次の例で CGEL が open conditional と remote conditional をどういう意味で使ってるか分かる。

Let us consider now the difference in interpretation between remote and open conditionals.
Further examples illustrating the contrast are given in:

OPEN
a. If he tells her she will be furious.

REMOTE
b. If he told her she would be furious.

OPEN
a. If you are under 18 you need parental approval.

REMOTE
b. If you were under 18 you would need parental approval.
(CGEL p.748)