The convention Extended acceptance after NT can be used after partner 1NT/2NT (NT style) and Jacoby transfers.

1N-2♦

?

2♠ - 4+♥, 2♠

3♣ - 4+♥, 2♣

3♦ - 4+♥, 2♦

1N-2♥

?

3♣ - 4+♠, 2♣

3♦ - 4+♠, 2♦

3♥ - 4+♠, 2♥

2N-3♦

?

3♠ - 4+♥, 2♠

4♣ - 4+♥, 2♣

4♦ - 4+♥, 2♦

2N-3♥

?

4♣ - 4+♠, 2♣

4♦ - 4+♠, 2♦

4♥ - 4+♠, 2♥