1 One no trump. You have a balanced hand with 17 high-card points and all suits protected. There is very little to be gained by overapproaching with a bid of one diamond. Observe what an awkward situation you would have built up for yourself if partner responds with one spade or one heart. Your hand is much too good for a rebid of one no trump yet not good enough for a jump rebid. This awkward problem should be circumvented by an opening bid of one no trump, a "savior" of most 17-point hands.
2 Two no trump. This hand falls a shade short of the requirements for a demand bid. However, it does contain 22 high-card points with protection in all suits and therefore qualifies as an opening bid of two no trump. You should not be deterred from making the best call merely because you have a five-card major suit.
3 Two clubs. This hand contains the elements of a raise to three no trump. However, since it may play better at a suit contract, the two-club convention should be employed to determine whether partner happens to have reasonably good spades.
4 Three hearts. You have a good major suit and enough to insist on a game contract. You will, of course, pass if partner bids three no trump. There is no reason to employ the two-club convention with this holding.
5 Three diamonds. Your bid is forcing to game. You have the high-card requirements to justify a game effort (10 points), but you should give yourself a chance to play at a suit.
6 In this case you have a choice. A raise to two no trump is entirely acceptable because the hand contains eight high-card points. However, it might be advantageous to respond with the artificial bid of two clubs because it is quite possible that the hand might play better at spades and you should not give up the opportunity to show that suit at the proper time. If over your two-club bid partner's rebid is two diamonds denying a four-card major suit, you will show your spade suit; similarly, if he rebids two hearts you will bid two spades. It should be pointed out that your bid of two spades in this sequence is not forcing. If partner has a rock-bottom minimum he may exercise the option to pass, but he may also raise spades or even go on with no trump.
7 Two hearts, denoting a weak hand and requesting partner to pass. Observe that if you had a better hand and wished to show the hearts you would first resort to the artificial bid of two clubs. A response to the opening no trump of two diamonds, two hearts or two spades is a request to the opening bidder to pass.
8 Two diamonds. This response is automatic when you have no biddable major. If partner now bids a major, you can raise him or rebid no trump.
9 Pass. Any response of two in a suit other than two clubs shows weakness and requests opener to pass. You have a minimum no trump with even distribution and so have no basis for further action.
10 Pass. A four no-trump bid in this sequence is not a request for aces. It is a quantitative raise in no trump. In other words, partner announces that his hand is too good for a raise to three no trump. His bid shows 15 or 16 high-card points and a balanced distribution and requests you to bid a slam if you have a maximum no trump. Actually, you have a 16-point minimum.