Takeout Doubles are useful when you have an opening hand BUT no good five card suit, fewer than 4 cards in Opener’s suit AND 3 or more cards in each of the non bid suits (tolerance)
Takeout Doubles are used on bids by opponents of up to and including 2S.
With minimum points (0-8) partner MUST bid their best suit (Major preferred) at the lowest level. So, remember that a partner’s response to your Takeout Double does not promise points.
If Responder has 9-12 HCP, then he makes an invitational Jump Bid.
With a five card Major and an Opening Hand, Responder bids game.
Responder may ONLY pass if opposition intervene and he has fewer than 6 points.
If Responder to the Takeout Double has stoppers in the bid suit then he bids NT. With 6-9 HCP bd 1NT.
With 13+ points but the best contract is unclear, Responder cue bids the opponent’s suit to get more information from partner. This is game forcing. 1D - X - PASS - 2D