diff --git a/chess_uci/src/lib.rs b/chess_uci/src/lib.rs
index f36acfd..a6d3454 100644
--- a/chess_uci/src/lib.rs
+++ b/chess_uci/src/lib.rs
@@ -12,7 +12,7 @@ use std::time::Duration;
 use chess::{Board, ChessMove, Game, Action};
 
 const DEFAULT_TIME: (Option<Duration>, Option<Duration>) =
-    (Some(Duration::from_secs(120 * 60)), None);
+    (Some(Duration::from_secs(90 * 60)), None);
 
 /// Structure used to manage a chess game with a uci engine.
 ///
@@ -44,7 +44,7 @@ pub struct UciEngine<Fi: Read, Fo: Write> {
     initial: Board,
     game: Game,
     /// white (total, incr), black (total, incr)
-    time: [(Option<Duration>, Option<Duration>); 2],
+    timer: [(Option<Duration>, Option<Duration>); 2],
     /// white, black
     player: [Player; 2],
 }
@@ -77,7 +77,7 @@ impl<Fi: Read, Fo: Write> UciEngine<Fi, Fo> {
             uciok: false,
             initial: Board::default(),
             game: Game::new(),
-            time: [DEFAULT_TIME; 2],
+            timer: [DEFAULT_TIME; 2],
             player: [Player::Human { elo: None }; 2],
         }
     }
@@ -88,16 +88,16 @@ impl<Fi: Read, Fo: Write> UciEngine<Fi, Fo> {
             GameOption::TotalTime { color, value } => {
                 old_value = GameOption::TotalTime {
                     color,
-                    value: self.time[color.to_index()].0,
+                    value: self.timer[color.to_index()].0,
                 };
-                self.time[color.to_index()].0 = value
+                self.timer[color.to_index()].0 = value
             }
             GameOption::Increment { color, value } => {
                 old_value = GameOption::Increment {
                     color,
-                    value: self.time[color.to_index()].1,
+                    value: self.timer[color.to_index()].1,
                 };
-                self.time[color.to_index()].1 = value
+                self.timer[color.to_index()].1 = value
             }
             GameOption::Player { color, value } => {
                 old_value = GameOption::Player {
@@ -359,8 +359,8 @@ impl<Fi: Read, Fo: Write> UciEngine<Fi, Fo> {
                             option: Opt::UCIElo { value: elo },
                         });
                     }
-                    let (wtime, wincr) = self.time[Color::White.to_index()];
-                    let (btime, bincr) = self.time[Color::Black.to_index()];
+                    let (wtime, wincr) = self.timer[Color::White.to_index()];
+                    let (btime, bincr) = self.timer[Color::Black.to_index()];
                     self.push(GuiCommand::Go {
                         wtime,
                         wincr,
@@ -397,5 +397,19 @@ impl<Fi: Read, Fo: Write> UciEngine<Fi, Fo> {
     pub fn side_to_move(&self) -> Color {
         self.game.side_to_move()
     }
+
+    pub fn clock(&self, color: Color) -> Option<Duration> {
+        self.timer[if color == Color::White {0} else {1}].0
+    }
+
+    pub fn update_clock(&mut self, elapsed: Duration) {
+        let index = if self.side_to_move() == Color::White {0} else {1};
+        self.timer[index] =
+            match self.timer[index] {
+                (Some(base), None) => (Some(base - elapsed), None),
+                (Some(base), Some(incr)) => (Some(base - elapsed + incr), Some(incr)),
+                _ => (None, None)
+        };
+    }
 }
 //  LocalWords:  uci