diff --git a/cv9/snake.c b/cv9/snake.c
index a897483..1b1717a 100644
--- a/cv9/snake.c
+++ b/cv9/snake.c
@@ -30,6 +30,12 @@ void free_snake(struct snake* sn) {
 }
 
 int is_snake(struct snake* snake,int x,int y){
+    while (snake != NULL) {
+        if (snake->x == x && snake->y == y) {
+            return 1;
+        }
+        snake = snake->next;
+    }
     return 0;
 }