Odwrotka 2♦
Odwrotka is an artificial game-forcing raise of 3+ card support. I propose two sets of responses to Odwrotka.
Reverse 445566
The simple 445566 structure is popular in Poland. I revert the strong and weak steps to prevent the weak hand from declaring notrump via bidding 2NT.
| 1♣ - 1M - 2♦ - | |
|---|---|
| 2♥! | S/T, 10+, 4=M |
| 2♠! | MIN, 7–10, 4=M |
| 2NT! | S/T, 10+, 5=M |
| 3♣! | MIN, 7–10, 5=M |
| 3♦! | S/T, 10+, 6+M |
| 3M | MIN, 7–9, 6+M |
Strong 2♥
I recommend the relay structure in Polish Club 2020: Expert. The 2♥ response to Odwrotka is the strongest step combining all slam tries. The relay structure generally lets the strong opener declare notrump.
| 1♣ - 1M - 2♦ - | |
|---|---|
| 2♥! | S/T, 10+ |
| 2♠! | NEG, 7–10, 4=M |
| 2NT! | MIN, 7–10, 5=M, not BAL |
| 3♣ | Mild S/T, 9–11, 5+♣, 4=M |
| 3♦ | Mild S/T, 9–11, 5+♦, 4=M |
| 3M! | MIN, 7–10, BAL 5=M |
| 3OM! | SPL, 7–9, 0–1#, 6+M |
| 3NT | MIN, 7–9, 6+M |
| 4♣! | SPL, 7–9, 0–1♣, 6+M |
| 4♦! | SPL, 7–9, 0–1♦, 6+M |
| 1♣ - 1M - 2♦ - 2♥ - | |
|---|---|
| 2♠! | (R), 3–5M |
| 2NT | NAT, 3=M |
| 3♣♦ | S/T, 5+# |
| 3M | NAT S/T, 4+# |
| 3NT! | BAL COG, 18–20, 4M333 |
| 1♣ - 1M - 2♦ - 2♥ - 2♠ - | |
|---|---|
| 2NT | 4=M |
| 3♣ | 4+♣, 5=M |
| 3♦ | 4+♦, 5=M |
| 3OM | 4+#, 5=M |
| 3M! | BAL 5=M |
| 3NT! | 6+M |
| 4♣! | SPL, 0–1♣, 6+M |
| 4♦! | SPL, 0–1♦, 6+M |
| 1♣ - 1M - 2♦ - 2♥ - 2♠ - 2NT - | |
|---|---|
| 3♣! | Ask for a side suit |
| 3♣ - 3x | 4+# |
| 3♣ - 3M! | 4+♣ |
| 3♣ - 3NT | 4M(333) |
Extension to 2♥
I designed rebids other than the 2♠ relay for more descriptive auctions.
| 1♣ - 1M - 2♦ - 2♥ - 2NT - | |
|---|---|
| 3♣ | 4+♣, 5+M |
| 3♦ | 4+♦, 5+M |
| 3OM | 4+#, 5+M |
| 3M | 5+M w/o side suit |
| 3NT | 4=M |