diff --git a/cv9/snake.c b/cv9/snake.c
index 985cc10..a0cf258 100644
--- a/cv9/snake.c
+++ b/cv9/snake.c
@@ -35,7 +35,21 @@ void free_snake(struct snake* sn){
 }
 
 int is_snake(struct snake* snake,int x,int y){
-    return 0;
+    if(snake == NULL){
+        return NULL;
+    }
+
+    struct snake* pozicia = snake;
+
+    while(pozicia != NULL){
+        if(pozicia->x == x && pozicia->y == y){
+            return 1;
+        }
+        else{
+            return 0;
+        }
+    }
+
 }
 
 int step_state(struct state* st){