diff --git a/Cargo.lock b/Cargo.lock
index 5155fce..5c8c3be 100644
--- a/Cargo.lock
+++ b/Cargo.lock
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+checksum = "078775d0255232fb988e6fccf26ddc9d1ac274299aaedcedce21c6f72cc533ce"
diff --git a/Cargo.toml b/Cargo.toml
index 14629ba..c65453e 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -22,7 +22,7 @@ debug = true
 opt-level = 3
 
 [dependencies]
-chess = "3.1.1"
+chess = "3.2"
 shakmaty = "0.15.0"
 getopts = "0.2.19"
 
diff --git a/src/main.rs b/src/main.rs
index a25dc2c..cae1003 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -32,7 +32,7 @@ fn main() {
 
     let matches = match opts.parse(&args[1..]) {
         Ok(m) => m,
-        Err(f) => panic!(f.to_string()),
+        Err(f) => panic!("{}", f),
     };
 
     if matches.opt_present("h") {
diff --git a/src/perft.rs b/src/perft.rs
index a3cb15e..05091db 100644
--- a/src/perft.rs
+++ b/src/perft.rs
@@ -1,50 +1,36 @@
 use chess::{Board, MoveGen};
 use shakmaty::{fen::Fen, perft as sperft, Chess};
 use std::str::FromStr;
-use std::time::SystemTime;
+use std::time::Instant;
 
 pub fn perform_perft(fen: String, depth: u64, chess: bool, shakmaty: bool) {
     if chess {
         let board = Board::from_str(&fen).unwrap();
-        let start = SystemTime::now();
+        let start = Instant::now();
         let result = MoveGen::movegen_perft_test(&board, depth as usize) as u64;
-        let duration = SystemTime::now().duration_since(start);
-        match duration {
-            Ok(clock) => {
-                println!(
-                    "chess   : Perft {} of {}\tResult: {}\tTime: {}s {}ms",
-                    depth,
-                    fen,
-                    result,
-                    clock.as_secs(),
-                    clock.subsec_nanos() / 1000000
-                );
-            }
-            Err(_) => {
-                panic!();
-            }
-        }
+        let duration = start.elapsed();
+        println!(
+            "chess   : Perft {} of {}\tResult: {}\tTime: {}s {}ms",
+            depth,
+            fen,
+            result,
+            duration.as_secs(),
+            duration.subsec_nanos() / 1000000
+        );
     }
     if shakmaty {
         let setup: Fen = fen.parse().expect("invaild fen");
         let position: Chess = setup.position().expect("invalid setup");
-        let start = SystemTime::now();
+        let start = Instant::now();
         let result = sperft(&position, depth as u32);
-        let duration = SystemTime::now().duration_since(start);
-        match duration {
-            Ok(clock) => {
-                println!(
-                    "shakmaty: Perft {} of {}\tResult: {}\tTime: {}s {}ms",
-                    depth,
-                    fen,
-                    result,
-                    clock.as_secs(),
-                    clock.subsec_nanos() / 1000000
-                );
-            }
-            Err(_) => {
-                panic!();
-            }
-        }
+        let duration = start.elapsed();
+        println!(
+            "shakmaty: Perft {} of {}\tResult: {}\tTime: {}s {}ms",
+            depth,
+            fen,
+            result,
+            duration.as_secs(),
+            duration.subsec_nanos() / 1000000
+        );
     }
 }