As responder, with a fit for opener’s suit (3+ cards), bid like this:
6-9 ponts. Raise partner's opening to 2 (1♠ P 2♠)
10-12 points. Raise to 3(1♠ P 3♠)
13+ points. Raise to game (1♠ P 4♠)
These bids are called Limit Bids, as they limit the points in the hand to within a certain range. When responder knows there’s a fit, their response may include any shortage points (in other suits), as these improve the trumping potential of the hand.
For each doubleton (2 cards in a side suit) add 1 point; each singleton (1 card in a side suit) add 3 points; and each void (0 cards in a side suit), add 5 points. Add shortage points only when a fit has been found.
When there is no immediate fit, bid your own suit if you have 6+ points. Any new suit by responder is forcing, (opener must bid again), as the partnership is still trying to find a fit. If responder bids at the next level, in their own suit, because their suit is ranked below opener's, they show a stronger hand (e.g. 1♠ p 2♦ ).
Sometimes responder has 6 – 9 points, and none of the above. The recommended response is 1NT, a limit bid.
With 6-9 points: raise to two of suit opened (1♠ p 2♠) with a three+ card fit
6+points: bid a new suit at the one-level (1♦ p 1♥) with your own suit
6-9 points: bid 1NT(1♠ p 1NT) with no fit (shows few than three spades)
10-12 points: raise to three of suit (1♠ p 3♠) with 4 card fit
10+ points: Bid a new suit at the two-level (1♠ p 2♣)
13+ points: raise to game (1♠ p 4♠) with a fit
13+ points: bid 2NT or 3NT (1♠ p 2NT or 3NT) to show a balanced hand
13+ points: bid your own suit at the two level. (1♠ p 2(♣/♦/♥) with four+ cards in your own suit).
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