The Power 1NT Opening - Facts sheet 1a
(With 5-card majors)

Opening bid point ranges for Balanced hands :

Responses to the 1NT Opening bid :
1NT - 2♣ = Extended Stayman Convention

1NT - 2 ♦ ♥ ♠ NT = Transfer bids

1NT - 3 ♣ ♦ ♥ ♠ = 6+card suit, Slam interest

After Responder's 2♣ (Extended Stayman) :

  1. All rebids by Opener at the 2-level show a mimimum hand (17-18)

    1. 2♦ = 17-18 pts, with 4-card major

    2. 2♥ = 17-18 pts, with 5-card ♥ suit

    3. 2♠ = 17-18 pts, with 5-card ♠ suit

    4. 2NT* = 17-18 pts, no 4-card major

  2. All rebids by Opener at the 3-level show a maximum hand (19-20)

    1. 3♣ = 19-20 pts, with 4-card major

    2. 3♦* = 19-20 pts, no 4-card major

    3. 3♥ = 19-20 pts, with 5-card ♥ suit

    4. 3♠ = 19-20 pts, with 5-card ♠ suit
* After Opener's 2NT or 3♦, Responder can show his 5-card major at the 3-level.

After Opener's Opening of 1 in a suit, his rebid of 1NT shows 12-16 points.

  1. Responder's rebid of 2♣ shows 10+ points, is Crowhurst and forcing.
    Opener shows his unbid major, 3-card support for Partner's suit, or a stopper.

    1. at the 2-level = 12-13 points

    2. 2NT = 14 points exactly

    3. at the 3-level = 15-16 points

  2. All Responder's other rebids show weak unbalanced hands (6-9 pts) and may be passed.