@jkarp, idj is talking about a computer.

jkarp, e5 would be a very strong move for White. It is absolutely the most important thing for Black to worry about here, because it would give White a very strong push through the center, backed up by his whole army.

@jkarp: I don't know which e.p. capture you are talking about, but after 22.e4-e5 (from White!) there's no e.p. capture.

@jkarp: in this case I mean convert into a win. (Which is easier said than done of course..)

@jkarp: read my comment again, 25.exd5 and if 25...Qa7, 26.Ra1 keeps his pawn.

@jkarp: that was not possible yet because the a4 pawn was in the way.

Wow, that's a really nice combination (and *really* tough to see!)

Sample line for the mating attack: 31.g4 g5 (to stop 32.g5#) 32.fxg5+ Kxg5 33.h4+! Kg6 (33...Kxh4 34.Bf6#) 34.Qd3+ f5 (34...Kh6 35.Qd2+ Kg6 36.Qg5#) 35.Qxf5+ Kh6 36.Qg5#.

In this stadium I could have taken more time to watch the possibilities then I did during the game. But somehow I didn't.

@paulschesspalace: I think we were both feeling time pressure coming up because we had some 15-20 minutes left so we played quite fast, but it was faster than necessary since we soon got into a queen ending which was quite easy to play and calculate.

@jkarp: true but I have also taken a rook, so it's an even trade. However, with 30...Qxc4 31.Bxf6+ Kf7 32.Rxa8 Qxd5 I could have got an extra pawn for it.

A draw offer would have been excepted. But for me it's dangerous to spend energy in offering a draw which might be declined. Focussing on the game until it was a clear draw was my priority.

@jkarp: if one player keeps checking the other and the moves are repeated, it's a perpetual check. It's actually a specific form of a threefold repetition.