South has a difficult decision. Open 1♠ or pass. 10HCPs, good shape, good intermediates and an easy rebid of 2♥. 

How strong is the south hand? Kaplan Hand Evaluator gives the 10HCPs as 11.25 so many will open 1♠ 

West will bid 2♦  (doubling to show ♥ s would risk when he rebids of showing a very strong hand with ♦ s)

North will probably bid 3♣ 

East cannot bid ♠ s, as bid by South so will pass.

With North's bidding a new suit at the the 3 level is forced to bid, so South will bid 3♥ to show his shape.

West will pass.

North has a choice.convert to 3♠  ( as South is showing 5+♠ s and 4+♥ s) or to take a punt at 3NT hoping that the Qxx♦ is a good enough stop. Both 3♠  and 3NT make. The winners being the duplicate bidder with 3N, but 3♠ should be good.

If South passes, it will go

West 1♦  North will bid 2♣ 

South has a choice to bid 2♠ (too weak) or pass.

Over the pass South will bid 2♠ 

West will bid 3♦ and North will either pass or take a risk with 3NT. If North passes South being maximum for the pass may bid 3♥ to show the shape of his hand and being maximum and North then has the question again convert to 3♠  or bid 3NT.

All in all a difficult hand to bid.

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