TEST: extend when few moves available

Signed-off-by: Marco Costalba <mcostalba@gmail.com>

diff --git a/src/search.cpp b/src/search.cpp
index c5d6e36bf153649cb788a3c2ea87b435a030029d..d19c9a9015423192991319e4e6b910db955c4e8e 100644 (file)
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -931,6 +931,7 @@ namespace {
     {
       assert(move_is_ok(move));
 
     {
       assert(move_is_ok(move));
 

+      bool fewMoves = (depth <= OnePly && mp.number_of_moves() < 4);

       bool singleReply = (pos.is_check() && mp.number_of_moves() == 1);
       bool moveIsCheck = pos.move_is_check(move, dcCandidates);
       bool moveIsCapture = pos.move_is_capture(move);
       bool singleReply = (pos.is_check() && mp.number_of_moves() == 1);
       bool moveIsCheck = pos.move_is_check(move, dcCandidates);
       bool moveIsCapture = pos.move_is_capture(move);


@@ -942,7 +943,7 @@ namespace {
         PawnValueMidgame : pos.midgame_value_of_piece_on(move_to(move));
 
       // Decide the new search depth
         PawnValueMidgame : pos.midgame_value_of_piece_on(move_to(move));
 
       // Decide the new search depth

-      Depth ext = extension(pos, move, true, moveIsCheck, singleReply, mateThreat);
+      Depth ext = extension(pos, move, true, moveIsCheck, singleReply || fewMoves, mateThreat);

       Depth newDepth = depth - OnePly + ext;
 
       // Make and search the move
       Depth newDepth = depth - OnePly + ext;
 
       // Make and search the move