Lefthand opponent opens 1NT (15-17). Somewhat unfortunately, as it will turn out, we are playing Woolsey over this (a.k.a. Multi-Landy). Partner overcalls 2♦ showing "one major suit." RHO bids 2NT, alerted as lebensohl.
Okay, my bid. Seems pretty likely, at this point at least, that partner has spades. I have one spade. My hand is not particularly good, so I decide to pass. Opener completes the puppet to 3♣ and RHO bids 3♦ "to play." Nothing's really changed here, still seems like partner has to have spades, we might have a club fit (i.e. partner might have three opposite my six) but competing to the four level vulnerable on this hand seems like lunacy. So I pass, and 3♦ is the contract.
Here's the full hand:
Notice that we are cold for 4♥. The opponents can make three in either of their fits. RHO's choice to bid lebensohl and sign off in diamonds on his 6-5 hand is a bit off-center, but worked wonders on this hand.
I make the normal lead of my singleton spade. Partner can't read this as a singleton since it seems unbelievable declarer has FIVE spades, and ducks his ace. Declarer pitches a heart on the clubs and pulls trump, losing only the diamond ace and the spade ace for making five. Minus 150 is not a good matchpoint score.
So what do you think? Is this "just unlucky" or a good argument for natural overcalls on single-suited hands?

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