Shift+C For YR
Ctrl+C for RA2

Take a screenshot(SS) with his name on it by getting him to speak, take the SS when his name appears.

Also helpful:

A copy of mpstats.txt from you RA2/YR directory (RIGHT AFTER playing the cheater)

A SS of the end-of-game screen, where it shows who had how many kills/losses/builds.

meselfs himself!