Pentago is a board game and you can think of it as a highly advanced version of tic-tac-toe. With the aid of supercomputers, it has been strongly solved. Just like tic-tac-toe, it is possible for the player who starts first to always in. I'm looking for a formula to always win at Pentago if I'm the first player. For tic-tac-toe, always mark the central square. For Pentago, never touch the 4 corners. Tic-tac-toe is simple enough, but what is a formula for Pentago that can be applied by humans anytime? Just like once someone memorises the algorithm, he can solve any Rubik's cube problem.