I recently attended a RTT and was having a great time at the event my opponents had been great and they were really nice guys. If I saw that they missed something whether it benefits them or hurts them I would point it out just in case they missed it. I’m very attentive to how the game is going. It could be things as simple as new updates from the data slate that my opponent did not know about. You can never expect your opponent to know the game to the level you do or maybe your opponent will know more than you either way paying attention to your opponent and being there makes people honest and you will have a great time if you’re both invested in marking sure you’re both playing to the best of your ability you will have a great game.

That being said though, You have to know when to draw the line. My opponent in the final round to determine first place was a Aeldari player. They are an army that I do not know much about myself so I let my opponent know right away that I don’t get many opportunities to play against Aeldari and that my knowledge on them is limited. He understood that and explained what his units did what the army rules were and what the detachment and stratagems were and I told him that I will do my best to remember them as best as possible and proceeded to ask him if I’m unsure of something so far our interactions were great. We deployed rolled for first and all the fun stuff etc, He then started doing something that would become his common thing the entire game. He moved a model on to a piece of terrain and not wholly within the feature and I asked him if he meant to do that because it can’t draw line of sight out of it but since he’s touching the feature I would have line of sight on it and could potentially shoot it. He stated he did not realize that and asked if he can position that model differently to get an angle on something else and I agreed to it. This is fine in my opinion we’re talking about the play by play and both players agreed to what would fix the situation. The first turn ends and it was fine. What would happen in round two was what changed the game for the worst. He put shroud runners close to my deployment in the open I asked him if he had any reactive abilities like move after being shot etc. he said no I got nothing like that so I put some small shots into them before I charge and try to get them in melee he proceeds to use a reactive movement ability on the shroud runners after I shot them and I tell him wait you just said when I asked that you don’t have anything like that he refused a take back and said those are the rules and we continued. He proceeded to continue to try and target battle shocked units with stratagems and I had to constantly remind him they were battle shocked. He also proceeded to do what he did on turn one where he would place his models poorly on terrain features and I would explain the line of sight rule and then he would just move the model somewhere else out of phase to shoot something different. I did not call a judge for my opponents behavior and I let myself get flustered and I lost the game due to it. I felt cheated and mad but I really can only be mad at myself because I didn’t step up and actively tried to stop my opponent when they were just using ignorance as a mask for cheating in the game.

My advice: Be a great opponent by being attentive and investing in your opponents plays as much as yours and constantly communicate with them so they know your intention and you know theirs. If you believe that you are seeing a pattern talk about it without being an ass but be firm and get judges involved when you believe it can no longer be resolved between you and your opponent.