White, who does not want to exchange his Bishop for Knight, retires it, so
that he may play, should Black attack it (with 8. ... Kt to R 4), 9. B to B
2.
... 8. Q to K 2
In the Giuoco Piano it is not advisable for either player to castle early,
and Black wisely makes a waiting move. He is now able to castle on either
side, according to circumstances.