Not every board against Izzy and Pamela was as sweet as the Diamond slam (though we won the set.)  Here was our one double-digit disaster:

As I've said before, I used to be a big fan of opening 5 card majors at favorable vulnerability.  Now I do it rarely, but only in 1st and 3rd and with good suits.  One of the big problems with the style is when it pushes opponents into hopeless contracts, but you then forget to beat them. 

In the middle of a great set (11 boards in and one big swing, 2 decent (but not spectacular) slams and no bad boards) I decided to take Zia's advice (when things are going well, go with your gut) and opened 2 Spades on:

AT984 / A53 / 86 / 843 in first seat at favorable.

I think the bid is probably percentage in the long run, but only mildly so, and it's probably better to just pass the hand rather than risk incurring partner's wrath or annoyance when the result is less than stellar.  Why do I think it's percentage?  It's a good lead direct, it describes your values exactly (pard tends to play a weak 2 for about an 8 count) and has a 2-1 chance of preempting the strongest hand at the table (hopefully one of your opponents.)

Izzy passed on my left, Jeff passed, and Pamela bid 3 Diamonds.  So far so good, I thought.  Izzy bid 3NT and Jeff led the 7 of Spades:

K5 / J9 / AK7542 / 752 Dummy (on your Right)

AT984 / A53 / 86 / 843

I chose to encourage with the 4 of Spades instead of overtaking (maybe partner can figure out the spade situation when I make this play, since I would surely overtake with AJT9xx or AT98xx) when Izzy plays low from dummy and wins the Queen, leads the Nine of Diamonds to Jeff's Queen and ducks in dummy.

Now Jeff plays the Deuce of Spades to Dummy's King and your Ace and you're up.

Izzy has 5 Diamonds ready to cash.  She's won a Spade already and has another high Spade in reserve.  Does Jeff have KQx or better in Hearts or either the Ace or King of Clubs?  If Jeff has a top club, a Spade now guarantees down 1, Izzy will score 2 Spades, 5 Diamonds and at most 1 Club.  If Jeff has KQx(x) of Hearts and no top Club, a Heart switch is mandatory, or else Izzy will score 2 Spades, 5 Diamonds and 2 Clubs.

I think it's percentage to play Jeff for one of the 2 top clubs instead of specifically the King Queen of Hearts.  That's what I did.  That was not the right play.

Izzy gratefully won her 2nd Spade trick and then took her 7 top tricks in the minors.  Jeff decided to ignore my signals and pitched away his Club guard, allowing Izzy to score her AKJ, so I ignored my count on the hand and pitched away my top Spade at trick 12 (instead of my Heart Ace) and Izzy scored 2 overtricks, but the uptricks were only worth a quarter of an IMP.  -660 was 10.73 IMPs away

Izzy's hand:

K5 / J9 / AK7542 / 752

QJ63 / T876 / T9 / AKJ

Jeff's hand:

72 / KQ42 / QJ3 / QT96

Could Jeff have gotten it right?  I think he had a small chance after my play to trick 1.  He knows that Izzy has Spades double stopped and 5 Diamonds ready to go.  If she has both bullets in the round suits, that's 9 tricks.  Hearts are probably 4-3 and if I have EITHER the Ace or Ten of Hearts, this goes down on a top Heart switch (if it can ever be beaten.)  But that's pretty tough to find at the table.  And it's not 100%, since if I don't have either the Ace or Ten of Hearts and I have the Ace of Clubs, you still need the Spade continuation.

'5 card weak 2's are for maniacs' (said much later, in good humor, we don't rile each other up when a bad result is fresh.)