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Reintroduce rook contact checks

Browse source 
Were removed when merged from Glaurung 2.2, but without
any test.

Note that weight has been increased from original 2 to 4 and
has been also fixed a bug where in the original version were
considered also diagonal sqaures for the rook, that are
contact squares but not checks.

After 4449 games at 30"+0.1
Mod - Orig:  717 - 649 - 3083  ELO +5 (+- 4.1)

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba 2010-09-12 11:39:38 +01:00
parent 4350d9e8a6
commit dd8a076128
1 changed files with 19 additions and 0 deletions
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19
src/evaluate.cpp
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@ -200,6 +200,7 @@ namespace {
// Bonuses for enemy's safe checks
const int QueenContactCheckBonus = 6;
const int RookContactCheckBonus = 4;
const int QueenCheckBonus = 3;
const int RookCheckBonus = 2;
const int BishopCheckBonus = 1;
@ -710,6 +711,24 @@ namespace {
* (Them == pos.side_to_move() ? 2 : 1);
}
// Analyse enemy's safe rook contact checks. First find undefended
// squares around the king attacked by enemy rooks...
b = undefended & ei.attackedBy[Them][ROOK] & ~pos.pieces_of_color(Them);
// Consider only squares where the enemy rook gives check
b &= RookPseudoAttacks[ksq];
if (b)
{
// ...then remove squares not supported by another enemy piece
b &= ( ei.attackedBy[Them][PAWN] | ei.attackedBy[Them][KNIGHT]
| ei.attackedBy[Them][BISHOP] | ei.attackedBy[Them][QUEEN]);
if (b)
attackUnits += RookContactCheckBonus
* count_1s_max_15<HasPopCnt>(b)
* (Them == pos.side_to_move() ? 2 : 1);
}
// Analyse enemy's safe distance checks for sliders and knights
safe = ~(pos.pieces_of_color(Them) | ei.attackedBy[Us][0]);