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Simplify KingProtector penalty.

Browse source 
Recent tuning results implied this penalty is more important for knights
and bishops, and almost negligible for rooks and queen.

Passed as simplification both
STC
LLR: 2.95 (-2.94,2.94) [-3.00,1.00]
Total: 20873 W: 4592 L: 4469 D: 11812
http://tests.stockfishchess.org/tests/view/5b2fb4d00ebc5902b2e57e84

and LTC
LLR: 2.95 (-2.94,2.94) [-3.00,1.00]
Total: 46069 W: 7949 L: 7870 D: 30250
http://tests.stockfishchess.org/tests/view/5b2fcc4b0ebc5902b2e580c5

Closes https://github.com/official-stockfish/Stockfish/pull/1660

Bench: 5487679
This commit is contained in:
joergoster 2018-06-24 17:07:38 +02:00 • committed by Stéphane Nicolet
parent f0a7bed6fb
commit 1e9397a2df
1 changed files with 5 additions and 5 deletions
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10
src/evaluate.cpp
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@ -158,8 +158,8 @@ namespace {
// PassedDanger[Rank] contains a term to weight the passed score // PassedDanger[Rank] contains a term to weight the passed score
constexpr int PassedDanger[RANK_NB] = { 0, 0, 0, 2, 7, 12, 19 }; constexpr int PassedDanger[RANK_NB] = { 0, 0, 0, 2, 7, 12, 19 };
// KingProtector[PieceType-2] contains a penalty according to distance from king // KingProtector[knight/bishop] contains a penalty according to distance from king
constexpr Score KingProtector[] = { S(4, 6), S(6, 3), S(1, 0), S(0, -2) }; constexpr Score KingProtector[] = { S(4, 6), S(6, 3) };
// Assorted bonuses and penalties // Assorted bonuses and penalties
constexpr Score BishopPawns = S( 3, 5); constexpr Score BishopPawns = S( 3, 5);
@ -330,9 +330,6 @@ namespace {
mobility[Us] += MobilityBonus[Pt - 2][mob]; mobility[Us] += MobilityBonus[Pt - 2][mob];
// Penalty if the piece is far from the king
score -= KingProtector[Pt - 2] * distance(s, pos.square<KING>(Us));
if (Pt == BISHOP || Pt == KNIGHT) if (Pt == BISHOP || Pt == KNIGHT)
{ {
// Bonus if piece is on an outpost square or can reach one // Bonus if piece is on an outpost square or can reach one
@ -348,6 +345,9 @@ namespace {
&& (pos.pieces(PAWN) & (s + pawn_push(Us)))) && (pos.pieces(PAWN) & (s + pawn_push(Us))))
score += MinorBehindPawn; score += MinorBehindPawn;
// Penalty if the piece is far from the king
score -= KingProtector[Pt == BISHOP] * distance(s, pos.square<KING>(Us));
if (Pt == BISHOP) if (Pt == BISHOP)
{ {
// Penalty according to number of pawns on the same color square as the // Penalty according to number of pawns on the same color square as the