diff --git a/OpenRA.Game/WorldUtils.cs b/OpenRA.Game/WorldUtils.cs
index 252d112bee..7f030dfc22 100644
--- a/OpenRA.Game/WorldUtils.cs
+++ b/OpenRA.Game/WorldUtils.cs
@@ -87,10 +87,5 @@ namespace OpenRA
 				}
 			}
 		}
-
-		public static bool AreMutualAllies(Player a, Player b)
-		{
-			return a.RelationshipWith(b) == PlayerRelationship.Ally && b.RelationshipWith(a) == PlayerRelationship.Ally;
-		}
 	}
 }
diff --git a/OpenRA.Mods.Common/Traits/Player/StrategicVictoryConditions.cs b/OpenRA.Mods.Common/Traits/Player/StrategicVictoryConditions.cs
index dfd6bafafa..eb57eb1f0c 100644
--- a/OpenRA.Mods.Common/Traits/Player/StrategicVictoryConditions.cs
+++ b/OpenRA.Mods.Common/Traits/Player/StrategicVictoryConditions.cs
@@ -73,7 +73,7 @@ namespace OpenRA.Mods.Common.Traits
 		}
 
 		public int Total { get { return AllPoints.Count(); } }
-		int Owned { get { return AllPoints.Count(a => WorldUtils.AreMutualAllies(player, a.Owner)); } }
+		int Owned { get { return AllPoints.Count(a => a.Owner.RelationshipWith(player) == PlayerRelationship.Ally); } }
 
 		public bool Holding { get { return Owned >= info.RatioRequired * Total / 100; } }
 
diff --git a/OpenRA.Mods.Common/Traits/ProximityCapturable.cs b/OpenRA.Mods.Common/Traits/ProximityCapturable.cs
index c9cbfd4d30..94a26c2566 100644
--- a/OpenRA.Mods.Common/Traits/ProximityCapturable.cs
+++ b/OpenRA.Mods.Common/Traits/ProximityCapturable.cs
@@ -120,12 +120,6 @@ namespace OpenRA.Mods.Common.Traits
 			return pc != null && pc.Types.Overlaps(Info.CaptorTypes);
 		}
 
-		bool IsClear(Actor self, Player captorOwner)
-		{
-			return actorsInRange
-				.All(a => a.Owner == captorOwner || WorldUtils.AreMutualAllies(a.Owner, captorOwner));
-		}
-
 		void UpdateOwnership()
 		{
 			if (Captured && Info.Permanent)
@@ -153,7 +147,7 @@ namespace OpenRA.Mods.Common.Traits
 			{
 				if (Info.MustBeClear)
 				{
-					var isClear = IsClear(Self, captor.Owner);
+					var isClear = actorsInRange.All(a => captor.Owner.RelationshipWith(a.Owner) == PlayerRelationship.Ally);
 
 					// An enemy unit has wandered into the area, so we've lost control of it.
 					if (Captured && !isClear)
diff --git a/OpenRA.Mods.Common/Widgets/StrategicProgressWidget.cs b/OpenRA.Mods.Common/Widgets/StrategicProgressWidget.cs
index 3f369990a0..ecf82f4c2f 100644
--- a/OpenRA.Mods.Common/Widgets/StrategicProgressWidget.cs
+++ b/OpenRA.Mods.Common/Widgets/StrategicProgressWidget.cs
@@ -13,6 +13,7 @@ using System.Linq;
 using OpenRA.Graphics;
 using OpenRA.Mods.Common.Traits;
 using OpenRA.Primitives;
+using OpenRA.Traits;
 using OpenRA.Widgets;
 
 namespace OpenRA.Mods.Common.Widgets
@@ -48,7 +49,7 @@ namespace OpenRA.Mods.Common.Widgets
 			{
 				WidgetUtils.DrawRGBA(ChromeProvider.GetImage("strategic", "critical_unowned"), offset + new float2(rb.Left + curX, rb.Top));
 
-				if (world.LocalPlayer != null && WorldUtils.AreMutualAllies(a.Owner, world.LocalPlayer))
+				if (world.LocalPlayer != null && a.Owner.RelationshipWith(world.LocalPlayer) == PlayerRelationship.Ally)
 					WidgetUtils.DrawRGBA(ChromeProvider.GetImage("strategic", "player_owned"), offset + new float2(rb.Left + curX, rb.Top));
 				else if (!a.Owner.NonCombatant)
 					WidgetUtils.DrawRGBA(ChromeProvider.GetImage("strategic", "enemy_owned"), offset + new float2(rb.Left + curX, rb.Top));
@@ -63,7 +64,7 @@ namespace OpenRA.Mods.Common.Widgets
 			if (pendingWinner == null) return;
 			var winnerSvc = pendingWinner.PlayerActor.Trait<StrategicVictoryConditions>();
 
-			var isVictory = pendingWinner == world.LocalPlayer || !WorldUtils.AreMutualAllies(pendingWinner, world.LocalPlayer);
+			var isVictory = pendingWinner.RelationshipWith(world.LocalPlayer) == PlayerRelationship.Ally;
 			var tc = "Strategic {0} in {1}".F(
 				isVictory ? "victory" : "defeat",
 				WidgetUtils.FormatTime(winnerSvc.TicksLeft, world.Timestep));