So, last board of the set of 16 against the Poles and we're up by 3 and change.  Nothing to write home about, but it's always nice to win a set against good opps, even if by less than an IMP.  So it's all on this board:

I pick up in 4th, favorable:

J85 / AQ76 / K9653 / 8

LHO bids 1 Spade, 2 Clubs from pard ...

before I have to decide what, if anything, to bid with this modest assortment, RHO comes in with 3 Clubs.

Apparently someone's bidding on zip and pip. 

So I pass and await developments and, as expected, Waldemar bids 3 Spades.  But Piotr surprises me by raising to 4.

I pieced together the evidence:

My partner overcalled 2 Clubs. 

The opponents are extremely aggressive bidders.

My partner overcalled 2 Clubs.

The opponents are red at IMPs.

My partner overcalled 2 Clubs.

It's the last board of the set.

So I smashed it.

I used to double a lot more than I do now.  Mainly that's a function of being more worried about looking foolish or not wanting to rattle partner than thinking that speculative doubles are a loser in the long run.  Many writers (such as Zia) have expounded on the virtues of the penalty double and how the IMP odds favor tight aggressive doubles (oh wait, no, that's poker strategy.)  But anyway, in this case I felt that by doubling partner was more likely to lead the ace if he had it and that if he had anything resembling a 2 Club overcall we had to be huge favorites to beat this at least a trick and maybe more (if clubs are 3-3, and pard has a quick entry, for instance).

That didn't make Waldemar's tank over the double any more comfortable for me, but he eventually passed.

Partner led the ace of clubs, like a champ, and dummy tracked:

K942 / JT54 / AJ7 / K4

Yikes!  Piotr had his bid.

Pard continued with Johnny club, and I ruffed.  Pard sure didn't have much for his 2 Club overcall.  Surely he has the king of hearts and not just a stiff heart (to be asking for a heart switch.)  So I led a low heart, pard won his King and led another club, ruffed high by Waldemar.

Waldemar played a low heart off the board and I fell from grace by playing my queen, and he ruffed.  He later got a diamond pitch from qxx on the ruffing heart finesse, but the pitch did him no good as the diamond hook was off.

Waldemar had

AQT763 / 3 / Q42 / Q52

Wow, that's AWFULLY close to a 4 Spade bid over 3 Clubs and I'd have dropped a blue card on the table in a heartbeat after pard continues to game over 3 Spades.  He did very well to take the conservative route both times (probably because of the death holding in clubs.)

That means pard held

- / K982 / T8 / AJT9763

(He must have been at least a LITTLE worried when I smashed this.)  He was probably never leading a diamond (on a heart lead I switch to a club and it's still down 1) anyway, but you never know.  I like to think my double steered him in the right direction.