Thanks for submitting. The player cannot lose because the enemy cannot build a harbour and therefore will not attack the player’s base. When you make a custom map the Standard AI plays as if it is a land map. From the editor, select Random Map and under Random Map location a water map, then change it beyond recognition. The enemy will build up a naval force, attack the player with ships and build transports for their land forces. Anyway, it plays okay and the enemy puts up a good defence with monks and onagers against your ships.