const Score RookOpenFile = make_score(43, 21);
const Score RookSemiopenFile = make_score(19, 10);
const Score BishopPawns = make_score( 8, 12);
+ const Score MinorBehindPawn = make_score(16, 0);
const Score UndefendedMinor = make_score(25, 10);
const Score TrappedRook = make_score(90, 0);
if (!(pos.pieces(Them, PAWN) & pawn_attack_span(Us, s)))
score += evaluate_outposts<Piece, Us>(pos, ei, s);
- // Pawn in front of knight/bishop
+ // Bishop or knight behind a pawn
if ( relative_rank(Us, s) < RANK_5
&& (pos.pieces(PAWN) & (s + pawn_push(Us))))
- score += make_score(16, 0);
+ score += MinorBehindPawn;
}
if ( (Piece == ROOK || Piece == QUEEN)
if (pos.is_empty(blockSq))
{
squaresToQueen = forward_bb(Us, s);
- defendedSquares = squaresToQueen & ei.attackedBy[Us][ALL_PIECES];
// If there is an enemy rook or queen attacking the pawn from behind,
// add all X-ray attacks by the rook or queen. Otherwise consider only
else
unsafeSquares = squaresToQueen & (ei.attackedBy[Them][ALL_PIECES] | pos.pieces(Them));
+ if ( unlikely(forward_bb(Them, s) & pos.pieces(Us, ROOK, QUEEN))
+ && (forward_bb(Them, s) & pos.pieces(Us, ROOK, QUEEN) & pos.attacks_from<ROOK>(s)))
+ defendedSquares = squaresToQueen;
+ else
+ defendedSquares = squaresToQueen & ei.attackedBy[Us][ALL_PIECES];
+
// If there aren't enemy attacks huge bonus, a bit smaller if at
// least block square is not attacked, otherwise smallest bonus.
int k = !unsafeSquares ? 15 : !(unsafeSquares & blockSq) ? 9 : 3;
assert(eg_value(v) > -VALUE_INFINITE && eg_value(v) < VALUE_INFINITE);
assert(ph >= PHASE_ENDGAME && ph <= PHASE_MIDGAME);
- int ev = (eg_value(v) * int(sf)) / SCALE_FACTOR_NORMAL;
- int result = (mg_value(v) * int(ph) + ev * int(128 - ph)) / 128;
- return Value((result / GrainSize) * GrainSize); // Sign independent
+ int e = (eg_value(v) * int(sf)) / SCALE_FACTOR_NORMAL;
+ int r = (mg_value(v) * int(ph) + e * int(PHASE_MIDGAME - ph)) / PHASE_MIDGAME;
+ return Value((r / GrainSize) * GrainSize); // Sign independent
}
// apply_weight() weights score v by score w trying to prevent overflow