Changing individual constraints, here: the attentional focus. Focusing on the next point can be difficult. This game can help players to focus only on the next point. Each player is given a set of playing cards und turns over the top card without showing it to the other player. Whatever the number on the card is, that is the number of points required to win the match. The partner does the same. Neither side informs the opponent until the winning point has been scored. (found in Jia Yi Chow et al. Nonlinear pedagogy in skill acquisation, p 157)