Two men in black wetsuits surfing.
Two guys are playing chess
Ones can be either surfing or playing chess.
exists e1 s1 x1 x2 x3.(a_topic(x1) & Actor(e1,x3) & v_surf(e1) & (x1 = x3) & in(x1,x2) & n_wetsuit(x2) & a_black(s1) & Theme(s1,x2) & n_man(x1) & card_eq_2(x1))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_chess(x2) & n_guy(x1) & card_eq_2(x1))