EmperorsBridgeNotes/Doubles

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[Main] / [Opening] / [Overcalls] / [Replying] / [Rebidding] / [Doubles] / [Later Bids] / [Slamming]

Takeout double needs about 13 points, shortage in the opponents suit.

Double then bid suggests more like 17+ points
Double then jump suggests a killer 21+ point hand

A takeout double is forcing unless you are very strong in the bid suit:

pass [!!] 8+ points, good in trumps, requesting trump lead
suit - your best suit
jump-suit - 8+ points
1NT - 8-11, stop in bid suit
2NT - 12-13, stop in bid suit
3NT - 14+, stop in bid suit

A low-level double when the doubler's partner has passed is nearly always a takeout.

A double of a suit call below the four level is for takeout when made at the player's first opportunity of doubling, providing that the doubler's partner has not bid

NT doubles are always penalty
doubles of suit escapes from doubled NT are always penalty
doubles of openings up to 3[suit] are usually takeouts
doubles of overcalls up to 2S are usually takeouts