Matchpoints. You are in 4th chair and have to decide whether to open this hand. You are playing standard 2/1 GF (strong NT). Your general opening style is guided (usually) by Rule of 20, thus partner can pass 4333 12 counts or 4432 11 counts, etc. Feel free to comment on what change(s) would make you change your mind (vulnerability, form of scoring, opening bid style, hand itself, etc.
Plus... it's free!