Two boys on opposing teams, blue and red versus purple and white, are chasing a soccer ball down the field while being watched by their other teammates.
two boys are rival soccer players
Being on opposing teams does not imply being rival soccer players.
exists e2 e3 e1 s1 s2 x1 x2 x3 x4 x5 x6 x7 x8 x9 x10 x11 x12.(-(x11 = x12) & n_teammate(x12) & n_teammate(x11) & of(x11,x10) & n_thing(x10) & n_field(x10) & while(e2,e3) & Actor(e3,x11) & Theme(e3,x1) & v_watch(e3) & down(e2,x10) & Theme(e2,x8) & Actor(e2,x1) & v_chase(e2) & n_ball(x8) & of(x8,x9) & n_soccer(x9) & Theme(e1,x3) & Actor(e1,x2) & v_oppose(e1) & rel(x3,x4) & n_white(x6) & n_purple(x5) & of(x5,x7) & n_versus(x7) & a_red(s2) & Theme(s2,x5) & a_blue(s1) & Theme(s1,x5) & subset_of(x6,x4) & subset_of(x5,x4) & n_team(x3) & (x1 = x2) & n_boy(x1) & card_eq_2(x1))
exists p1 x1.(exists s1 x2 x3.((x1 = x2) & n_player(x2) & of(x2,x3) & n_soccer(x3) & a_rival(s1) & Theme(s1,x2)) & n_boy(x1) & card_eq_2(x1))