I subbed for a couple of boards in a matchpoints tourney on BBO last night.  This was a pretty tough hand:

All white in 1st:

 

K7 / JT86 / K3 / AQ973

 

I opened 1 Club, pard bid 1 Spade, I bid 1NT and my partner raised me to 3NT.

 

The 2 of Diamonds is led to the Ace and the Jack comes back.

 

QJ65 / AQ4 / 987 / K64

 

K7 / JT86 / K3 / AQ973

What's the plan?

If you ask, you learn that the opponents play standard leads (presumably 4th best here.)  If that's the case, you can afford to attack Spades instead of putting all your eggs in the Heart finesse basket.

I thought I had a pretty good line.  I played the Queen of Clubs and a Club over to make sure that they're breaking (I can pick up stiff honor on my left this way, whereas low to the King works better in the much less likely case that LHO is void.)  Now I played a Spade back (maybe I can catch RHO napping and he'll duck.)

That line was not particularly successful.  LHO won the Spade and the defense cashed 2 Diamonds.  The Heart King was onside all along.  Maybe I should cash all the Clubs first and try to guess the position later.

+400 was worth 5/12th of the matchpoints (a little over 40%.)

LHO

A983 / K92 / QT52 / J5

RHO

T42 / 753 / AJ64 / T82