Problem A

Imps
East-West vulnerable
You, South, hold:

What call do you make?

Problem B

Imps
Neither side vulnerable
You, South, hold:

What call do you make?

Problem C

Imps
Neither side vulnerable
You, South, hold:

^*BWS: double = cooperative-takeout

What call do you make?

Problem D

Imps
Both sides vulnerable
You, South, hold:

^*BWS: Birthright applies; game-force; hearts with secondary spades
^†BWS: four of a minor ostensibly natural

What call do you make?

Problem E

Matchpoints
East-West vulnerable
You, South, hold:

What call do you make?

Problem F

Matchpoints
Both sides vulnerable
You, South, hold:

^*BWS: 2 ♦ forcing to 2 ♠; double shows four hearts

What call do you make?

Problem G

Matchpoints
North-South vulnerable
You, South, hold:

^*BWS: invitational

What call do you make?

Problem H

Imps
East-West vulnerable
You, South, hold:

What is your opening lead?