Blackwood

Blackwood bids show exactly how many aces Partner has. This bid is made when a team have approx 30HCP and is exploring a possible slam.
The main bidding systems are :

Blackwood asking for aces 30-41 (not advised at your level)
Blackwood 5 keys
Blackwood exclusion (this is usually bid with a void)

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Problem E6282 4 SA = A direct Blackwood (no controls necessary because S has them all !)

Blackwood 5 keys 30-41
To use this Blackwood bid a suit fit has already been established. This Blackwood allows a bid, not only showing suit quality but also the number of aces at the same time.
Instead of bidding the number of aces, Partner bids his number of keys : these keys are the ace and king of the already established trump suit.

5 ♣ : 3 or 0 keys 30
5 ♦ : 4 or 1 keys 41
5 ♥ : 2 keys and not the Queen of trump
5 ♠ : 2 keys with the Queen of trump
5 SA : 2 keys and a useful void
6 in a suit : 3 or 1 keys and a void in the suit bid

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Problem E9465 5 NT ♥ = 2 keys and a void which is ♦ in this bidding sequence.

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Problem E9466 6 ♣ = I key and a ♣ void.

Blackwood exclusion
This is used by the player when he has a void and wants to know the number of aces P holds. not including this void.
He bids using the suit where he has a void. ??????? : it's always a surprising jump that the bidder uses for this bid (his suit where he has a void)A Blackwood exclusion : jump bid in another suit which passes Game level is used after a support bid, in the agreed trump suit. The Responder bids his number of aces or keys (if a trump suit has already been agreed) excluding this suit

one level higher =3 or 0 keys
2 levels higher = 1 or 4 keys
3 levels higher = 2 keys

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Problem E95063 5 ♥ is clearly a bid for a suit already agreed upon : trump has already been fixed as spades and the jump bid has already passed Game level.
5 NT : one ace (not including the suit bid by P, ♥ s)

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Problem 92226 5 ♣ impossible bid. Blackwood exclusion asking P to bid the keys excluding the ace of ♣

How can you ask your P : Do you have the Queen of trump ?
You can bid this by bidding the suit just one level above :

With trumps being ♥ or ♠ : après la réponse de 5 ♣, la collante à 5 ♦ pose la question : avez-vous la Dame d'atout
Atout ♠ : Après la réponse de 5 ♦, la collante à 5 ♥ pose la question : avez-vous la Dame d'atout ; le camp peut encore s'arrêter avant le petit chelem.
Atout ♥ Après la réponse de 5 ♦, la collante à 5 ♥ pose la question : avez-vous la Dame d'atout ; le camp ne peut s'arrêter avant le petit chelem. Il ne faut donc poser la question que si le Grand chelem est envisageable, c'est à dire avec toutes les clés !

Quand le questionné ne possède pas la dame, il revient au palier le plus bas dans la couleur d'atout. Toutes les autres enchères promettent la dame !

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Problem E9373 5 ♥ : Do you have the Queen of trump (♠) ?

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Problem E9374 5 ♠ : I don't have the Queen of trump (returning to lowest level of agreed trump suit)

Main

Detail specifications 61JZ - Level 3 ★

Blackwood

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