diff --git a/src/commands/go.rs b/src/commands/go.rs
index bcf0fb8..ebe3abf 100644
--- a/src/commands/go.rs
+++ b/src/commands/go.rs
@@ -167,6 +167,9 @@ pub fn search_std(position: ataxx::Position, tc: StandardTC) -> ataxx::Move {
         }
     }
 
+    // Verify the tree.
+    debug_assert!(tree.verify().is_ok());
+
     tree.best_move()
 }
 
diff --git a/src/mcts/params.rs b/src/mcts/params.rs
index 0332c88..593d929 100644
--- a/src/mcts/params.rs
+++ b/src/mcts/params.rs
@@ -17,7 +17,10 @@ impl Params {
 
 pub struct Param {
     val: f64,
+
+    #[allow(unused)]
     min: f64,
+    #[allow(unused)]
     max: f64,
 }
 
@@ -26,6 +29,7 @@ impl Param {
         Param { val, min, max }
     }
 
+    #[allow(unused)]
     pub fn set(&mut self, val: f64) {
         self.val = val;
     }