Two males are staring at a chessboard.
Playing chess are two men.
People staring at a chessboard are probably playing chess.
exists e1 x1 x2.(at(e1,x2) & n_chessboard(x2) & Actor(e1,x1) & v_stare(e1) & n_male(x1) & card_eq_2(x1))
exists e1 p1 x1.(exists x2.((x1 = x2) & n_man(x2) & card_eq_2(x2)) & n_chess(x1) & Actor(e1,x1) & v_play(e1))