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
constexpr Score KnightOnQueen = S( 16, 12);
constexpr Score LongDiagonalBishop = S( 45, 0);
constexpr Score MinorBehindPawn = S( 18, 3);
constexpr Score KnightOnQueen = S( 16, 12);
constexpr Score LongDiagonalBishop = S( 45, 0);
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 RestrictedPiece = S( 7, 7);
constexpr Score RookOnPawn = S( 10, 32);
constexpr Score PawnlessFlank = S( 17, 95);
constexpr Score RestrictedPiece = S( 7, 7);
constexpr Score RookOnPawn = S( 10, 32);
if (Pt == BISHOP || Pt == KNIGHT)
{
// Bonus if piece is on an outpost square or can reach one
if (Pt == BISHOP || Pt == KNIGHT)
{
// 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);
- score += Outpost * (Pt == KNIGHT ? 4 : 2)
- * ((attackedBy[Us][PAWN] & s) ? 2 : 1);
+ score += Outpost * (Pt == KNIGHT ? 2 : 1);
- else if (bb &= b & ~pos.pieces(Us))
- score += Outpost * (Pt == KNIGHT ? 2 : 1)
- * ((attackedBy[Us][PAWN] & bb) ? 2 : 1);
+ else if (bb & b & ~pos.pieces(Us))
+ score += Outpost / (Pt == KNIGHT ? 1 : 2);
// Knight and Bishop bonus for being right behind a pawn
if (shift<Down>(pos.pieces(PAWN)) & s)
// Knight and Bishop bonus for being right behind a pawn
if (shift<Down>(pos.pieces(PAWN)) & s)