Secret: Three-card riddle

This trick is called gambler's three cards. If you want to watch the video, Mr. Robin taught in Zhengda Variety Show, and Guo Andi also taught in Magic Mirror. If you surf the Internet on your mobile phone and I describe it in words, it's hard to make it clear, hehe. If you want to communicate, you can only communicate through QQ. You can search for teaching videos by typing the name "Three Cards of Gamblers" on the Internet.