can't properly divide horde games

modules/game/src/main/Cached.scala

@@ -42,16 +42,17 @@ final class Cached(
     timeToLive = 5.seconds)
 
   private val count = mongoCache(
-      prefix = "game:count",
-      f = (o: JsObject) => $count(o),
-      timeToLive = defaultTtl)
+    prefix = "game:count",
+    f = (o: JsObject) => $count(o),
+    timeToLive = defaultTtl)
 
   object Divider {
 
     private val cache = Builder.size[String, chess.Division](5000)
 
-    def apply(game: Game, initialFen: Option[String]): chess.Division = {
-      Option(cache getIfPresent game.id) | {
+    def apply(game: Game, initialFen: Option[String]): chess.Division =
+      if (!Game.divisionSensiblevariants.contains(game.variant)) chess.Division.empty
+      else Option(cache getIfPresent game.id) | {
         val div = chess.Replay.boards(
           moveStrs = game.pgnMoves,
           initialFen = initialFen,
@@ -60,6 +61,5 @@ final class Cached(
         cache.put(game.id, div)
         div
       }
-    }
   }
 }

modules/game/src/main/Game.scala

@@ -455,6 +455,14 @@ object Game {
     chess.variant.ThreeCheck,
     chess.variant.KingOfTheHill)
 
+  val divisionSensiblevariants: Set[Variant] = Set(
+    chess.variant.Standard,
+    chess.variant.Chess960,
+    chess.variant.ThreeCheck,
+    chess.variant.KingOfTheHill,
+    chess.variant.Antichess,
+    chess.variant.FromPosition)
+
   val analysableVariants: Set[Variant] = Set(
     chess.variant.Standard,
     chess.variant.Chess960,