Equal-Level Conversion Doubles

The double you couldn’t otherwise make

Normally, doubling for takeout and then pulling partner’s response to a new suit shows extra strength — a hand too good for a simple overcall. That standard rule makes a takeout double impossible on some perfectly ordinary shapes.

The convention

Before converting, BidMaestro looks for all of:

At most two cards in opener’s major: A proper takeout shortage in the suit they opened.
Four or more of the other major: A real holding — good enough that you want partner to bid it.
Five or more diamonds: A sound suit, worth an overcall of two diamonds on its own.
No more than two clubs: Clubs is the one reply you least want to hear — which is exactly why the escape to diamonds matters.

The cost

Because the same-level 2♦ conversion is defined as this no-extras shape, it can no longer show a strong, single-suited diamond hand. A hand with extra values has to show them another way.

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