diff --git a/src/board.rs b/src/board.rs
index 1110ceb..a743c63 100644
--- a/src/board.rs
+++ b/src/board.rs
@@ -144,14 +144,12 @@ impl Board {
         );
 
         let mut chains: Vec<Vec<(usize, usize)>> = i_chain
-            .clone()
             .into_iter()
             .map(|range| range.into_iter().map(|i| (i, j)).collect())
             .collect();
 
         chains.extend(
             j_chain
-                .clone()
                 .into_iter()
                 .map(|range| range.into_iter().map(|j| (i, j)).collect()),
         );