The Chess Mind

Author: Dennis Monokroussos.
This is a blog for chess fans by a chess fan who is more than a chess fan - other topics do creep in from time to time, per my interest.
All material here is copyrighted, and may not be reproduced without my prior permission.
Some games from round 1 of the 2007 World Cup
Here's what you'll find. From day 1, I've picked out three games that (a) reached tablebase positions, but (b) failed to conclude as they ought to. In Zhao Zong Yuan-Carlsen, White failed to hold a rook and pawn vs. rook and pawn ending, though it must be said that the drawing ideas were subtle. The game Inarkiev-Peralta was staggering: Black needed only give mate with bishop and knight against king - a task the average club player can cope with - but he "lost" (drew) on time, despite a 30-second increment! The third game, Galkin-Bartel, saw Galkin win with bishop and pawn against bishop when Black failed to hold a known theoretical ending. Chess is tough.

From day 2, we return to more positive chess. Three games with nice tactical sequences are featured: Ponomariov-El Gindy, Pridorzhini-Wang Yue, and Tkachiev-Balogh.

Day 3, on the other hand, returns to the bad - or perhaps more accurately, the bizarre. (Or the ugly, for those who like movie titles.) First up is the Short-Baramidze game, where Short lost despite starting the game with a time advantage of 25 minutes to 56 seconds. Ouch. We conclude with the second weirdest game of the tournament (I don't think Inarkiev-Peralta will be topped), Tomashevsky-Mamedov. In this game, Mamedov hung his queen in the most obvious way. It's probably not a blunder in the traditional sense, but some sort of psychological malfunction: maybe he thought he had played the moves in the opposite order, or a priori rejected his opponent's capture of the queen on the grounds that he had a zwischenzug gaining a rook. The only problem is that for something to count as an in-between move, there must be something both before and after relevant to the combination. The problem, as you'll see, is that the "after" part didn't exist!

Link.
Posted by Dennis Monokroussos on Tuesday November 27, 2007 at 1:46am
Anthony boron (mail):
Dennis,
Curious about your comments in the Mamedov game. How is it possible to have three successive novelties for Black ?
I could see the first and third (if the second move transposed to something), but how could the second move be a novelty if the first one was ? (or do White do the transposing ?)
11.28.2007 12:00am
Dennis Monokroussos:
Anthony,

It's unusual for that to happen, of course, but it's surprisingly easy. Here's a quick demonstration of how it's possible to have three (or indefinitely many novelties in a row). Games 1-3 are pre-existing games, and game 4 is a brand new one. As you can see, the first novelty in game 4 occurs when it varies from game 1 on move 1, the second novelty has it varying from game 2 on move 2, and the third, likewise, varies from game 3 on move 3.

Game 1: 1.d4 c5 2.Nf3 e6 etc.
Game 2. 1.Nf3 d6 2.d4 Nf6 etc.
Game 3: 1.e4 c5 2.Nf3 d6 3.d4 cxd4 etc.

Game 4: 1.d4 d6N 2.Nf3 c5N 3.e4 Nf6N etc.

Note also that a new move doesn't have to produce a new position, as can be seen from another entry:

Game 5: 1.d4 c5 2.Nf3 d6N etc.

Game 5 follows game 1 through White's second move, but while Black's second move varies from game 1, it also transposes to the position after White's second move in game 4.
11.28.2007 3:14am
Stig (mail):
Regarding Inarkiev-Peralta, aren't you being a bit kind to the average club player? I would think a majority of Class B-C players DON'T know the correct mating procedure in detail. Dvoretsky even comments in his Endgame Manual that a suprising number of strong players seeking his guidance had forgotten (or never learned) how to mate with N+B, so he had no choice but to include it. There are also GM precedents, I think Gufeld failed to win it once.
11.28.2007 1:28pm
Dennis Monokroussos:
Well, I did it in my very first tournament, knowing nothing more than that the king had to be dragged into a corner of the same color as my bishop (e.g. a8 or h1 for a light-squared bishop). My rating after that tournament was in the 1700s (Class B), so while that's a bit over the average, it's far from the ranks of professionaldom. There's only one trick one needs to know (or to figure out), assuming the defender plays perfectly, so there's no good reason for an experienced club player not to know it. In a blitz game or a tournament game with a sudden death time control, blowing it is comprehensible. But for a GM using 30-second increments, it should be a cakewalk. Anyway, given that Peralta didn't even get going, this was something else altogether - not a failure of knowledge but one of performance psychology (or perhaps just his bladder).
11.28.2007 1:39pm
Icepick (mail) (www):
Dennis, I've been playing for over 30 years, but I only learned how to mate with B+N about 12 months ago. OTOH, not only has this never come up in my personal experience (except in blitz games over the last 12 months when I've intentionally played for that mate), it's not even come close to coming up.

Oddly enough, I did have N+N vs lone pawn come up once. Fortunately, neither of us knew that a mate even existed. That was a LONG time ago.

The win I keep meaning to learn now is Q vs R, with best play for the weaker side.
11.28.2007 1:53pm
sbb1cpa (mail):
I am a 1200 and can mate with a B &N. It was in the Mammoth Book of Chess and I mated chessmaster and Fritz 8 several times. I haven't seen it in an OTB game. I find it hard to believe a GM would miss it.
11.29.2007 10:52pm