Problem A

Imps
East-West vulnerable
You, South, hold:

^*BWS: double = spades with diamond tolerance;
2 ♣, 2 ♥ are strong diamond raises

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:

What call do you make?

Problem D

Imps
Neither side vulnerable
You, South, hold:

^*BWS: 3 ♠ invitational

What call do you make?

Problem E

Matchpoints
North-South vulnerable
You, South, hold:

What call do you make?

Problem F

Matchpoints
Both sides vulnerable
You, South, hold:

^*BWS: three spades

What call do you make?

Problem G

Imps
North-South vulnerable
You, South, hold:

^*BWS: invitational

What call do you make?

Problem H

Imps
North-South vulnerable
You, South, hold:

^*two-plus clubs
^†spades
^§denies three-plus spades

What is your opening lead?