If we are to exchange Queens, I want it to be on my terms, not his. To be more specific, I don't want his c-pawn migrating to d4, which would have happened after smth like 20. Ra(h)f1 Qd4+ 21. Qxd4 cxd4+.

The g-pawn should be untouchable from a commonsense standpoint, but I think I actually win by force if he grabs it because then I go Rh(a)g1, Rxg7+, Rg1+ and Qg5+, threatening both Qg7# and Qf6+. Anyway, he is obviously not gonna grab on g2 :/

If he plays 20. ...Qf6+, I plan to play Kb3, and I think my King will be reasonably safe on b3 (and eventually a3). My prediction is 20. ...Qxe3+ after which I hope to be able to prove that my piece is worth more than his three pawns.

I've been pretty bad at guessing his moves so far, though (Qf5+, 0-0 and c5 were all surprises to me - especially Qf5+ so I wouldn't be surprised if he found a move I hadn't even considered.

This is not the first time his move surprises me (see 16. ...Qf5+, for example) but in this instance, I do not even understand what is he trying to do.