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Simplify Outposts #2176

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This is a functional simplification. This is NOT the exact version that was tested. Beyond the testing, an assignment was removed and a piece changes for consistency.

Instead of rewarding ANY square past an opponent pawn as an "outpost," only use squares that are protected by our pawn. I believe this is more consistent with what the chess world calls an "outpost."

STC
LLR: 2.95 (-2.94,2.94) [-3.00,1.00]
Total: 23540 W: 5387 L: 5269 D: 12884
http://tests.stockfishchess.org/tests/view/5cf51e6d0ebc5925cf08b823

LTC
LLR: 2.94 (-2.94,2.94) [-3.00,1.00]
Total: 53085 W: 9271 L: 9204 D: 34610
http://tests.stockfishchess.org/tests/view/5cf5279e0ebc5925cf08b992

bench 3424592
This commit is contained in:
protonspring 2019-06-03 07:16:33 -06:00 • committed by Marco Costalba
parent 434b2c72a4
commit 09caea5cab
1 changed files with 5 additions and 7 deletions
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12
src/evaluate.cpp
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@ -141,7 +141,7 @@ namespace {
constexpr Score KnightOnQueen = S( 16, 12); constexpr Score KnightOnQueen = S( 16, 12);
constexpr Score LongDiagonalBishop = S( 45, 0); constexpr Score LongDiagonalBishop = S( 45, 0);
constexpr Score MinorBehindPawn = S( 18, 3); constexpr Score MinorBehindPawn = S( 18, 3);
constexpr Score Outpost = S( 9, 3); constexpr Score Outpost = S( 36, 12);
constexpr Score PawnlessFlank = S( 17, 95); constexpr Score PawnlessFlank = S( 17, 95);
constexpr Score RestrictedPiece = S( 7, 7); constexpr Score RestrictedPiece = S( 7, 7);
constexpr Score RookOnPawn = S( 10, 32); constexpr Score RookOnPawn = S( 10, 32);
@ -305,14 +305,12 @@ namespace {
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
bb = OutpostRanks & ~pe->pawn_attacks_span(Them); bb = OutpostRanks & attackedBy[Us][PAWN] & ~pe->pawn_attacks_span(Them);
if (bb & s) if (bb & s)
score += Outpost * (Pt == KNIGHT ? 4 : 2) score += Outpost * (Pt == KNIGHT ? 2 : 1);
* ((attackedBy[Us][PAWN] & s) ? 2 : 1);
else if (bb &= b & ~pos.pieces(Us)) else if (bb & b & ~pos.pieces(Us))
score += Outpost * (Pt == KNIGHT ? 2 : 1) score += Outpost / (Pt == KNIGHT ? 1 : 2);
* ((attackedBy[Us][PAWN] & bb) ? 2 : 1);
// Knight and Bishop bonus for being right behind a pawn // Knight and Bishop bonus for being right behind a pawn
if (shift<Down>(pos.pieces(PAWN)) & s) if (shift<Down>(pos.pieces(PAWN)) & s)