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King safety: retire rook contact check

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Merged from Glaurung 2.2

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba
2008-12-22 12:07:00 +01:00
parent 3fafc9768a
commit 54b7da120f
2 changed files with 5 additions and 25 deletions
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27
src/evaluate.cpp
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@@ -64,8 +64,8 @@ namespace {
const int WeightPawnStructureEndgameInternal = 0x100;
const int WeightPassedPawnsMidgameInternal = 0x100;
const int WeightPassedPawnsEndgameInternal = 0x100;
const int WeightKingSafetyInternal = 0x100;
const int WeightKingOppSafetyInternal = 0x100;
const int WeightKingSafetyInternal = 0x110;
const int WeightKingOppSafetyInternal = 0x110;
const int WeightSpaceInternal = 0x30;
// Visually better to define tables constants
@@ -230,8 +230,7 @@ namespace {
const int KnightAttackWeight = 2;
// Bonuses for safe checks for each piece type.
int QueenContactCheckBonus = 4;
int RookContactCheckBonus = 2;
int QueenContactCheckBonus = 3;
int QueenCheckBonus = 2;
int RookCheckBonus = 1;
int BishopCheckBonus = 1;
@@ -820,25 +819,8 @@ namespace {
}
}
}
// Analyse safe rook contact checks:
if (RookContactCheckBonus)
{
b = undefended & ei.attacked_by(them, ROOK) & ~p.pieces_of_color(them);
if (b)
{
Bitboard attackedByOthers =
ei.attacked_by(them, PAWN) | ei.attacked_by(them, KNIGHT)
| ei.attacked_by(them, BISHOP) | ei.attacked_by(them, QUEEN);
b &= attackedByOthers;
if (b)
{
int count = count_1s_max_15(b);
attackUnits += (RookContactCheckBonus * count * (sente? 2 : 1));
}
}
}
// Analyse safe distance checks:
// Analyse safe distance checks
if (QueenCheckBonus > 0 || RookCheckBonus > 0)
{
b = p.piece_attacks<ROOK>(s) & ~p.pieces_of_color(them) & ~ei.attacked_by(us);
@@ -1219,7 +1201,6 @@ namespace {
void init_safety() {
QueenContactCheckBonus = get_option_value_int("Queen Contact Check Bonus");
RookContactCheckBonus = get_option_value_int("Rook Contact Check Bonus");
QueenCheckBonus = get_option_value_int("Queen Check Bonus");
RookCheckBonus = get_option_value_int("Rook Check Bonus");
BishopCheckBonus = get_option_value_int("Bishop Check Bonus");