In 2013, all the 180 students of a class played either chess, polo or tennis, or two out of these three games, or all the three games. 84 of them played chess, 87 played polo, and 87 played tennis. 39 played only polo and 16 played both chess and tennis but not polo. In 2014, a new football ground was opened and 20 new students were added to the class who played only football. All the previous students continued to play the same game(s) that they were playing in 2013. Some old students also started playing football and there were a total of 43 students who played football in 2014. None of the students played all the four games and none of the students played both chess and football. Of the 11 students who played both polo and tennis but not chess in 2013, 3 played football in 2014. 37 students played only tennis in 2014. 11 students played both polo and football and no other game in 2014. 37 students played both chess and polo in 2013.