I dont agree with this Richie. My "badge" of NM certainly doesnt stop people using engines against me. I have been beaten by several ( about a dozen so far ) that were later banned for cheating. I think the opposite of you. A weaker player using an engine only some games is more likely to do so in tournaments and against much stronger players and/or titled players. To throw off suspicion they may then lose to much weaker players. I will go through my games archive just to see how many I have played that have been busted for "cheating".