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Give bonus for bishops that are alligned with enemy kingring. 

Inspired by the succesful patch "Give bonus for rooks that are alligned with enemy kingring" from Vizvezdenec,
this idea has been reused for bishops. Here, we only consider attacks that are not blocked by any pawn.
Also we have a 50% higher bonus than for the rooks.

STC:
LLR: 2.94 (-2.94,2.94) {-0.50,1.50}
Total: 68960 W: 13495 L: 13202 D: 42263
Ptnml(0-2): 1213, 8018, 15802, 8157, 1290
https://tests.stockfishchess.org/tests/view/5ed27495042fa6d77c3553aa

LTC:
LLR: 2.96 (-2.94,2.94) {0.25,1.75}
Total: 54560 W: 7105 L: 6780 D: 40675
Ptnml(0-2): 379, 4986, 16254, 5253, 408
https://tests.stockfishchess.org/tests/view/5ed30375596e6dc1e1f97425

closes https://github.com/official-stockfish/Stockfish/pull/2708

Bench: 4860021
pull/2720/head
Stefan Geschwentner 2020-05-31 17:00:47 +02:00 committed by Joost VandeVondele
parent 8c3d9d996a
commit d1ec10cd4f
1 changed files with 5 additions and 0 deletions
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5
src/evaluate.cpp
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@ -128,6 +128,7 @@ namespace {
// Assorted bonuses and penalties
constexpr Score BishopPawns = S( 3, 7);
constexpr Score BishopOnKingRing = S( 24, 0);
constexpr Score BishopXRayPawns = S( 4, 5);
constexpr Score CorneredBishop = S( 50, 50);
constexpr Score FlankAttacks = S( 8, 0);
@ -288,9 +289,13 @@ namespace {
kingAttackersWeight[Us] += KingAttackWeights[Pt];
kingAttacksCount[Us] += popcount(b & attackedBy[Them][KING]);
}
else if (Pt == ROOK && (file_bb(s) & kingRing[Them]))
score += RookOnKingRing;
else if (Pt == BISHOP && (attacks_bb<BISHOP>(s, pos.pieces(PAWN)) & kingRing[Them]))
score += BishopOnKingRing;
int mob = popcount(b & mobilityArea[Us]);
mobility[Us] += MobilityBonus[Pt - 2][mob];