Takeout Doubles

Board 8
West Deals
None Vul
♠Q J 10 7
♥A K 9 7
♦A 9 5 3
♣4
♠A 9 5 2
♥J 4
♦K J
♣K 10 9 7 6
N
WE
S
♠8 6 4
♥6 5 3
♦Q 10 8 2
♣A Q 3
♠K 3
♥Q 10 8 2
♦7 6 4
♣J 8 5 2
WestNorthEastSouth
1♣Dbl1NT2♥
All pass   
2♥ by South

North's double promises support for all the unbid suits and an opening hand.
South, who would have bid 2 ♥ over partner's opening 1 ♥ bid, should therefore bid 2 ♥.
South should draw 3 rounds of trumps and set up spades remembering to play ♠ K first, to avoid being blocked.