When I was about 10 years old my grandad offered to teach me to play cards. I wasn't much interested. Most card games were boring. An older person now, I realise what he was really offering was to teach me how to cheat at cards. I suspect that the reason he made the offer when I was ten was that he knew he was already losing the dexterity in his fingers necessary to manipulate the cards. He certainly knew his way his way around a pack of cards. He'd spent more than decade in the British Army between the world wars and soldiers played a lot of cards in those years. What he wanted me to learn would have set me up for life, providing I didn't get caught.