TheChessMind wrote on 03/22/12 at 00:54:46:
I've never posted here before, but someone mentioned that there was a response here to one of my blog posts. I still wasn't going to reply, but as even my defenders didn't point out what I thought was the obvious answer it seemed reasonable to say something.
Quoting myself: "29...Rc8! A much better practical choice than the two moves the engine deems "better", for at least a couple of reasons."
What I didn't say is what F22 concludes; to wit, that 29...Rc8 30. fxe4 Bxg5 31. Qxg5 Kg7 32. Rf5 Rc1+ 33. Kg2 Qxg5+ 34. Rxg5 Bc6 - taken whole - is a better practical choice than 29. ... Bxg5 30. Qxg5 Kg7 31. Rf5 Qxg5+ 32. Rxg5 exf3. I'd agree that a comparison of those two lines is slightly (but not significantly) in favor of the latter, though both should wind up drawn without much sweat for 2600+ players.
So what's the difference between the two sets of claims? The answer is that while it's quite easy for White to get from 29...Bxg5 to the final position, which seems to me a fairly routine draw, it's not as easy to get from 29...Rc8 to safety - in fact, the 2674-rated Nielsen failed to do so, despite a huge advantage on the clock. It's not impossible to realize the need for 30.fxe4, but it's quite possible to miss it, as Nielsen did. As a result, Nyback had a winning position, though the game was eventually drawn anyway.
Maybe I'm wrong about the claim that 29...Rc8 (full stop) is a better practical choice than 29...Bxg5 (full stop), maybe not. As I often say on my blog, errare humanum est! But if I am mistaken, it's not in the way F22 suggested.
So to summarize:
1. Move A (B) leads to endgame EA (EB).
2. The path from B to EB has a lot of room for White making a mistake.
3. Therefore Black chose B.
My point was that one needs to compare the endgames EA & EB to really judge the two moves. We know EA is better for Black, but by how much? Initially I thought the difference was sizable.
At any rate thanks for posting in person.
fluffy wrote on 03/21/12 at 18:45:38:
typical cowardice from F22, insulting people from the safe haven of his anomymity.
I did not insult anyone.
fluffy wrote on 03/21/12 at 23:25:48:
it's just pointing out a possible error to try to embarrass the author. he could well have posted directly on the author's blog asking about it. he's so smart, he could do it without being anonymous all of the time too. F22 is anonymous because he's a you-know-what.
You can post anonymous comments on Dennis Monokroussos' blog as well. But what you can't do there, is post diagrams!
MNb wrote on 03/22/12 at 02:33:54:
Well, yes, that's why F22 is in my top three of my not worth answering list. You describe neatly my reaction the first time I read his post - actually about all his posts. So I did not even look at the two diagrams.
When I read it the second time (because of the first couple of reactions) it struck me that it does make sense to compare the two diagrams. Something this productive is highly exceptional for F22.
This doesn't contradict DM's kind reaction just above, nor does it change my opinion on F22, which is exactly the same as yours.
I am sorry you feel that way.
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