Both sides vulnerable at matchpoints, South opened one spade. West, my partner, overcalled with two clubs. North passed, and I was sitting East with ♠ J854 ♡ AT97 ♢ A843 ♣ 4.
I had no obvious bid, so I passed and so did South.
Partner was unhappy because we made five clubs (and could have made 3NT). But I was entitled to assume only a six card club suit and 12 HCPs in his hand. Had I bid one of my four card suits, we would have had (at best) a "Moysian" 4-3 fit in hearts, versus a 6-1 seven card fit in clubs. And I felt 2NT would have been a stretch.
partner had substantially more strength than expected: 15 HCPs, a singleton diamond, and a semi-solid club sequence. He also had KQJ in hearts, which might be worth more in sequence than their nominal six points. With that, would he have done better to double and then overcall clubs even though his 3-3-1-6 distribution was "wrong"?
Put another way, did I underbid over the call he actually made (rather than the one he might have made)?