the guidelines for the responder to the double, we have glossed over the responder to the opener. He does not always go so quietly...

The basic principle of the responder to the opener (the third bidder) should be to ignore the double, to make the same bid that he was planning to make without the double. But the fact that his right-hand opponent has little in partner’s opened suit, but is strong outside, has important ramifications. He should be more aggressive when supporting, but more cautious when introducing a new suit (forcing for one round as normal) or responding notrumps (point ranges perhaps a point higher).

Exercise: 1 ♥ - (Dbl) - ?

(i) 2 ♦. You were planning to respond 2 ♦. Go ahead - ignoring the double.

(ii) 3 ♥. It was close between 2 ♥ and 3 ♥ without the double (points said 2 ♥, the Losing Trick Count 3 ♥). Err on the side of aggression, to make life harder for the opponents, who almost certainly have a fit (when you have a fit, so - 98% - do they).

(iii) Pass. You would have scraped up a 1 ♠ bid without the double, giving partner another bid. To do so now, when the doubler has advertised spades, is mistaken.