Rubensohl

Continuation after opps overcall our 1NT

1NT - (2♣ natural) - 3♣ - 3♦ -

3♥    =    4 card ♥ (does not deny 4 card ♠)    ➲

3♠    =    4 card ♠ (denies 4 card ♥)    ➲

If no fit and no ST, RE bids cheapest 4 card suit