100% unbeatable. The Mongol player builds a ger or two at their base, then speed-TC rushes with their only TC. Your villagers have to chase it to burn it down, until they put some spears in it at which point you have to garrison inside your TC, while the Mongol player mines slowley from home.
Builds proxy pylon and cannons behind your minerals Builds hatchery at your natural Builds 2, 6min battle cruiser and ports them into your mineral line