diff --git a/MultiversalDiplomacy/Model/World.cs b/MultiversalDiplomacy/Model/World.cs
index 95ce678..53f4c82 100644
--- a/MultiversalDiplomacy/Model/World.cs
+++ b/MultiversalDiplomacy/Model/World.cs
@@ -37,7 +37,7 @@ public class World
     /// <summary>
     /// The first season of the game.
     /// </summary>
-    public Season RootSeason => GetSeason("a", 0);
+    public Season RootSeason => GetSeason("a0");
 
     /// <summary>
     /// All units in the multiverse.
@@ -227,13 +227,7 @@ public class World
     /// Get a season by coordinate. Throws if the season is not found.
     /// </summary>
     public Season GetSeason(string timeline, int turn)
-    {
-        Season? foundSeason = this.Seasons.SingleOrDefault(
-            s => s!.Turn == turn && s.Timeline == timeline,
-            null)
-            ?? throw new KeyNotFoundException($"Season {timeline}@{turn} not found");
-        return foundSeason;
-    }
+        => GetSeason($"{timeline}{turn}");
 
     public Season GetSeason(string designation)
         => SeasonLookup[designation];
diff --git a/MultiversalDiplomacyTests/MDATC_A.cs b/MultiversalDiplomacyTests/MDATC_A.cs
index 0c95464..8b1b70b 100644
--- a/MultiversalDiplomacyTests/MDATC_A.cs
+++ b/MultiversalDiplomacyTests/MDATC_A.cs
@@ -42,7 +42,7 @@ public class TimeTravelTest
             "Failed to fork timeline when unit moved in");
 
         // Confirm that there is a unit in Tyr b1 originating from Mun a1
-        Season fork = world.GetSeason("b", 1);
+        Season fork = world.GetSeason("b1");
         Unit originalUnit = world.GetUnitAt("Mun", s0.Coord);
         Unit aMun0 = world.GetUnitAt("Mun", s1.Coord);
         Unit aTyr = world.GetUnitAt("Tyr", fork.Coord);
@@ -91,7 +91,7 @@ public class TimeTravelTest
 
         // Confirm that an alternate future is created.
         World world = setup.UpdateWorld();
-        Season fork = world.GetSeason("b", 1);
+        Season fork = world.GetSeason("b1");
         Unit tyr1 = world.GetUnitAt("Tyr", fork.Coord);
         Assert.That(
             tyr1.Past,
diff --git a/MultiversalDiplomacyTests/MovementAdjudicatorTest.cs b/MultiversalDiplomacyTests/MovementAdjudicatorTest.cs
index 871911c..2c35dd1 100644
--- a/MultiversalDiplomacyTests/MovementAdjudicatorTest.cs
+++ b/MultiversalDiplomacyTests/MovementAdjudicatorTest.cs
@@ -199,7 +199,7 @@ public class MovementAdjudicatorTest
         World updated = setup.UpdateWorld();
 
         // Confirm the future was created
-        Season s2 = updated.GetSeason("a", 1);
+        Season s2 = updated.GetSeason("a1");
         Assert.That(s2.Past, Is.EqualTo(s1.ToString()));
         Assert.That(s2.Futures, Is.Empty);
         Assert.That(s2.Timeline, Is.EqualTo(s1.Timeline));