diff --git a/src/misc.h b/src/misc.h
index d6bc2672..58646aaf 100644
--- a/src/misc.h
+++ b/src/misc.h
@@ -38,7 +38,7 @@ extern void dbg_mean_of(int v);
extern void dbg_print();
class Position;
-extern Move move_from_uci(const Position& pos, const std::string& str);
+extern Move move_from_uci(const Position& pos, std::string str);
extern const std::string move_to_uci(Move m, bool chess960);
extern const std::string move_to_san(Position& pos, Move m);
diff --git a/src/move.cpp b/src/move.cpp
index 7e171f7a..62ec7579 100644
--- a/src/move.cpp
+++ b/src/move.cpp
@@ -17,6 +17,7 @@
along with this program. If not, see .
*/
+#include
#include
#include
@@ -56,7 +57,10 @@ 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, const 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);
for (MoveList ml(pos); !ml.end(); ++ml)
if (str == move_to_uci(ml.move(), pos.is_chess960()))