Duplicate - difficult hand on what level to bid to.

North will pass unless they play a Lucas 2 or play a weak 2 with 5+ cards when they bid 2♠ . Which puts pressure on East - who will probably double, but could try 2N.

If East doubles the 2♠ South will probably bid 4♠ (law of total tricks - if North actually had 6 rather than 5 or with only A and Ks on good side of doubler his hand becomes very strong.

If North passes, East can bid 1♥ and south will double (strong 11HCPs with values on right.

West will probably bid 2♥ though it fits well with strong suits and likely good shortages so 3♥ could be right.

North's hand is strong opposite the double so will certainly bid 3♠ which west with 15 HCPs will probably bid 4♥ s, though worried with K and Q and doubler to the left.

Then South has a difficult decision. If partner has invited via a jump suggests bidding 4♠ .

4♠ should make, so 4♥ would be a good result.