The Second Negative gives opener no hope for slam, and he might be passed out if he repeats his first suit.
Partner You
♠ Α Κ 10 9 6 2 ♠ 5 4
♥ A K Q ♥ 8 4
♦ 7 4 ❏ ♦ J 9 8 6 5
♣ K Q ♣ J 6 4 3
Partner You
2♣ 2♦
2♠ 3♣
3♠ Pass
When partner just repeated his suit, he indicates a minimum hand – pass is just right for you. What if partner was stronger?
Partner You
♠ Α Κ Q J 6 2 ♠ 5 4
♥ A K Q ♥ 8 4
♦ 7 4 ❏ ♦ J 9 8 6 5
♣ K Q ♣ J 6 4 3
Partner You
2♣ 2♦
2♠ 3♣
4♠ Pass
Partner makes sure he is not passed short of game. If he is not as sure of the trump suit, he’ll bid a new suit which is forcing:
Partner You
♠ A Q J 10 9 6 ♠ 5 4
♥ A K Q 5 ♥ 8 4
♦ 7 ❏ ♦ J 9 8 6 5
♣ A K ♣ J 6 4 3
Partner You
2♣ 2♦
2♠ 3♣
3♥ 3♠
4♠
Your job, after the second negative bid, is to steer partner into the best trump suit. You prefer spades to hearts (partner bid spades first), so a simple preference is in order.