bluejak, on 2012-October-22, 19:00, said:
A double is alertable if it asks for a suit other than the suit doubled.
I cannot imagine how anyone thinks this applies in any way to a double of no-trumps.
Try this comparison: a tax law that says "A gift is taxable if it is made to a person other than the spouse of the giver". Would you say "I cannot imagine how anyone thinks this applies in any way to a gift made by somebody unmarried"? No, it obviously does apply also to unmarried people. If the giver has no spouse, then any person is "a person other than the spouse of the giver".
In a similar way, a natural reading of the sentence above is that if there is no suit doubled, then any suit is "a suit other than the suit doubled".