[One Short]

♥

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North 1NT = 12-14
East X = Penalties
South 2♥ = Rescue transfer
North 2 ♠ = Transfer made
East X = Penalties


Is the final double by East alertable?

[ahydra]

Yes - either 2S is regarded as natural, in which case a penalty double is alertable; or 2S is regarded as artificial, and so the double is still alertable because it doesn't necessarily show spades / ask for a spade lead (East could be penalizing based on HCPs, for example).

ahydra

[campboy]

Yes, 2♠ is regarded as showing willingness to play in spades so double is alertable unless it is takeout.

Blue Book 4H5 said:

The following doubles must not be alerted:
[...]
(b) A take-out double of a transfer completion such as (1NT) pass (2♥) pass (2♠) dbl since this is deemed to show the suit bid.

[lamford]

One Short, on 2015-March-24, 04:57, said:

Is the final double by East alertable?

Not only is it alertable, but it is more commonly played as take-out at top level. And failure to alert could well damage South who might raise with six spades and get doubled a level higher.