BTU Stayman is characterized by including invitations of 5= spades. All its
variants are:
- Weak: T/O with short clubs (Garbage Stayman)
- Invitational: 4–5♠ or 4=♥ (BTU)
- Game-forcing: 4=♠ or 4=♥
| 1NT-2♣- | BTU STAY |
|---|
| 2♦! | 2–3♠, 2–3♥ |
| 2♥ | 4=♥, 2–3♠ |
| 2♠ | 4=♠, 2–3♥ |
| 2NT! | MIN, 44(xx) |
| 3♣! | MAX, 44(xx) |
- Smolen at both levels takes care of spade invitation.
- Second responses above 3NT remain the same, assuming misfit.
| 1NT-2♣-2♦- | NEG |
|---|
| 2♥! | TRF INV, 5+♠ |
| 2♠! | NF INV Smolen, 4=♠, 5+♥ |
| 2NT | NAT INV |
| 3♣ | FG, 5+♣ |
| 3♦ | FG, 5+♦ |
| 3♥! | FG, Smolen TRF, 54(xx) |
| 3♠! | FG, Smolen TRF, 45(xx) |
| 4♣! | Gerber BW |
| 4♦! | Texas TRF, 6+♥, 4=♠ |
| 4♥! | Texas TRF, 6+♠, 4=♥ |
| 4♠! | F QUANT |
| 4NT | QUANT INV to 6NT |
| 5NT | QUANT INV to 7NT |
| 1NT-2♣; 2♦-2♥- | INV, 5+♠ |
|---|
| 2♠ | MIN |
| 2NT | INV, 2=♠ |
| 3♣♦♥! | INV, xx in this suit, 3=♠ |
| 3♠ | INV, 3=♠ |
- BTU QUANT scheme remains, assuming misfit.
- 3♠ is a generic fit S/T, so 4NT is QUANT instead of RKCB.
| 1NT-2♣-2♥- | 4=♥, 2–3♠ |
|---|
| 2♠ | INV, 5+♠ |
| 2NT | INV, 0–3♥, 4=♠ |
| 3♣ | FG, 5+♣, 0–3♥, 4=♠ |
| 3♦ | FG, 5+♦, 0–3♥, 4=♠ |
| 3♥ | INV, 4+♥ |
| 3♠! | S/T, 4+♥ |
| 4♣♦! | S/T SPL, 0–1#, 4+♥ |
| 4♠! | F QUANT |
| 4NT | QUANT INV to 6NT |
| 5NT | QUANT INV to 7NT |
| 1NT-2♣; 2♥-2♠- | INV, 5+♠ |
|---|
| 2NT | INV, 2=♠ |
| 3♣♦♥! | INV, xx in this suit, 3=♠ |
| 3♠ | INV, 3=♠ |
- Only standard QUANT scheme remains. Now 4♠ is S/O.
- 3♥ is a generic fit S/T, so 4NT is QUANT instead of RKCB.
| 1NT-2♣-2♠- | 4=♠, 2–3♥ |
|---|
| 2NT | INV, 0–3♠, 4=♥ |
| 3♣ | FG, 5+♣, 0–3♠, 4=♥ |
| 3♦ | FG, 5+♦, 0–3♠, 4=♥ |
| 3♥! | S/T, 4+♠ |
| 3♠ | INV, 4+♠ |
| 4♣♦♥! | S/T SPL, 0–1#, 4+♠ |
| 4♠ | S/O, 4+♠ |
| 4NT | QUANT INV to 6NT |
| 5NT | QUANT INV to 7NT |