.

src/main/java/model/FirefighterBoard.java

@@ -117,7 +117,7 @@ public class FirefighterBoard implements Board<List<ModelElement>> {
         List<Position> modifiedPositions = new ArrayList<>();
 
         // Spread fire every two rounds
-        if (step % 2 == 0) {
+        if (step % 2 == 1) {
             firePositions.addAll(spreadFire());
             modifiedPositions.addAll(firePositions);
         }