diff --git a/src/bin/movegen_tool.rs b/src/bin/movegen_tool.rs
index 56ad263..5187311 100644
--- a/src/bin/movegen_tool.rs
+++ b/src/bin/movegen_tool.rs
@@ -6,11 +6,10 @@ use chess_inator::movegen::LegalMoveGen;
 use std::env;
 
 fn main() {
-    for arg in env::args().skip(2) {
-        let board = Board::from_fen(&arg).unwrap();
-        let mvs = board.gen_moves();
-        for mv in mvs.into_iter() {
-            println!("{mv:?}")
-        }
+    let fen = env::args().nth(1).unwrap();
+    let board = Board::from_fen(&fen).unwrap();
+    let mvs = board.gen_moves();
+    for mv in mvs.into_iter() {
+        println!("{mv:?}")
     }
 }
diff --git a/src/bin/perft_tool.rs b/src/bin/perft_tool.rs
new file mode 100644
index 0000000..6d76479
--- /dev/null
+++ b/src/bin/perft_tool.rs
@@ -0,0 +1,14 @@
+//! Runs perft at depth for a given FEN.
+
+use chess_inator::Board;
+use chess_inator::fen::FromFen;
+use chess_inator::movegen::perft;
+use std::env;
+
+fn main() {
+    let depth = env::args().nth(1).unwrap().parse::<usize>().unwrap();
+    let fen = env::args().nth(2).unwrap();
+    let mut board = Board::from_fen(&fen).unwrap();
+    let res = perft(depth, &mut board);
+    println!("{res}")
+}