Support double

In Contact bridge, the support double is a bridge convention used to distinguish between three-card and four-card support for partner's suit response to one's opening bid in the scenario where his response is either overcalled or doubled by the opponents. A call of two in partner's suit indicates four-card support and a call of double promises three-card support; if partner's suit bid is doubled instead of overcalled, a redouble serves the same meaning as double. The convention was invented by Eric Rodwell in 1974.

This keyword could refer to multiple things. Here are some suggestions: