Extremely counterfactual mugging is the simplest such variation IMO. Though it has the same structure as Parfit’s Hitchhiker, it’s better because issues of trust and keeping promises don’t come into it. Here it is:
Omega will either award you $1000 or ask you to pay him $100. He will award you $1000 if he predicts you would pay him if he asked. He will ask you to pay him $100 if he predicts you wouldn’t pay him if he asked.
Extremely counterfactual mugging is the simplest such variation IMO. Though it has the same structure as Parfit’s Hitchhiker, it’s better because issues of trust and keeping promises don’t come into it. Here it is: