1 files changed, 10 insertions, 0 deletions

diff --git a/src/roulette.rs b/src/roulette.rs
index 6b73c2a..b697e31 100644
--- a/src/roulette.rs
+++ b/src/roulette.rs
@@ -226,6 +226,16 @@ impl Bets {
         }
     }
 
+    /// Take `amount` back from one target, dropping the chip when it empties.
+    ///
+    /// This is the felt undo: a right or middle click removes one chip.
+    pub fn reduce(&mut self, target: &BetTarget, amount: u64) {
+        if let Some(chip) = self.chips.iter_mut().find(|chip| &chip.target == target) {
+            chip.amount = chip.amount.saturating_sub(amount);
+        }
+        self.chips.retain(|chip| chip.amount > 0);
+    }
+
     /// Total returned for a winning number, including returned stakes.
     pub fn winnings(&self, number: u8) -> u64 {
         self.chips.iter().fold(0u64, |total, chip| {