HCha/Stockfish
1
0
Fork 0
mirror of https://github.com/HChaZZY/Stockfish.git synced 2025-12-19 16:46:30 +08:00
Code Issues Packages Projects Releases Wiki Activity

Calculate min distance between king and his pawns

Browse Source 
Just added infrastructure.

No functional change.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba
2012-06-17 09:03:05 +01:00
parent 0446fc85de
commit 9793fa1906
4 changed files with 14 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

7
src/bitboard.cpp
View File

@@ -45,6 +45,7 @@ Bitboard ThisAndAdjacentFilesBB[8];
Bitboard InFrontBB[2][8];
Bitboard StepAttacksBB[16][64];
Bitboard BetweenBB[64][64];
Bitboard DistanceRingsBB[64][8];
Bitboard ForwardBB[2][64];
Bitboard PassedPawnMask[2][64];
Bitboard AttackSpanMask[2][64];
@@ -195,6 +196,12 @@ void Bitboards::init() {
for (Square s2 = SQ_A1; s2 <= SQ_H8; s2++)
SquareDistance[s1][s2] = std::max(file_distance(s1, s2), rank_distance(s1, s2));
for (Square s1 = SQ_A1; s1 <= SQ_H8; s1++)
for (int d = 1; d < 8; d++)
for (Square s2 = SQ_A1; s2 <= SQ_H8; s2++)
if (SquareDistance[s1][s2] == d)
DistanceRingsBB[s1][d - 1] |= s2;
for (int i = 0; i < 64; i++)
if (!Is64Bit) // Matt Taylor's folding trick for 32 bit systems
{