Conventions & Guide Section 39 : The Crowhurst 2C Convention

Crowhurst is an artificial 2 rebid by responder after opener's 1NT rebid. It applies whether the opening bid was 1 or not. The 2 rebid in each of these sequences is Crowhurst.

W E W E W E
1 1 1 1 1 1
1NT 2 1NT 2 1NT 2

 

W E W E W E
1 1 1 1 1 1
1NT 2 1NT 2 1NT 2

 

The 2 rebid shows enough values to invite game. Opener rebids 2 if minimum. Other bids show a maximum no-trump rebid  and commit the partnership to game.

If the bidding has started 1 :1, 1NT and the 1NT rebid shows 12-14 points or 12-15 points, West is worth a try for game. In standard methods, a 2
rebid is not forcing, 2 does not do the hand justice, 3 is forcing to game and so 2NT is the preferred rebid. That  may be all right if opener bids on (opener can show 3-card support via 3) but if opener passes, 2NT may not be the best partscore. Hearts may be a safer spot.

Crowhurst 2 solves this. If opener rebids 2, minimum, responder can bid 2 to play. If maximum, opener rebids 2 to show 3-card support. Bypassing 2 denies three hearts.

If the bidding starts 1 : 1, 1NT responder can rebid 2 with this hand without fear that opener might expect a better hand. A jump to the three-level over 1NT is forcing to game, 2 takes care of the game invitational hands and so other rebids
at the two-level are weak and distributional.

After 1 : 1, 1NT responder rebids 2 with this hand. If opener rebids 2, minimum, responder can rebid 2 describing the shape and strength. If opener has a maximum 1NT rebid, opener will rebid 2 with four hearts, 2 with three spades but not four hearts and 2NT or 3 without four hearts or three spades.

With a weak hand with club support, rebid with a jump to 3 as a signoff (e.g. 1 : 1, 1NT : 3 = to play) and rebid 2NT  (e.g. 1 : 1, 1NT : 2NT) as a game force with club support.

 

 

 

 

 

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