X-Git-Url: https://git.sesse.net/?p=stockfish;a=blobdiff_plain;f=src%2Fbitbase.cpp;h=ece9ec72b23968605cc535c1beb22203650e9762;hp=ed6ed2088e19b3c0bd5e19278645ea151ba0b1be;hb=f3b296c2e2061951d366edfbd5287f336e865553;hpb=6f1013794cecc179e7432004b8555e64ddca75a5

diff --git a/src/bitbase.cpp b/src/bitbase.cpp
index ed6ed208..ece9ec72 100644
--- a/src/bitbase.cpp
+++ b/src/bitbase.cpp
@@ -1,8 +1,6 @@
 /*
   Stockfish, a UCI chess playing engine derived from Glaurung 2.1
-  Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
-  Copyright (C) 2008-2015 Marco Costalba, Joona Kiiski, Tord Romstad
-  Copyright (C) 2015-2020 Marco Costalba, Joona Kiiski, Gary Linscott, Tord Romstad
+  Copyright (C) 2004-2021 The Stockfish developers (see AUTHORS file)
 
   Stockfish is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
@@ -19,13 +17,14 @@
 */
 
 #include <cassert>
-#include <numeric>
 #include <vector>
 #include <bitset>
 
 #include "bitboard.h"
 #include "types.h"
 
+namespace Stockfish {
+
 namespace {
 
   // There are 24 possible pawn squares: files A to D and ranks from 2 to 7.
@@ -69,7 +68,6 @@ namespace {
 
 } // namespace
 
-
 bool Bitbases::probe(Square wksq, Square wpsq, Square bksq, Color stm) {
 
   assert(file_of(wpsq) <= FILE_D);
@@ -99,7 +97,6 @@ void Bitbases::init() {
           KPKBitbase.set(idx);
 }
 
-
 namespace {
 
   KPKPosition::KPKPosition(unsigned idx) {
@@ -109,25 +106,25 @@ 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
@@ -150,7 +147,7 @@ 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)]
@@ -171,3 +168,5 @@ namespace {
   }
 
 } // namespace
+
+} // namespace Stockfish