EPITROPE

An epitrope is defined as, “a figure of rhetoric that consists in conceding something that can be disputed, in order to give more authority to what one wants to persuade” (Littré, Epitrope), see Concession.

Under ordinary conditions, as described by Grice’s principles, the arguer refutes everything possible, and concedes everything else. So, “Peter concedes P” pragmatically implies that Peter is unable to refute P. If the arguer concedes a doubtful proposition, he is considered a bad arguer; if he or she concedes something that is obviously refutable the speech is interpreted as ironic:

P is obviously wrong:
L: — P, okay, but / nevertheless Q

The embedding of P in a concessive structure, assigns P to the opponent, whether he  wants to endorse it or not:

About a writer whose stylistic qualities have just been discussed in a rather negative way:
I’m prepared to consider him a good stylist, but he doesn’t know what a plot is.

Irony can also arise from the exaggeration of the position granted:

I may have visions, but I also have some hard evidence.

S. Autophagy – Retribution; Irony; Exaggeration.