Source: Gerben’s Bridge Blog Wednesday, September 27, 2006
So when do you underlead an Ace in a trump contract? The first rule you learn is: Never!
Here are some things that could go wrong:
* An opponent could win a trick with the King he would otherwise not get.
* Even if partner has the King, this might not gain a trick.
* Partner has the King and it would gain a trick, if only he knew to put it in. He expects declarer to have the Ace and will play accordingly!
* Partner has the Queen, the King is in dummy and declarer plays small and STILL it won’t work, for example:
|K 10 3|
|A 8 7 5||Q 9 4|
|J 6 2|
On the lead of the 5, dummy plays the 3. Now East will correctly put in the 9!
This was just a short list of horrible things waiting to happen to someone who underleads an Ace. But… as always there are exceptions.
Against a slam with a void
|(4NT*)||Pass||(5 – 1 KC)||Pass|
You’re on lead with: AJT743 432 8432 –
Now the correct lead is the 3! We are likely to make exactly 1 Spade trick (declarer is not void because of Blackwood) so a ruff seems like the only possible way to beat it. We must hope partner has the King and then returns a Club to beat the contract.
Their contract will likely make and declarer has no control in the suit.
The opponents bid unopposed:
|3 (extras)||4 (non-serious cuebid)|
Now if you know that they would cuebid a singleton in opener’s suit you may consider leading a or away from Axx. This is safer than usual since partner will know you have the Ace, but declarer will not. The lead away from A loses some of its attraction if declarer can have a singleton Spade though.