The children are playing a game of checkers.
Kids play a boardgame
Checkers is a boardgame.
exists e1 x1 x2 x3.(n_child(x1) & Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & of(x2,x3) & n_checkers(x3) & n_game(x2))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_boardgame(x2) & n_kid(x1))