You could try Nydus if there's a gap anywhere in defenses.
Also, a huge pack of mutas often work great against a turtled terran.
Plus Broodlords don't get hit by either turrets or siege tanks.
And lastly, if you take lots of expos while the terran turtles, you can just throw units at him until he runs out of money.
___________________________________ Suipr.712 Time of RisingFormer BSG Manager
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