Trump promotion of a 4

Here's a nice hand for the defense.

Dealer: West Vul: NS Scoring: MP	♠ J82 ♥ Q7543 ♦ K432 ♣ 5
♠ 965 ♥ 98 ♦ QJT5 ♣ AQ42		♠ K743 ♥ KJT2 ♦ A7 ♣ T86
	♠ AQT ♥ A6 ♦ 986 ♣ KJ973

The bidding somehow got NS in 2♣

Partner lead the ♥9, small, small to the Ace. South played ♦9 (covered by the 10) to his King and my Ace. Now I returned ♦7 and made the trick. So I continued with ♥K and small ♥ where declarer discarded his last ♦ and my partner ruffed with the ♣2.

Now ♦Q was played and I ruffed with ♣T, overruffed with the J. Next, declarer played ♣9 to partner's Q and another ♦ was ruffed with the 8 and declarer's ♣J.

At this point, partner had ♣A4 and declarer ♣73, which promoted the 4 in partner's hand! -2 was a top, obviously...

Interference over strong 1C

Interference over a strong ♣ should cause troubles. On the following hand, my LHO convinced me to stay out of slam, whereas if she wouldn't have bid I'd be in 6♥ for sure!

Dealer: South Vul: None Scoring: MP	♠ Axx ♥ AQx ♦ Q9xx ♣ Jxx
♠ KQJxxx ♥ x ♦ Kxx ♣ xxx		♠ xxx ♥ JTxx ♦ Txx ♣ xxx
	♠ x ♥ K9xxx ♦ AJx ♣ AKQx

Bidding:
1♣* - 2♠ - Dbl - pass
3♥ - pass - 3♠ - pass
4♣ - pass - 4♥ - all pass

1♣ showed 15+hcp any distribution, Dbl showed a semipositive hand (or GF without 5 card suit). I'd prefer a 2NT bid instead of the Dbl, but it's a matter of preference. If South has ♠Qx, 3NT should be played there...
According to the bidding, my partner showed a mild slam invite with ♥ fit. Slam has lots of possible ways to make (♦Kx with East, stiff ♥T or J with West, or ♥ 3-2), but I decided to pass since LHO showed 9-11HCP with 6+♠ according to my RHO.

I was very glad to see a small ♥ singleton on my left side :-)

Lucky preempting

Lets start with some heavy preempting. A little luck always helps, but you can't argue with success. On average, I'd never bid this high!

Dealer: South Vul: None Scoring: MP	♠ QJxx ♥ xx ♦ Jxxx ♣ xxx
♠ Kxx ♥ AJTxxx ♦ xx ♣ Jx		♠ Axxxx ♥ Qxx ♦ K ♣ Axxx
	♠ x ♥ Kx ♦ AQTxxx ♣ KQxx

Bidding went:
1♠* - 2♥ - 4NT*! - Dbl
5♦ - all pass

1♠ shows 9-14HCP, 4+♦, unbalanced, longer ♣ possible, no 5+M

After the 2♥ bid, I thought opponents had 4♥ laydown. Bidding low would probably not work, so I thought 'lets make it hard on opponents'. 4NT asked partner to bid his longest/best minor, but 5♦ probably puts more pressure.

West's pass was forcing, but East somehow didn't agree. However, with the current lie of the cards, 5♦x-2 is still better than 4♥=.

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