Connect staged Advanced classic group alliances

game/allied-separation.ts

@@ -3,6 +3,7 @@ import { ecazOccupancyRelation } from './ecaz-occupy';
 import { presenceAt, type ForcePresence } from './force-presence';
 import type { OccupancySeat } from './occupancy';
 import { coalitionAllies, coalitionGroups, type CoalitionState } from './coalition-alliance';
+import { FACTIONS } from './catalog';
 
 /** Physical baseline distinguishes this turn's visitors from old co-occupation. */
 export type BasicAlliedShipment = Readonly<{
@@ -40,8 +41,9 @@ function currentShipmentAllies(context: ShipmentContext, player: OccupancySeat):
   }));
   const groups = coalitionGroups(seats, context.coalitionState);
   if (groups.some(group => group.members.length >= 3) &&
-      (context.advanced || context.players.some(seat => seat.faction === 'ecaz')))
-    throw new Error('Three-member shipment rules require Basic play without Ecaz.');
+      (context.players.some(seat => seat.faction === 'ecaz') || context.advanced &&
+        context.players.some(seat => !FACTIONS.some(faction => faction.id === seat.faction && faction.expansion === 'base'))))
+    throw new Error('Larger alliance shipment rules require a supported roster without Ecaz.');
   return coalitionAllies(seats, context.coalitionState, player.id);
 }