| Name: | Traditional | 2 |
Cohn | Allerton XX |
| Pass | To play | To play | To play | To play
or redouble with good 5/6 |
| NOTE | Some partnerships permit opener to scramble after responder's pass by bidding his suit, or redoubling for rescue, or redoubling to show both minors | |||
| Redbl | To play | To play | Stayman | To play |
| 2 |
To play | Balanced hand | To play | To play |
| 2 |
To play | To play | To play | To play |
| 2 |
To play | To play | To play | To play |
| 2 |
To play | To play | To play | To play |
| Name: | Minor ask | Krosky | Systems on | Guthrie |
| Pass | To play | To play | To play | 3+ Opener redoubles with 4+ |
| NOTE | Some partnerships permit opener to scramble after responder's pass by bidding his suit, or redoubling for rescue, or redoubling to show both minors | |||
| Redbl | To play | To play | ||
| 2 |
Stayman | |||
| 2 |
Transfer to |
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| 2 |
To play | Transfer to |
||
| 2 |
To play | As without dbl | ||
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