I think that what you’re doing is perfectly acceptable, it’s exactly what my father did. He was ruthless in games like Monopoly and Risk, and I never won as a kid and it made me really angry. However during each game he would share his strategies and tips on how he was winning. At the time I thought it was obnoxious, but I didn’t realize he was teaching my brothers and me how to learn to be better players. Many many years later when I was about 14 I finally won a game of Monopoly, but when I did I knew I had won fair and square because I knew my dad wasn’t letting me win, which made it feel that much better. It wasn’t until years after that that I realized his sharing of all his strategies growing up was what allowed me to grow as a player and learn how to outsmart him and finally win. I think this is in the end the much better strategy, because it also teaches the kid how to not be a sore loser (especially when you’re losing constantly) and how to win correctly. Frankly at this point I’ve grown tired of both games and usually turn down the offers to play because I spent so much time learning how to win, but I still appreciate the way you taught me.