possible to branch based on combination of two Responses?

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I'm trying to set up a study in which participants must 'pass' the training trials with a criterion accuracy score to continue. I'd like to branch to repeat training iff the initial training block score is too low. I get that I can use the "iterations": feature, which is cool. But the problem is that I need to compute the score based not on one response but based on two responses. This is necessary because, half the time, the answer "same" is correct and half the time "different" is correct, and the total score is a combination of the two.
Am I missing a simple solution here, such as coding same and different as a single response somehow?  Or combining two different triggers? Thanks for any suggestions!