The opener's double after an overcall

The opener rebids with a double
The opener's double can be:

a sputnik double with three cards in the responder's suit
a penalty double if the responder made a jump shift 2 over 1, or if the responder redoubled.

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Problem E1006 The opener's sputnik double.

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Problem E1013 A penalty double after the responder's jump shift 2 over 1.

The opener's sputnik double.
After his partner's response at the one level, the double is part of the sputnik family and shows:

a strong opening hand
three cards in the responder's major.

The redouble after the responder's sputnik double means the same if the opponents have a fit.

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Problem E1011 A sputnik double after the responder's bid at the one level. This shows a strong opening hand and three cards in the responder's major.

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Problem E6449 The opener's first double is a sputnik double because the opponents have a fit.

The opener's penalty double.
The opener's double is a penalty double when the bidding sequence clearly shows that their side has point majority and that the foolhardy opponents should be punished. This is the case when:

- the responder changed suit 2 over 1
- the responder redoubled. (10+HCP)

If his Partner makes a sputnik double and the opponents don't have a fit, the double is a penalty double (but if they have a fit it is a takeout double)

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Problem E1021 A penalty double when the responder redoubled.

After the responder's sputnik double, is the double a penalty double or a takeout double?

The opener's double is a takeout double if the opponents have a fit.
The opener's double is a penalty double if the opponents don't have a fit.

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Problem E4721 Your double cannot be a penalty double. The responder knows that the opponents have ten trumps. He will bid game in his best major.

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Detail specifications 44EZ - Level 2 ★

The opener's double after an overcall

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