess.org/tests/view/5ab9501f0ebc5902932cc042

Closes https://github.com/official-stockfish/Stockfish/pull/1514

Bench: 5980822
This commit is contained in:
protonspring 2018-03-27 17:29:56 +02:00 • committed by Stéphane Nicolet
parent 367304e930
commit 29070bd01a
1 changed files with 4 additions and 13 deletions
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17
src/pawns.cpp
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@ -68,10 +68,10 @@ namespace {
{ V( 1), V( 64), V( 143), V(26), V(13) },
{ V( 1), V( 47), V( 110), V(44), V(24) },
{ V( 0), V( 72), V( 127), V(50), V(31) } },
{ { V( 0), V( 0), V( 79), V(23), V( 1) }, // BlockedByPawn
{ V( 0), V( 0), V( 148), V(27), V( 2) },
{ V( 0), V( 0), V( 161), V(16), V( 1) },
{ V( 0), V( 0), V( 171), V(22), V(15) } },
{ { V( 0), V( 0), V( 19), V(23), V( 1) }, // BlockedByPawn
{ V( 0), V( 0), V( 88), V(27), V( 2) },
{ V( 0), V( 0), V( 101), V(16), V( 1) },
{ V( 0), V( 0), V( 111), V(22), V(15) } },
{ { V(22), V( 45), V( 104), V(62), V( 6) }, // Unblocked
{ V(31), V( 30), V( 99), V(39), V(19) },
{ V(23), V( 29), V( 96), V(41), V(15) },
@ -237,12 +237,6 @@ template<Color Us>
Value Entry::shelter_storm(const Position& pos, Square ksq) {
constexpr Color Them = (Us == WHITE ? BLACK : WHITE);
constexpr Bitboard ShelterMask =
Us == WHITE ? make_bitboard(SQ_A2, SQ_B3, SQ_C2, SQ_F2, SQ_G3, SQ_H2)
: make_bitboard(SQ_A7, SQ_B6, SQ_C7, SQ_F7, SQ_G6, SQ_H7);
constexpr Bitboard StormMask =
Us == WHITE ? make_bitboard(SQ_A3, SQ_C3, SQ_F3, SQ_H3)
: make_bitboard(SQ_A6, SQ_C6, SQ_F6, SQ_H6);
enum { BlockedByKing, Unopposed, BlockedByPawn, Unblocked };
@ -271,9 +265,6 @@ Value Entry::shelter_storm(const Position& pos, Square ksq) {
[d][rkThem];
}
if (popcount((ourPawns & ShelterMask) | (theirPawns & StormMask)) == 5)
safety += Value(300);
return safety;
}