Hidden tic tac toe

The game is for two players. We start by taking out four sticks and using them to create a playing field.Each player takes one color of game stones. So everyone has three small, three medium and three large stones (cups). One of the players starts by placing one of their stones on the playing field. Small, medium or large stone, it doesn't matter. The other player does the same. However, if the opponent previously placed a small or medium stone, he does not have to place the stone in the new pla