promotion to queen

1 files changed, 7 insertions, 1 deletions

diff --git a/chess.c b/chess.c
index b6c6671..ecf46fe 100644
--- a/chess.c
+++ b/chess.c
@@ -6,7 +6,7 @@
 #include <keyboard.h>
 
 // Missing features
-// promotion
+// underpromotion
 // display checkmate and stalemate
 // arrows to go back and forward in history
 // show moves better
@@ -275,6 +275,12 @@ do_move(int board[8][8], Point src, Point dst, MoveType move_type) {
 		}
 		BRDPT(victim) = empty;
 	}
+	if (move_type == Normal && BRDPT(dst) == bP && dst.y == RANK(1)) {
+		BRDPT(dst) = bQ;
+	}
+	if (move_type == Normal && BRDPT(dst) == wP && dst.y == RANK(8)) {
+		BRDPT(dst) = wQ;
+	}
 	Point rook_src, rook_dst;
 	switch (move_type) {
 		case BlackLongCastle: