changes

src/agent.rs

@@ -14,7 +14,7 @@ pub struct ManualAgent {
 }
 
 impl Agent for ManualAgent {
-    fn next_move(&mut self, _: &Board) -> Option<(usize, usize)> {
+    fn next_move(&mut self, board: &Board) -> Option<(usize, usize)> {
         let stdin = io::stdin();
         let mut input = String::new();
         println!("Your turn! ('Skip' to skip)");
@@ -34,8 +34,12 @@ impl Agent for ManualAgent {
                 .and_then(|x| -> Option<[usize; 2]> { x.try_into().ok() })
                 .map(|x| (x[0], x[1]));
 
-            if got.is_some() {
-                return got;
+            if let Some(got) = got {
+                if board.possible_moves(self.color).all(|x| x != got) {
+                    println!("Invalid move! Try again.");
+                    continue;
+                }
+                return Some(got);
             }
         }
     }