| Name: | Moscow | Suction | Allerton | |
| Pass | Requires redbl | Requires redbl | Requires redbl | |
| Redbl | Forces 2 |
Forces 2 |
Forces 2 | |
| 2 |
Stayman | |||
| 2 |
Transfer to |
To play | ||
| 2 |
Transfer to |
To play | ||
| 2 |
As without X | To play | ||
| 2NT | Game forcing 2-suiter | |||
| 3suit | Pre-emptive | |||
| After pass and opener's redouble: | ||||
| Pass | To play | To play | To play | |
| 2 |
Bid suits upwards:
Any 2-suiter except |
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| 2 |
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| 2 |
4 |
4/5 | ||
| After redouble and opener's 2 | ||||
| Pass | ||||
| 2 |
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| 2 |
5 |
5 | ||
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