| Name: | Helvic Hayashi | Modified Helvic | Swine | Twisted Swine |
| Pass | Requires redbl | Requires redbl | Requires redbl | Requires redbl |
| Redbl | Forces 2 |
Forces 2 |
Forces 2 |
Forces 2 |
| 2 |
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| 2 |
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| 2 |
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| 2 |
Good | |||
| 2NT | Strong, unbalanced | Strong, unbalanced | ||
| After pass and opener's redouble: | ||||
| Pass | To play | To play | To play | To play |
| 2 |
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| 2 |
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| 2 |
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| After redouble and opener's 2 | ||||
| Pass | ||||
| 2 |
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| 2 |
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| 2 |
Poor | |||
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