A double made with the intention of increasing the penalty points scored by a partnership if they defeat their opponents' contract. Often contrasted with take-out double.
- S.J. Simon suggested that a double of a low-level overcall be a proposal to partner, a tentative business double, no more a command that opener pass than a new-suit response is a command that opener play in responder's suit.
- Tentative business doubles, as explained by Simon and Miles, were a significant improvement upon Colonel Blimp Doubles, but they suffered from two defects.
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