Actually the line you (and engines) give after 27.Qxc4 Nf3, culminating in 36.-b3 "there's no good answer to ...Ba3, and the b-pawn promotes" continues. The b-pawn doesn't promote but black is still winning: 37.Nf6 Ba3 38.Nd7 Bxb2 39.Nc5 - white is just in time to stop the b-pawn but 39.-Bxd4 40.Nxb3 Bxf2. And this - two connected passers for black - is of course resignable.
Not to "correct" you, I just wonder whether there is any "logic" to black winning in such a way, made possible by three white pawns (b2, d4, f2) on dark squares. Who would predict the game to end like this?
I don't think I saw that particular line (about which: White could also play 38.Ne4, with the option to go to c5 or d2 after 38...Bxb2 - it's the same thing, of course), but did see that there were other ways to stop promotion (I *think* the line I considered was something like 37.Kg2 Ba3 38.Nxf4 Bxb2 39.Nd3). That's why I said that there was no *good* answer, but had I spotted your line I would have included it. Good catch.
Actually the line you (and engines) give after 27.Qxc4 Nf3, culminating in 36.-b3 "there's no good answer to ...Ba3, and the b-pawn promotes" continues. The b-pawn doesn't promote but black is still winning: 37.Nf6 Ba3 38.Nd7 Bxb2 39.Nc5 - white is just in time to stop the b-pawn but 39.-Bxd4 40.Nxb3 Bxf2. And this - two connected passers for black - is of course resignable.
Not to "correct" you, I just wonder whether there is any "logic" to black winning in such a way, made possible by three white pawns (b2, d4, f2) on dark squares. Who would predict the game to end like this?
I don't think I saw that particular line (about which: White could also play 38.Ne4, with the option to go to c5 or d2 after 38...Bxb2 - it's the same thing, of course), but did see that there were other ways to stop promotion (I *think* the line I considered was something like 37.Kg2 Ba3 38.Nxf4 Bxb2 39.Nd3). That's why I said that there was no *good* answer, but had I spotted your line I would have included it. Good catch.