Takeout Doubles

Board 4
West Deals
Both Vul
♠A 5 3
♥K 9 7 5
♦10 5
♣A J 6 3
♠K 4
♥A J
♦K J 9 4 2
♣Q 7 5 2
N
WE
S
♠8 6
♥Q 10 6 4 2
♦A 8 6 3
♣8 4
♠Q J 10 9 7 2
♥8 3
♦Q 7
♣K 10 9
WestNorthEastSouth
1♦Dbl1♥2♠
All pass   

With 6 spades and 8 HCP, South has enough to invite game, so bids 2 ♠. North is minimum and declines the invitation.
Lead is ♦ 2 from the longest and strongest suit. Declarer draws trumps and plays West, the opener, for the ♣ Q. Therefore play the ♣ K then ♣ 10 and let it run if West
does not cover with the Q♣.