diff --git a/src/main.rs b/src/main.rs
index 1712d1e..c693942 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -115,11 +115,12 @@ impl Game {
             for y in 0..self.height {
                 let dx = rng.random_range(-1..=1);
                 let dy = rng.random_range(-1..=1);
-                if dx == dy {
+                let (ox, oy) = (x + dx, y + dy);
+
+                if (x, y) == (ox, oy) {
                     continue;
                 }
 
-                let (ox, oy) = (x + dx, y + dy);
                 let Some(other) = self.at(ox, oy) else {
                     continue;
                 };