recognizing something you just played isn't cheating. and digging into why an answer is correct is good practice. if you play along, even if you have to cheat a bit in the beginning, you'll soon be identifying chords like a guitar sleuth.

don't worry about having the right answer... like everything at life, you gotta be willing to be bad at it if you want to get good at it. nobody's a chord master without trying, failing, trying, failing, trying...just keep playing along until you feel like you're stealing someone else's turn :-)