diff --git a/src/main/java/com/fundynamic/d2tm/game/entities/EntitiesSet.java b/src/main/java/com/fundynamic/d2tm/game/entities/EntitiesSet.java
index b53af55c..e641a8e7 100644
--- a/src/main/java/com/fundynamic/d2tm/game/entities/EntitiesSet.java
+++ b/src/main/java/com/fundynamic/d2tm/game/entities/EntitiesSet.java
@@ -49,6 +49,10 @@ public boolean hasAny() {
         return size() > 0;
     }
 
+    public boolean hasOne() {
+        return size() == 1;
+    }
+
     /**
      *
      * Returns first element or null when size is 0
diff --git a/src/main/java/com/fundynamic/d2tm/game/entities/predicates/BelongsToPlayer.java b/src/main/java/com/fundynamic/d2tm/game/entities/predicates/BelongsToPlayer.java
index edf9062b..509d7142 100644
--- a/src/main/java/com/fundynamic/d2tm/game/entities/predicates/BelongsToPlayer.java
+++ b/src/main/java/com/fundynamic/d2tm/game/entities/predicates/BelongsToPlayer.java
@@ -5,11 +5,16 @@
 import com.fundynamic.d2tm.game.entities.Player;
 import com.fundynamic.d2tm.game.entities.Predicate;
 
+import java.util.HashMap;
+import java.util.Map;
+
 public class BelongsToPlayer extends Predicate<Entity> {
 
+    private static Map<Player, BelongsToPlayer> instances = new HashMap<>();
+
     private final Player playerItShouldBelongTo;
 
-    public BelongsToPlayer(Player playerItShouldBelongTo) {
+    private BelongsToPlayer(Player playerItShouldBelongTo) {
         this.playerItShouldBelongTo = playerItShouldBelongTo;
     }
 
@@ -24,4 +29,12 @@ public String toString() {
                 "playerItShouldBelongTo=" + playerItShouldBelongTo +
                 '}';
     }
+
+    public static BelongsToPlayer instance(Player playerItShouldBelongTo) {
+        if (!instances.containsKey(playerItShouldBelongTo)) {
+            instances.put(playerItShouldBelongTo, new BelongsToPlayer(playerItShouldBelongTo));
+        }
+        return instances.get(playerItShouldBelongTo);
+    }
+
 }
diff --git a/src/main/java/com/fundynamic/d2tm/game/entities/predicates/NotPredicate.java b/src/main/java/com/fundynamic/d2tm/game/entities/predicates/NotPredicate.java
index 2f4fe90b..7a1fe18c 100644
--- a/src/main/java/com/fundynamic/d2tm/game/entities/predicates/NotPredicate.java
+++ b/src/main/java/com/fundynamic/d2tm/game/entities/predicates/NotPredicate.java
@@ -3,6 +3,9 @@
 import com.fundynamic.d2tm.game.entities.Entity;
 import com.fundynamic.d2tm.game.entities.Predicate;
 
+/**
+ * Inverses the result of the given predicate.
+ */
 public class NotPredicate extends Predicate<Entity> {
 
     private final Predicate<Entity> predicateToNegate;
diff --git a/src/main/java/com/fundynamic/d2tm/game/entities/predicates/PredicateBuilder.java b/src/main/java/com/fundynamic/d2tm/game/entities/predicates/PredicateBuilder.java
index bda1b7d6..360940df 100644
--- a/src/main/java/com/fundynamic/d2tm/game/entities/predicates/PredicateBuilder.java
+++ b/src/main/java/com/fundynamic/d2tm/game/entities/predicates/PredicateBuilder.java
@@ -7,7 +7,6 @@
 import com.fundynamic.d2tm.game.entities.Predicate;
 import com.fundynamic.d2tm.math.Coordinate;
 import com.fundynamic.d2tm.math.Rectangle;
-import com.fundynamic.d2tm.math.Vector2D;
 
 import java.util.LinkedList;
 import java.util.List;
@@ -27,7 +26,7 @@ public PredicateBuilder() {
     }
 
     public PredicateBuilder forPlayer(Player player) {
-        predicates.add(new BelongsToPlayer(player));
+        predicates.add(BelongsToPlayer.instance((player)));
         return this;
     }
 
@@ -47,6 +46,16 @@ public Predicate build() {
         return new AndPredicate(predicates);
     }
 
+    public PredicateBuilder belongsToPlayer(Player playerItShouldBelongTo) {
+        predicates.add(BelongsToPlayer.instance(playerItShouldBelongTo));
+        return this;
+    }
+
+    public PredicateBuilder isEntityBuilder() {
+        predicates.add(IsEntityBuilder.instance);
+        return this;
+    }
+
     public PredicateBuilder isSelectable() {
         predicates.add(Predicate.isSelectable());
         return this;
diff --git a/src/main/java/com/fundynamic/d2tm/game/entities/units/Unit.java b/src/main/java/com/fundynamic/d2tm/game/entities/units/Unit.java
index 3a8e4f20..8101d353 100644
--- a/src/main/java/com/fundynamic/d2tm/game/entities/units/Unit.java
+++ b/src/main/java/com/fundynamic/d2tm/game/entities/units/Unit.java
@@ -109,7 +109,7 @@ public void update(float deltaInSeconds) {
                 // scan environment within range for enemies
                 EntitiesSet entities = entityRepository.findEntitiesOfTypeAtVectorWithinDistance(getCenteredCoordinate(), entityData.sight * 32, EntityType.UNIT, EntityType.STRUCTURE);
 
-                EntitiesSet enemyEntities = entities.filter(new NotPredicate(new BelongsToPlayer(player)));
+                EntitiesSet enemyEntities = entities.filter(new NotPredicate(BelongsToPlayer.instance(player)));
 
                 if (enemyEntities.isEmpty()) {
                     if (this.getPlayer().isCPU()) {
@@ -131,7 +131,7 @@ public void update(float deltaInSeconds) {
                             attack(enemyToAttack);
                         } else {
                             EntitiesSet allUnits = entityRepository.allUnits();
-                            enemyEntities = allUnits.filter(new NotPredicate(new BelongsToPlayer(player)));
+                            enemyEntities = allUnits.filter(new NotPredicate(BelongsToPlayer.instance((player))));
 
                             distance = 131072; // 64X64X32
                             enemyToAttack = null;
diff --git a/src/main/java/com/fundynamic/d2tm/game/rendering/gui/battlefield/BattleField.java b/src/main/java/com/fundynamic/d2tm/game/rendering/gui/battlefield/BattleField.java
index 0b184418..abe6ccda 100644
--- a/src/main/java/com/fundynamic/d2tm/game/rendering/gui/battlefield/BattleField.java
+++ b/src/main/java/com/fundynamic/d2tm/game/rendering/gui/battlefield/BattleField.java
@@ -5,6 +5,7 @@
 import com.fundynamic.d2tm.game.controls.battlefield.CellBasedMouseBehavior;
 import com.fundynamic.d2tm.game.controls.battlefield.NormalMouse;
 import com.fundynamic.d2tm.game.entities.*;
+import com.fundynamic.d2tm.game.entities.predicates.PredicateBuilder;
 import com.fundynamic.d2tm.game.map.Cell;
 import com.fundynamic.d2tm.game.map.Map;
 import com.fundynamic.d2tm.game.map.Perimeter;
@@ -264,13 +265,16 @@ public void setViewingVector(Vector2D viewingVector) {
     @Override
     public void entitiesSelected(EntitiesSet entities) {
         System.out.println("Battlefield gets told that " + entities + " are selected");
-        EntitiesSet entityBuilders = entities.filter(Predicate.isEntityBuilder());
 
-        if (entityBuilders.size() == 1) {
+        EntitiesSet entityBuildersForControllingPlayer = entities.filter(
+                Predicate.builder()
+                        .belongsToPlayer(mouse.getControllingPlayer())
+                        .isEntityBuilder()
+        );
+
+        if (entityBuildersForControllingPlayer.hasOne()) {
             Entity first = entities.getFirst();
-            if (first.isEntityBuilder()) {
-                guiComposite.entityBuilderSelected(first);
-            }
+            guiComposite.entityBuilderSelected(first);
         } else {
             guiComposite.allEntityBuildersDeSelected();
         }
diff --git a/src/test/java/com/fundynamic/d2tm/game/entities/EntitiesSetTest.java b/src/test/java/com/fundynamic/d2tm/game/entities/EntitiesSetTest.java
index 29cf7533..1e7aed80 100644
--- a/src/test/java/com/fundynamic/d2tm/game/entities/EntitiesSetTest.java
+++ b/src/test/java/com/fundynamic/d2tm/game/entities/EntitiesSetTest.java
@@ -72,14 +72,14 @@ public void setUp() throws SlickException {
 
     @Test
     public void filtersForPlayer() {
-        Set<Entity> result = entitiesSet.filter(new BelongsToPlayer(player));
+        Set<Entity> result = entitiesSet.filter(BelongsToPlayer.instance(player));
         assertEquals(playerOneStructureCount + playerOneUnitCount + playerOneBareEntitiesCount, result.size());
     }
 
     @Test
     public void filtersNotForPlayer() {
         // get everything except player one
-        Set<Entity> result = entitiesSet.filter(new NotPredicate(new BelongsToPlayer(player)));
+        Set<Entity> result = entitiesSet.filter(new NotPredicate(BelongsToPlayer.instance(player)));
         // player 2 has 6 entities
         assertEquals(6, result.size());
     }