Add three-member short alliance prototype

game/victory-progress.ts

@@ -154,7 +154,8 @@ export function strongholdProgress(
         );
       const target = allianceVictoryTarget(
         players.map((player) => player.id), g.twoPlayerControllers, members.length > 1,
-        g.coalitionState?.variant === 'unlimited' ? true : members.length >= 3 ? false : g.shortAllianceVictory,
+        g.coalitionState?.variant === 'unlimited' || g.coalitionState?.variant === 'three-short'
+          ? true : members.length >= 3 ? false : g.shortAllianceVictory,
       ) + extra;
       return {
         player: id,