@Thomas

:-) So, we patzers have opinions.
Yes, you could be right, in the end it's posible there is no win, but I think exactely what I wrote before. Natural seems to be trying. Of course black must be careful (though with no stress at all, I think), but praticaly she's the only one who can positively try something. And in her place, I would (except for those kind of posible "external" factors I mentioned).
And no, I think exactely the oposite of your "In any case" conclusion heheh.
Right, both types of cases depend on various factors but, as far as the information I have, and my opinion, the "Bok case" is far more common and understandable.

Just to add:

Maybe precisely because I'm such a great patzer is the reason I find that ending (still) so interesting and worth insisting!

@Castro: I am just a patzer, but I don't think black has serious winning chances after 67.-Qxb3 68.Qe4! with beautiful centralization. The f-pawn is going nowhere for the time being, and she actually has to be careful - f7 might fall, and then mating motives for white could appear. True, black can still bail out with perpetual check, but then why not do so right away?

In any case, playing a quick book draw with white seems "more odd" than saying "draw" to a long fighting game with black at some stage ... .

The abrupt end in Danielian-Ferro B. is somewhat frustrating. Black "must" go for Qxb3 and try to win, instead of repeating moves.
At least because, as for the position on the board only, black seems to risk nothing at all!
Of course one can understand maybe having a bad tournament so far, and a hard game so far against a very strong oponent are good reasons for Marta to call it a day there. (Also there can have been other reasons: Tiredness? Time pressure?)
If not considering these posible "extern" factors, this draw looks far more "odd" than any Bok-vanWely :-)

congratulations