A young girl concentrating on a game of checkers.
The girl is watching a chess match.
A girl watching a game of chess cannot be concentrating on checkers.
exists e1 s1 x1 x2 x3 x4.(a_topic(x1) & on(e1,x3) & of(x3,x4) & n_checkers(x4) & n_game(x3) & Actor(e1,x2) & v_concentrate(e1) & (x1 = x2) & n_girl(x1) & a_young(s1) & Theme(s1,x1))
exists e1 x1 x2 x3.(n_girl(x1) & Theme(e1,x2) & Actor(e1,x1) & v_watch(e1) & n_match(x2) & of(x2,x3) & n_chess(x3))