Never a dull moment sitting down at a summertime terrace together with Simon. Just had a swim at the local pool and thought he was tired, but there he goes: Mom, I’ve got a game for you. Made these 9 cards and taught me how to play: each player grabs one card at a time and whoever has accumulated a valid sum or a set of three operators has won.
It was later that he showed me that the game is actually a number variant of tic tac toe and one should use the same strategy to get three in a row: