Some people in shadow walk by an escalator.
The people are chess masters.
chess and escalator are different things
exists e1 x1 x2 x3 x4.(a_topic(x1) & Actor(e1,x4) & n_escalator(x4) & Theme(e1,x3) & v_walk(e1) & (x1 = x3) & in(x1,x2) & n_shadow(x2) & n_people(x1))
exists p1 x1.(n_people(x1) & exists s1 x2.((x1 = x2) & n_master(x2) & a_chess(s1) & Theme(s1,x2)))