Anyone that wants to attempt this legit, here's a somewhat recent guide from earlier this year that I found really easy to read and more importantly: effective.
Got me the solo on second attempt using his/her tactic, 12% 'wipe' on first due to some bad luck/mistakes on my part (my king was on 70% hp second attempt).
Karazhan Chess Event: A Soloing Guide - Tikari's Tricks of the Trade
This guide is NOT made by me. All credit goes to the original creator.