1 files changed, 19 insertions, 0 deletions
diff --git a/src/uci.cpp b/src/uci.cpp
index a2c3672..42be55d 100644
--- a/src/uci.cpp
+++ b/src/uci.cpp
@@ -5,6 +5,7 @@
 #include "moves.hpp"
 
 #include <algorithm>
+#include <cassert>
 #include <cctype>
 #include <cstdint>
 #include <cstdlib>
@@ -99,6 +100,24 @@ void Uci() {
       cout << "bestmove ";
       cout << (char)(best.From.file + 'a') << 8 - best.From.rank
            << (char)(best.To.file + 'a') << 8 - best.To.rank;
+      if (best.promotion != NONE) {
+        switch (best.promotion) {
+        case QUEEN:
+          cout << "q";
+          break;
+        case ROOK:
+          cout << "r";
+          break;
+        case KNIGHT:
+          cout << "n";
+          break;
+        case BISHOP:
+          cout << "b";
+          break;
+        default:
+          assert(false && "Unexepted promotion type");
+        }
+      }
       println();
 
       cout.flush();