People playing a game in the pool.
There are people in a pool.
Playing a game in the pool implies being in a pool.
exists e1 x1 x2 x3 x4.(n_pool(x4) & a_topic(x1) & in(e1,x4) & Theme(e1,x3) & Actor(e1,x2) & v_play(e1) & n_game(x3) & (x1 = x2) & n_people(x1))
exists p1 x1 x2.(in(p1,x2) & n_pool(x2) & exists x3.((x1 = x3) & n_people(x3)))