You open, at IMP's, red-on-white, 1♠. Partner bids a forcing 1NT (2/1 GF), and your RHO intervenes with 3♣. What action you you take?
In answering, feel free to define what each alternative suggests.
BTW, there was massive disagreement among extremely talented players.
As a secondary problem, assume that the "solution" is to bid 3H. Even if you object, assume this anyway for Part II. What would 4♣ by responder mean after 1♠-P-1NT-3♣-3♥-P-??? What would 3♠ in that auction, instead of 4♣, show???

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