Mobility is zero for a pinned piece

[stockfish] / src / search.cpp

diff --git a/src/search.cpp b/src/search.cpp
index 15ebbad0653e6add1f5fa9e4fa99df4ae92ee963..b00c270bbd94bd034dcfe96fcd2bd6d979c0ccbc 100644 (file)
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -267,7 +267,7 @@ namespace {
   bool connected_moves(const Position &pos, Move m1, Move m2);
   bool value_is_mate(Value value);
   bool move_is_killer(Move m, const SearchStack& ss);
-  Depth extension(const Position &pos, Move m, bool pvNode, bool check, bool singleReply, bool mateThreat, bool* dangerous);
+  Depth extension(const Position &pos, Move m, bool pvNode, bool capture, bool check, bool singleReply, bool mateThreat, bool* dangerous);
   bool ok_to_do_nullmove(const Position &pos);
   bool ok_to_prune(const Position &pos, Move m, Move threat, Depth d);
   bool ok_to_use_TT(const TTEntry* tte, Depth depth, Value beta, int ply);
@@ -449,7 +449,6 @@ void think(const Position &pos, bool infinite, bool ponder, int side_to_move,
   // Set thinking time:
   int myTime = time[side_to_move];
   int myIncrement = increment[side_to_move];
-  int oppTime = time[1 - side_to_move];
 
   if (!movesToGo) // Sudden death time control
   {
@@ -806,7 +805,7 @@ namespace {
 
         // Decide search depth for this move
         bool dangerous;
-        ext = extension(pos, move, true, pos.move_is_check(move), false, false, &dangerous);
+        ext = extension(pos, move, true, pos.move_is_capture(move), pos.move_is_check(move), false, false, &dangerous);
         newDepth = (Iteration - 2) * OnePly + ext + InitialDepth;
 
         // Make the move, and search it
@@ -1010,7 +1009,7 @@ namespace {
 
       // Decide the new search depth
       bool dangerous;
-      Depth ext = extension(pos, move, true, moveIsCheck, singleReply, mateThreat, &dangerous);
+      Depth ext = extension(pos, move, true, moveIsCapture, moveIsCheck, singleReply, mateThreat, &dangerous);
       Depth newDepth = depth - OnePly + ext;
 
       // Make and search the move
@@ -1242,7 +1241,7 @@ namespace {
     else if (   !value_is_mate(beta)
              && approximateEval < beta - RazorMargin
              && depth < RazorDepth
-             && (RazorAtDepthOne || depth >= 2*OnePly)
+             && (RazorAtDepthOne || depth > OnePly)
              && ttMove == MOVE_NONE
              && !pos.has_pawn_on_7th(pos.side_to_move()))
     {
@@ -1306,7 +1305,7 @@ namespace {
 
       // Decide the new search depth
       bool dangerous;
-      Depth ext = extension(pos, move, false, moveIsCheck, singleReply, mateThreat, &dangerous);
+      Depth ext = extension(pos, move, false, moveIsCapture, moveIsCheck, singleReply, mateThreat, &dangerous);
       Depth newDepth = depth - OnePly + ext;
 
       // Futility pruning
@@ -1596,7 +1595,7 @@ namespace {
 
       // Decide the new search depth.
       bool dangerous;
-      Depth ext = extension(pos, move, false, moveIsCheck, false, false, &dangerous);
+      Depth ext = extension(pos, move, false, moveIsCapture, moveIsCheck, false, false, &dangerous);
       Depth newDepth = sp->depth - OnePly + ext;
 
       // Prune?
@@ -1714,7 +1713,7 @@ namespace {
 
       // Decide the new search depth.
       bool dangerous;
-      Depth ext = extension(pos, move, true, moveIsCheck, false, false, &dangerous);
+      Depth ext = extension(pos, move, true, moveIsCapture, moveIsCheck, false, false, &dangerous);
       Depth newDepth = sp->depth - OnePly + ext;
 
       // Make and search the move.
@@ -2179,7 +2178,7 @@ namespace {
   // extended, as example because the corresponding UCI option is set to zero,
   // the move is marked as 'dangerous' so, at least, we avoid to prune it.
 
-  Depth extension(const Position &pos, Move m, bool pvNode, bool check,
+  Depth extension(const Position& pos, Move m, bool pvNode, bool capture, bool check,
                   bool singleReply, bool mateThreat, bool* dangerous) {
 
     assert(m != MOVE_NONE);
@@ -2196,18 +2195,21 @@ namespace {
     if (mateThreat)
         result += MateThreatExtension[pvNode];
 
-    if (pos.move_is_pawn_push_to_7th(m))
+    if (pos.type_of_piece_on(move_from(m)) == PAWN)
     {
-        result += PawnPushTo7thExtension[pvNode];
-        *dangerous = true;
-    }
-    if (pos.move_is_passed_pawn_push(m))
-    {
-        result += PassedPawnExtension[pvNode];
-        *dangerous = true;
+        if (pos.move_is_pawn_push_to_7th(m))
+        {
+            result += PawnPushTo7thExtension[pvNode];
+            *dangerous = true;
+        }
+        if (pos.move_is_passed_pawn_push(m))
+        {
+            result += PassedPawnExtension[pvNode];
+            *dangerous = true;
+        }
     }
 
-    if (   pos.move_is_capture(m)
+    if (   capture
         && pos.type_of_piece_on(move_to(m)) != PAWN
         && (  pos.non_pawn_material(WHITE) + pos.non_pawn_material(BLACK)
             - pos.midgame_value_of_piece_on(move_to(m)) == Value(0))
@@ -2219,7 +2221,7 @@ namespace {
     }
 
     if (   pvNode
-        && pos.move_is_capture(m)
+        && capture
         && pos.type_of_piece_on(move_to(m)) != PAWN
         && pos.see(m) >= 0)
     {