How do you respond to a Stayman?

A non-Stayman responder would have to pass, because to bid would provoke a rebid. But a Stayman responder can respond to his partner's 1NT opening at level 2 if he has a 6-card non-club suit. The responder with 3 HCP and a singleton can make a similar call with a 5-card non-club suit.

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Consequently, what does an opening bid of 4 spades mean?

You can open bidding with either. The merit of four spades is that it puts maximum pressure on the opponents, especially since at this vulnerability they have to consider bidding as a sacrifice as well as to make, so that if one of them does enter the auction his partner will be unsure how much leeway to give. Accordingly, how many points do you need to bid 4 spades? With 6-9 points: Bid 1NT (or, if you have 4+ spades over a 1H opening, bid 1S). With 10-11 points and a balanced hand: Bid 2NT. With 12-13 points and a balanced hand: Bid 3NT. With 10-16 points and a 5 card suit, bid it.

Regarding this, what is a diamond bust in bridge?

Remember, from last week, the "Bust" response of Two Hearts is your artificial bid for a hand that does not contain at least one Ace, or one King or two Queens. If your hand does contain at least one Ace, or one King or two Queens, you will make a Waiting Bid of Two Diamonds. What does fourth suit forcing mean in bridge? Fourth suit forcing (also referred to as fourth suit artificial; abbreviated as FSF or 4SF) is a contract bridge convention that allows responder to create, at his second turn to bid, a forcing auction.