X-Git-Url: https://git.sesse.net/?p=stockfish;a=blobdiff_plain;f=src%2Fmovepick.cpp;h=d8ab68e76aab3719aee7e29749071b5edf7f1841;hp=3bc56751f94c3710ddc1051362fc1ac87a1f1c56;hb=8df1cd10df0869f05916d1eb19e33b66127fcb86;hpb=33d95482182e459eb033de47a31f142880aa9afb

diff --git a/src/movepick.cpp b/src/movepick.cpp
index 3bc56751..d8ab68e7 100644
--- a/src/movepick.cpp
+++ b/src/movepick.cpp
@@ -31,9 +31,6 @@ namespace {
     QSEARCH_TT, QCAPTURE_INIT, QCAPTURE, QCHECK_INIT, QCHECK
   };
 
-  // Helper filter used with select()
-  const auto Any = [](){ return true; };
-
   // partial_insertion_sort() sorts moves in descending order up to and including
   // a given limit. The order of moves smaller than the limit is left unspecified.
   void partial_insertion_sort(ExtMove* begin, ExtMove* end, int limit) {
@@ -67,7 +64,7 @@ MovePicker::MovePicker(const Position& p, Move ttm, Depth d, const ButterflyHist
   assert(d > DEPTH_ZERO);
 
   stage = pos.checkers() ? EVASION_TT : MAIN_TT;
-  ttMove = pos.pseudo_legal(ttm) ? ttm : MOVE_NONE;
+  ttMove = ttm && pos.pseudo_legal(ttm) ? ttm : MOVE_NONE;
   stage += (ttMove == MOVE_NONE);
 }
 
@@ -79,8 +76,9 @@ MovePicker::MovePicker(const Position& p, Move ttm, Depth d, const ButterflyHist
   assert(d <= DEPTH_ZERO);
 
   stage = pos.checkers() ? EVASION_TT : QSEARCH_TT;
-  ttMove =   pos.pseudo_legal(ttm)
-          && (depth > DEPTH_QS_RECAPTURES || to_sq(ttm) == recaptureSquare) ? ttm : MOVE_NONE;
+  ttMove =    ttm
+           && pos.pseudo_legal(ttm)
+           && (depth > DEPTH_QS_RECAPTURES || to_sq(ttm) == recaptureSquare) ? ttm : MOVE_NONE;
   stage += (ttMove == MOVE_NONE);
 }
 
@@ -92,7 +90,8 @@ MovePicker::MovePicker(const Position& p, Move ttm, Value th, const CapturePiece
   assert(!pos.checkers());
 
   stage = PROBCUT_TT;
-  ttMove =   pos.pseudo_legal(ttm)
+  ttMove =   ttm
+          && pos.pseudo_legal(ttm)
           && pos.capture(ttm)
           && pos.see_ge(ttm, threshold) ? ttm : MOVE_NONE;
   stage += (ttMove == MOVE_NONE);
@@ -192,7 +191,8 @@ top:
       /* fallthrough */
 
   case REFUTATION:
-      if (select<Next>([&](){ return   !pos.capture(move)
+      if (select<Next>([&](){ return    move != MOVE_NONE
+                                    && !pos.capture(move)
                                     &&  pos.pseudo_legal(move); }))
           return move;
       ++stage;
@@ -222,7 +222,7 @@ top:
       /* fallthrough */
 
   case BAD_CAPTURE:
-      return select<Next>(Any);
+      return select<Next>([](){ return true; });
 
   case EVASION_INIT:
       cur = moves;
@@ -233,7 +233,7 @@ top:
       /* fallthrough */
 
   case EVASION:
-      return select<Best>(Any);
+      return select<Best>([](){ return true; });
 
   case PROBCUT:
       return select<Best>([&](){ return pos.see_ge(move, threshold); });
@@ -258,7 +258,7 @@ top:
       /* fallthrough */
 
   case QCHECK:
-      return select<Next>(Any);
+      return select<Next>([](){ return true; });
   }
 
   assert(false);