An older guy is playing chess with a young boy.
A grandfather is teaching his grandson how to play chess.
Not all older guys playing chess with young boys are teaching them how to play. A young boy with an older guy is not necessarily his grandson.
exists e1 s1 s2 x1 x2 x3.(with(e1,x3) & n_boy(x3) & a_young(s2) & Theme(s2,x3) & Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_chess(x2) & n_guy(x1) & r_more(s1) & a_older(s1) & Theme(s1,x1))
exists e1 p1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_teach(e1) & Topic(x2,p1) & exists e2 x3.(Theme(e2,x3) & Actor(e2,x2) & v_play(e2) & n_chess(x3)) & n_grandson(x2) & of(x2,x1) & n_male(x1) & n_grandfather(x1))