(1y) 1NT
I suggest playing Gladiator at (1M) 1NT, which is more effective against a major suit opening, especially 1♠. Aggressor can have 5 hearts at (1♠) 1NT because 2♥ would be an underbid. We get an additional cuebid to invite with 3 hearts, roughly equivalent to Puppet Stayman. There is also an indirect 3NT for choice of games with 3 hearts.
This version of Gladiator originates from a BTU gadget.
(1♠) 1NT
| (1♠) 1NT - | |
|---|---|
| 2♣! | (R), Gladiator |
| 2♦♥ | INV, 5+# |
| 2♠! | STAY, INV+, 4=♥ |
| 2♠ - 3♠! | COG, e.g. MAX 3433 |
| 2NT! | NF INV, 5+♣ |
| 3x | FG, 5+# |
| 3♠! | SPL, 0–1♠, 4=♥ |
| 4♣♦! | Leaping Michaels, 5+♥, usually 5+# |
| 4♥ | S/O, 6+♥ |
| 4♠! | Leaping Michaels, 5+♦, 5+♣ |
| (1♠) 1NT - 2♣ - | |
|---|---|
| 2♦! | P/C |
| 2♥! | P/C, 5+♦ |
| 2♠! | MAX, 4=♥, 4+♦ |
| (1♠) 1NT - 2♣ - 2♦ - | |
|---|---|
| P | S/O, 5+♦ |
| 2♥ | S/O, 5+♥ |
| 2♠! | INV, 3=♥ |
| 2NT | BAL INV |
| 3♣ | S/O, 6+♣ |
| 3♦♥ | INV, 6+# |
| 3♠! | SPL, 0–1♠, 0–3♥ |
| 3NT! | COG, 3=♥ |
Slow 3NT still has 3=♥ if the right-hand opponent bids up to 2NT.
| (1♠) 1NT (2♣♦♥♠) | |
|---|---|
| 2NT! | TRF LEB |
| 3♣! | TRF INV+, 5+♦ |
| 3♦! | TRF INV+, 5+♥ |
| 3♥! | FG STAY, 4=♥ |
| 3♠! | SPL, 0–1♠, 4=♥ |
| (1♠) 1NT (2♣♦♥♠) 2NT - | |
|---|---|
| 3♣! | P/C |
| 3♣ - 3♠! | SPL, 0–1♠, 0–3♥ |
| 3♣ - 3NT! | COG, 3=♥ |
| 3♦! | P/C, 5+♣ |
| 3♥! | P/C, MAX, 4+♦, 4+♣ |
| (1♠) 1NT (2NT) - (3♠) - - | |
|---|---|
| X | PEN, 3=♥ |
| 3NT! | COG, 3=♥ |
I have not yet come up with how we utilize the slow cuebid.
(1♥) 1NT
| (1♥) 1NT - | |
|---|---|
| 2♣! | (R), Gladiator |
| 2♦♠ | INV, 5+# |
| 2♥! | STAY, INV+, 4=♠ |
| 2♥ - 3♥! | COG, e.g. MAX 4333 |
| 2NT! | NF INV, 5+♣ |
| 3x | FG, 5+# |
| 3♥! | SPL, 0–1♥, 4=♠ |
| 4♣♦! | Leaping Michaels, 5+♠, usually 5+# |
| 4♥! | Leaping Michaels, 5+♦, 5+♣ |
| 4♠ | S/O, 6+♠ |
| (1♥) 1NT - 2♣ - | |
|---|---|
| 2♦! | P/C |
| 2♥! | P/C, 5+♦ |
| 2♠! | P/C, MAX, 4=♠, 4+♦ |
| (1♥) 1NT - 2♣ - 2♦ - | |
|---|---|
| P | S/O, 5+♦ |
| 2♠! | S/O, 5+♠ |
| 2NT | BAL INV |
| 3♣ | S/O, 6+♣ |
| 3♦♠ | INV, 6+# |
| 3♥! | SPL, 0–1♥, 0–3♠ |
(1♣♦) 1NT
Otherwise, I suggest ignoring the minor suit opening. Take the 1NT overcall as a strong notrump opening.