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If you have a good hand with a 5-5 shape over 2NT, you can
transfer to one suit and then bid the other at the four level.
But with a weak 5-5, you can't risk going past 3NT. If you bid
both suits, partner will think your hand is better. This convention,
created by Al Roth, works like this. After a 2NT opening (or 2
followed by 2NT rebid over a negative response), responder:

- transfers to a major and rebids 3NT to show a weak 5-5;
- transfers to a major and rebids at the four level to show a good 5-5;
- transfers to hearts and then rebids 3 to show 5 hearts, a game
   force, without another five-card suit;
- starts with Stayman and rebids 3 (or 3 if opener bids 3 and
   you are playing Smolen) with 5 spades, a game force, without
   another five-card suit.

Opposite our example hand, South holds

    A 3
    A 8 7
    A K 10 3
    K Q J 2

He removes 3NT to 4 and you reach 5 or 6.

    Q 3
    A K J 8
    A K 3
    K J 10 2

He passes and plays 3NT.