After GIB opens 2♣, NT overcalls in direct seat have no bid definitions. I've played with it a bit and it looks like you can shut it down by doing something like bidding 3NT on air when favorable. It's a gamble but it's too risk-free currently because I've yet to get GIB to X me here. Either it goes AP for a good board usually or they bid over it more or less normally.
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Weakness in GIB's system A free psyche
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