Rule for extra core no-build radius per-team

core/src/mindustry/game/Rules.java

@@ -243,6 +243,10 @@ public class Rules{
         return (this.env & env) != 0;
     }
 
+    public float buildRadius(Team team){
+        return enemyCoreBuildRadius + teams.get(team).extraCoreBuildRadius;
+    }
+
     public float unitBuildSpeed(Team team){
         return unitBuildSpeedMultiplier * teams.get(team).unitBuildSpeedMultiplier;
     }
@@ -330,6 +334,9 @@ public class Rules{
         public float blockDamageMultiplier = 1f;
         /** Multiplier for building speed. */
         public float buildSpeedMultiplier = 1f;
+        /** Extra spacing added to the no-build zone around the core. */
+        public float extraCoreBuildRadius = 0f;
+
 
         //build cost disabled due to technical complexity
     }

core/src/mindustry/game/Teams.java

@@ -56,6 +56,19 @@ public class Teams{
         return Geometry.findClosest(x, y, get(team).cores);
     }
 
+    public boolean anyEnemyCoresWithinBuildRadius(Team team, float x, float y){
+        for(TeamData data : active){
+            if(team != data.team){
+                for(CoreBuild tile : data.cores){
+                    if(tile.within(x, y, state.rules.buildRadius(tile.team) + tilesize)){
+                        return true;
+                    }
+                }
+            }
+        }
+        return false;
+    }
+
     public boolean anyEnemyCoresWithin(Team team, float x, float y, float radius){
         for(TeamData data : active){
             if(team != data.team){