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Bonus for rook behind a passed 

If our rook is behind a passed pawn, all
squares are defended.

One of the longest tests to pass !

Passed both short TC
LLR: 2.97 (-2.94,2.94)
Total: 44560 W: 9518 L: 9281 D: 25761

And long TC
LLR: 2.96 (-2.94,2.94)
Total: 61348 W: 11618 L: 11192 D: 38538

bench: 3787694
sf_dd_base
homoSapiensSapiens 2013-08-22 17:19:58 +03:00 committed by Marco Costalba
parent a0cf424cfc
commit 4b9e338541
1 changed files with 6 additions and 1 deletions
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7
src/evaluate.cpp
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@ -826,7 +826,6 @@ Value do_evaluate(const Position& pos, Value& margin) {
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
@ -837,6 +836,12 @@ Value do_evaluate(const Position& pos, Value& margin) {
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;