Improve previous patch

[stockfish] / src / move.cpp

diff --git a/src/move.cpp b/src/move.cpp
index 62ec7579659817cc6233700f0a44ea9c41f9b3f6..74271b31428346238877a968029a488f759f8797 100644 (file)
--- a/src/move.cpp
+++ b/src/move.cpp
@@ -17,7 +17,6 @@
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
-#include <algorithm>
 #include <cassert>
 #include <string>
 
@@ -57,10 +56,10 @@ const string move_to_uci(Move m, bool chess960) {
 /// simple coordinate notation and returns an equivalent Move if any.
 /// Moves are guaranteed to be legal.
 
-Move move_from_uci(const Position& pos, string str) {
+Move move_from_uci(const Position& pos, string& str) {
 
-  // Some GUIs, like Junior, could send promotion in uppercase
-  std::transform(str.begin(), str.end(), str.begin(), tolower);
+  if (str.length() == 5) // Junior could send promotion in uppercase
+      str[4] = char(tolower(str[4]));
 
   for (MoveList<MV_LEGAL> ml(pos); !ml.end(); ++ml)
       if (str == move_to_uci(ml.move(), pos.is_chess960()))