>astonishment and incredulity.
I think you have it right. *Incredulity* at a seeming blunder("?") plus *astonishment* when the move turns out not to be a blunder at all, nor even a clever though refutable trap("?!"), but actually is an irrefutable brilliancy("!!").
Shane Mage
"Thunderbolt steers all things...It consents and does not consent to be called Zeus."
Herakleitos of Ephesos