Unbalanced 2♠

The 1♦-2♠ response shows an unbalanced invitation weary of 2NT. It promises either 4+♦ or 6+♣.

1♦-2♠-UNBAL INV
2NT!P/C, MIN 0–1♣
3♣!P/C, MIN 2–3♣
3♦!P/C, MIN 4+♣
3♥!FG, ask for ♠ stopper
3♠!FG, ask for ♥ stopper
3NTS/O

P-1♦-2♠

Passed hand has 2♣ for a club invitation, so 2♠ reduces to a limit raise.

P-1♦-2♠-LIM, 3+♦
2NTMIN, 4=♦
3♦S/O, 5+♦
3♣♥♠FG, 3+#