Children playing checkers.
The kids are competing in a tournament.
Playing checkers does not mean they are competing in a tournament.
exists e1 x1 x2 x3.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_play(e1) & n_checkers(x3) & (x1 = x2) & n_child(x1))
exists e1 x1 x2.(n_kid(x1) & in(e1,x2) & n_tournament(x2) & Actor(e1,x1) & v_compete(e1))