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Add eg component to evaluate_shelter() #2137

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Add an endgame component to the blockedstorm penalty
so that the penalty applies more uniformly through the game.

STC 10+0.1 th 1 :
LLR: -2.95 (-2.94,2.94) [0.50,4.50]
Total: 94063 W: 21426 L: 21118 D: 51519
http://tests.stockfishchess.org/tests/view/5cd4605c0ebc5925cf04bf43

LTC 60+0.6 th 1 :
LLR: 2.95 (-2.94,2.94) [0.00,3.50]
Total: 188232 W: 32808 L: 32090 D: 123334
http://tests.stockfishchess.org/tests/view/5cd47d0a0ebc5925cf04c4fd

Refactored code with higher constant values gave a more convincing LTC result:
LLR: 2.96 (-2.94,2.94) [0.00,3.50]
Total: 30050 W: 5330 L: 5066 D: 19654
http://tests.stockfishchess.org/tests/view/5cd6a0000ebc5925cf050653

Bench: 3687700
This commit is contained in:
xoto10 2019-05-12 22:20:51 +01:00 • committed by Marco Costalba
parent 893a08a8c2
commit 5f4d44fda0
2 changed files with 17 additions and 11 deletions
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26
src/pawns.cpp
View file

@ -172,7 +172,7 @@ Entry* probe(const Position& pos) {
/// penalty for a king, looking at the king file and the two closest files.
template<Color Us>
Value Entry::evaluate_shelter(const Position& pos, Square ksq) {
void Entry::evaluate_shelter(const Position& pos, Square ksq, Score& shelter) {
constexpr Color Them = (Us == WHITE ? BLACK : WHITE);
constexpr Direction Down = (Us == WHITE ? SOUTH : NORTH);
@ -183,7 +183,8 @@ Value Entry::evaluate_shelter(const Position& pos, Square ksq) {
Bitboard ourPawns = b & pos.pieces(Us);
Bitboard theirPawns = b & pos.pieces(Them);
Value safety = (shift<Down>(theirPawns) & BlockSquares & ksq) ? Value(374) : Value(5);
Value bonus[] = { (shift<Down>(theirPawns) & BlockSquares & ksq) ? Value(374) : Value(5),
VALUE_ZERO };
File center = clamp(file_of(ksq), FILE_B, FILE_G);
for (File f = File(center - 1); f <= File(center + 1); ++f)
@ -195,12 +196,16 @@ Value Entry::evaluate_shelter(const Position& pos, Square ksq) {
Rank theirRank = b ? relative_rank(Us, frontmost_sq(Them, b)) : RANK_1;
int d = std::min(f, ~f);
safety += ShelterStrength[d][ourRank];
safety -= (ourRank && (ourRank == theirRank - 1)) ? 66 * (theirRank == RANK_3)
: UnblockedStorm[d][theirRank];
bonus[MG] += ShelterStrength[d][ourRank];
if (ourRank && (ourRank == theirRank - 1))
bonus[MG] -= 82 * (theirRank == RANK_3), bonus[EG] -= 82 * (theirRank == RANK_3);
else
bonus[MG] -= UnblockedStorm[d][theirRank];
}
return safety;
if (bonus[MG] > mg_value(shelter))
shelter = make_score(bonus[MG], bonus[EG]);
}
@ -223,16 +228,17 @@ Score Entry::do_king_safety(const Position& pos) {
else while (pawns)
minPawnDist = std::min(minPawnDist, distance(ksq, pop_lsb(&pawns)));
Value bonus = evaluate_shelter<Us>(pos, ksq);
Score shelter = make_score(-VALUE_INFINITE, VALUE_ZERO);
evaluate_shelter<Us>(pos, ksq, shelter);
// If we can castle use the bonus after the castling if it is bigger
if (pos.can_castle(Us | KING_SIDE))
bonus = std::max(bonus, evaluate_shelter<Us>(pos, relative_square(Us, SQ_G1)));
evaluate_shelter<Us>(pos, relative_square(Us, SQ_G1), shelter);
if (pos.can_castle(Us | QUEEN_SIDE))
bonus = std::max(bonus, evaluate_shelter<Us>(pos, relative_square(Us, SQ_C1)));
evaluate_shelter<Us>(pos, relative_square(Us, SQ_C1), shelter);
return make_score(bonus, -16 * minPawnDist);
return shelter - make_score(VALUE_ZERO, 16 * minPawnDist);
}
// Explicit template instantiation

2
src/pawns.h
View file

@ -50,7 +50,7 @@ struct Entry {
Score do_king_safety(const Position& pos);
template<Color Us>
Value evaluate_shelter(const Position& pos, Square ksq);
void evaluate_shelter(const Position& pos, Square ksq, Score& shelter);
Key key;
Score scores[COLOR_NB];