Coins on a Chessboard

There is a room with a chessboard inside. On each of its 64 squares there is placed a coin, either heads up or heads down. You enter the room and a person inside points towards one special square on the chessboard and gives you the chance to flip one of the coins (whichever you choose). Then you leave the room, your friend enters and has to guess which was the special square on the chessboard. If you two could devise a plan before entering the room, how would you make sure your friend always guesses correctly which is the special square?

Coming soon.


Vincent Bal is a Belgian writer and director. Apart from making movies, he is also famous for his art project Shadowology which combines everyday items, their shadows, and doodles, into one amazing collection of cartoons. If you want to see more of Vincent, you can follow him on Instagram, where he regularly posts new work.