Conventions are important and here's an example of using the right
tools to stay out of trouble. Take a look.
Scoring: Matchpoints (Pairs)
Hand #26
Dlr
N
Vul
E/W
A63
KQ6
J1098
KQJ
10
J109752
2
98763
54
A43
A7653
1052
KQJ9872
8
KQ4
A4
West
North
East
South
1NT
Pass
4*
Pass
4
Pass
4
All Pass
*Gerber
BIDDING: South was interested in slam as soon as he heard
his partner's 1NT opening bid. His leap to 4 was the
Gerber convention asking for the number of aces. The 4
response showed only one so South reluctantly signed off in game.
PLAY: With no
attractive lead, West led his singleton diamond and hit pay dirt when
his partner won the ace. East returned the seven of diamonds
requesting a heart return (higher of the other two suits). West
ruffed and East won the heart continuation but West had no more trumps
so declarer scored up the game. The pairs who first bid their
spade suit and then used Blackwood ended up in 5 down one on
the same defense. Those unsuccessful pairs were certainly
unlucky, but the South hand needs only to discover the number of aces
and the Gerber convention was invented just for that purpose.
The Gerber convention is generally used after a 1NT or 2NT opening
bid. It may also be used after a jump in NT.