If you are the responder to 1 or 1, typically show the 4-card spade suit. You don’t want to miss a 4-4 fit, especially if opener happens to be unbalanced. So, respond 1 to 1 or 1 with: K1076 A32 Q76 432. If you are responding to 1, you should raise to 2 with 6-10 in support of hearts (ignore the spades). If you have more than 10, you can start with 1 and raise hearts next round. So, raise 1 to 2 with K654 K107 QJ2 654, but respond 1 with AQ76 A32 K32 765.
If responding to 1NT, tend not to use Stayman with 4-3-3-3 hands (just treat them as balanced notrump hands).
If partner responds to your 1 opening with 1, don’t show the spades with a balanced hand (this is the modern "Walsh" style). Rebid 1NT with 12-14 balanced and 2NT with 18-19 balanced. When partner responds 1, he either won’t have 4 spades, or it is his job to show them later. So, rebid 1N after 1-1 with QJ76 KJ7 KJ4 K32 and rebid 2N with KJ76 KJ7 KJ4 AK2.
If partner responds 1 to your minor opening, he could easily be 4-4 in the majors. His job is to respond up the line with 4-4. With 12-14, show your spades so you won’t miss a 4-4 fit. But, with 18-19, jump to 2NT (partner can look for a 4-4 spade fit on his way to 3NT). Accordingly, rebid 1 after 1-1 with: AJ76 KJ7 1087 A32, but rebid 2N with KJ76 KJ7 KJ4 AK2.
As responder, ignore 4 spades only when you have to raise 1 to 2 instead. Ignore 4-card majors with 4-3-3-3 when responding to 1NT. As opener, ignore 4 spades after a 1 response or if you have 18-19. This all takes some getting used to.
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What is your response to partner's 1 opening if you hold:
AJ76
KQ2
765
AQ2?
1
2NT
3NT
Other
What is your response to partner's 1 opening if you hold:
Q1076
K43
654
A32?
1
1NT
2
Other
What is your response to partner's 1 opening if you hold:
AQ76
J76
A32
542?
1
1NT
2
3
Other
As opener, what is your rebid after 1-1 with:
AJ65
A65
KJ5
KQ10?
1
2
2NT
3NT
Other
As opener, what is your rebid after 1-1 if you hold:
KQ76
KJ3
K65
J65?
1
1NT
2
Other
Playing matchpoints. As opener, what is your rebid after 1-1 if you hold:
KJ43
AK2
KQ3
Q32?
2
2NT
3
4
4NT
As opener, what is your rebid after 1NT-2 if you hold:
Q987
KJ4
KQ4
AJ8?
2
2
2NT
3NT