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Rename kingZone[] and reverse the king's color 

Seems easier to understand to me. From Critter.

No functional change.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
sf_2.3.1_base
Marco Costalba 2011-10-01 10:47:43 +01:00
parent a90a990118
commit 2225e3bbe7
1 changed files with 8 additions and 8 deletions
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16
src/evaluate.cpp
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@ -44,20 +44,20 @@ namespace {
// all squares attacked by the given color.
Bitboard attackedBy[2][8];
// kingZone[color] is the zone around the enemy king which is considered
// kingRing[color] is the zone around the king which is considered
// by the king safety evaluation. This consists of the squares directly
// adjacent to the king, and the three (or two, for a king on an edge file)
// squares two ranks in front of the king. For instance, if black's king
// is on g8, kingZone[WHITE] is a bitboard containing the squares f8, h8,
// is on g8, kingRing[BLACK] is a bitboard containing the squares f8, h8,
// f7, g7, h7, f6, g6 and h6.
Bitboard kingZone[2];
Bitboard kingRing[2];
// kingAttackersCount[color] is the number of pieces of the given color
// which attack a square in the kingZone of the enemy king.
// which attack a square in the kingRing of the enemy king.
int kingAttackersCount[2];
// kingAttackersWeight[color] is the sum of the "weight" of the pieces of the
// given color which attack a square in the kingZone of the enemy king. The
// given color which attack a square in the kingRing of the enemy king. The
// weights of the individual piece types are given by the variables
// QueenAttackWeight, RookAttackWeight, BishopAttackWeight and
// KnightAttackWeight in evaluate.cpp
@ -436,12 +436,12 @@ namespace {
if ( pos.piece_count(Us, QUEEN)
&& pos.non_pawn_material(Us) >= QueenValueMidgame + RookValueMidgame)
{
ei.kingZone[Us] = (b | (Us == WHITE ? b >> 8 : b << 8));
ei.kingRing[Them] = (b | (Us == WHITE ? b >> 8 : b << 8));
b &= ei.attackedBy[Us][PAWN];
ei.kingAttackersCount[Us] = b ? count_1s<Max15>(b) / 2 : 0;
ei.kingAdjacentZoneAttacksCount[Us] = ei.kingAttackersWeight[Us] = 0;
} else
ei.kingZone[Us] = ei.kingAttackersCount[Us] = 0;
ei.kingRing[Them] = ei.kingAttackersCount[Us] = 0;
}
@ -505,7 +505,7 @@ namespace {
ei.attackedBy[Us][Piece] |= b;
// King attacks
if (b & ei.kingZone[Us])
if (b & ei.kingRing[Them])
{
ei.kingAttackersCount[Us]++;
ei.kingAttackersWeight[Us] += KingAttackWeights[Piece];