A surfer in a blue swimsuit is riding the waves.
A surfer is is competing in a tournament.
Just because someone is surfing does not always mean they are competing in a tournament.
exists e1 s1 x1 x2 x3.(n_wave(x3) & Theme(e1,x3) & Actor(e1,x1) & v_ride(e1) & in(x1,x2) & n_swimsuit(x2) & a_blue(s1) & Theme(s1,x2) & n_surfer(x1))
exists e1 e2 x1 x2 x3.(in(e2,x3) & n_tournament(x3) & Actor(e2,x1) & v_compete(e2) & Actor(e1,x2) & v_be(e1) & (x1 = x2) & n_surfer(x1))