X-Git-Url: https://git.sesse.net/?p=stockfish;a=blobdiff_plain;f=src%2Fbitboard.cpp;h=08b43ad8a5b111406af4a0cf3b8ea21e14f630b0;hp=8be7cea4b6ae6b098dfa2537904d0885ed2daa8f;hb=dc7fd868f4fa41251a9521a0b25e3adb483bfd83;hpb=0446fc85dec483d1887adc22a3d729b0cacd8328

diff --git a/src/bitboard.cpp b/src/bitboard.cpp
index 8be7cea4..08b43ad8 100644
--- a/src/bitboard.cpp
+++ b/src/bitboard.cpp
@@ -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];
@@ -142,7 +143,7 @@ void Bitboards::print(Bitboard b) {
       std::cout << "+---+---+---+---+---+---+---+---+" << '\n';
 
       for (File file = FILE_A; file <= FILE_H; file++)
-          std::cout << "| " << (b & make_square(file, rank) ? "X " : "  ");
+          std::cout << "| " << (b & (file | rank) ? "X " : "  ");
 
       std::cout << "|\n";
   }
@@ -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
       {