X-Git-Url: https://git.sesse.net/?p=stockfish;a=blobdiff_plain;f=src%2Fbitbase.cpp;h=7e27eb96a10c3855dc067dd945cb0825e8748e79;hp=bef2dc49e2f1a91816dbacfd55ebcf975d312276;hb=5e91c5dcc8066e9f346a10010ddce70f2d317ef6;hpb=0c878adb36c1013944231083d6a7b3b53aa1ad7e

diff --git a/src/bitbase.cpp b/src/bitbase.cpp
index bef2dc49..7e27eb96 100644
--- a/src/bitbase.cpp
+++ b/src/bitbase.cpp
@@ -108,25 +108,25 @@ namespace {
     stm        = Color ((idx >> 12) & 0x01);
     psq        = make_square(File((idx >> 13) & 0x3), Rank(RANK_7 - ((idx >> 15) & 0x7)));
 
-    // Check if two pieces are on the same square or if a king can be captured
+    // Invalid if two pieces are on the same square or if a king can be captured
     if (   distance(ksq[WHITE], ksq[BLACK]) <= 1
         || ksq[WHITE] == psq
         || ksq[BLACK] == psq
-        || (stm == WHITE && (PawnAttacks[WHITE][psq] & ksq[BLACK])))
+        || (stm == WHITE && (pawn_attacks_bb(WHITE, psq) & ksq[BLACK])))
         result = INVALID;
 
-    // Immediate win if a pawn can be promoted without getting captured
+    // Win if the pawn can be promoted without getting captured
     else if (   stm == WHITE
              && rank_of(psq) == RANK_7
-             && ksq[stm] != psq + NORTH
-             && (    distance(ksq[~stm], psq + NORTH) > 1
-                 || (PseudoAttacks[KING][ksq[stm]] & (psq + NORTH))))
+             && ksq[WHITE] != psq + NORTH
+             && (    distance(ksq[BLACK], psq + NORTH) > 1
+                 || (distance(ksq[WHITE], psq + NORTH) == 1)))
         result = WIN;
 
-    // Immediate draw if it is a stalemate or a king captures undefended pawn
+    // Draw if it is stalemate or the black king can capture the pawn
     else if (   stm == BLACK
-             && (  !(PseudoAttacks[KING][ksq[stm]] & ~(PseudoAttacks[KING][ksq[~stm]] | PawnAttacks[~stm][psq]))
-                 || (PseudoAttacks[KING][ksq[stm]] & psq & ~PseudoAttacks[KING][ksq[~stm]])))
+             && (  !(attacks_bb<KING>(ksq[BLACK]) & ~(attacks_bb<KING>(ksq[WHITE]) | pawn_attacks_bb(WHITE, psq)))
+                 || (attacks_bb<KING>(ksq[BLACK]) & ~attacks_bb<KING>(ksq[WHITE]) & psq)))
         result = DRAW;
 
     // Position will be classified later
@@ -149,7 +149,7 @@ namespace {
     const Result Bad  = (stm == WHITE ? DRAW  : WIN);
 
     Result r = INVALID;
-    Bitboard b = PseudoAttacks[KING][ksq[stm]];
+    Bitboard b = attacks_bb<KING>(ksq[stm]);
 
     while (b)
         r |= stm == WHITE ? db[index(BLACK, ksq[BLACK] , pop_lsb(&b), psq)]