Shakmaty Bereolos - The Official Chess Site of Peter Bereolos

Games versus GMs

Welcome to my chess page. This is mostly random thoughts and analysis in the form of a chess diary with other sections of the site slowly developing. A lot of the content will come from my own experience. There are two reasons for this. One, so I can use this site as a self-improvement tool. Two, so you the readers will have content that is not found on other chess sites. Follow the link to the left to reach my annotated games against grandmasters. Send me comments and ideas

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Pete

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11/14/18 - BCE-41

I was cleaning up the archives I noticed that there were some positions from my original review of the Benko edition of BCE that I had not added on the BCE page. One of these is the pawn ending, Position #41, where Black has an active king and can either seize the opposition or engineer a pawn trade to a drawn ending.

Like BCE-69, the analysis seems to have been handed down from van der Lasa to Berger to Fine (although in van der Lasa it is the mirror image position on the queenside. In this case, Muller and Lamprecht cite Georgiev as correcting the analysis in 1925. News travelled slower in those days, but you would think that it would have been known by 1941 when BCE was published. Certainly, there was no excuse for this one to have been missed in the Benko edition.


11/7/18 - BCE-69

This week's BCE post is another pawn ending. BCE-69 is another position where the historical research was more interesting than the moves on the board. In this basic 4 vs. 3 king and pawn ending White should slowly push the Black king back, then create a passed pawn and win. Fine gives several variations to show that Black can't defend, but in one of them, he plays a tempo move too early allowing Black an opportunity to draw.

Fine references Berger as the source of the position. Position 523 in Berger is the BCE position except that it is White to play and the king is on c1 instead of d2. Fine seems to have copied Berger's variation with the exception that on Black's incorrect 6th move, he corrects Berger's typo ..Kd5-e5, which is impossible since the king is already on e5.

The origin of the position goes even further back since Berger cites van der Lasa as his source. Looking at that analysis we see a different variation.

1.Kd2 this is the BCE starting position 1...c5 2. dxc5 bxc5 3. b3 Here Berger and Fine both continue 3...a6, where van der Lasa's line goes 3...Ke5 4. Ke3 Kd5 5. Kd3 a6 6. a3 a5 7. a4by transposition all three references have reached this position, but only van der Lasa's move order avoids the drawing possibility present in Berger/Fine. It is curious that Berger changed the move order.


11/5/18 - Gregorz-Bereolos, 2016 Kings Island Open

One variation in the endgame I played against Ralph Gregorz in the 2016 Kings Island Open bears some resemblance to the Flohr-Ragozin ending. After letting a big advantage slip away in a major piece ending, I had a long thought in the position after 42.a5 and decided to go for the pawn ending.

42...Rd6 43.Rxd6 Kxd6 44.b5 the other try is 44.Kd3 when a) 44...g5? 45.g4! cripples Black's kingside; b) 44...h6? 45.b5! (45.Kd4? Kc6 46.Kc4 f4) 45...Kc5 46.a6! bxa6 47.bxa6! Kb6 48.f4! Kxa6 49.Kd4! also wins for White; c) 44...Kd5? 45.f4! h6 46.b5! g5 47.a6 bxa6 48.bxa6! Kc6 49.g4 is a decisive breakthrough; only 44...Kc6! holds the draw 45.Kc4 f4 46.g4 h5! 47.gxh5 gxh5! 48.b5+ Kd6! 49.Kd3 h4! 50.Ke2 Kc5! 51.a6! bxa6 52.bxa6! Kb6! 53.Kf2 Kxa6! 54.Kg2! Kb5 55.Kh3! Kc4 56.Kxh4! Kd4 57.Kg5 Ke5! 58.Kg4 Ke6! 59.Kxf4 Kf6! with the opposition 44...Kc5 45.a6! bxa6 46.bxa6! Kb6! 47.Ke3 Kxa6 47...g5 48.g4 (48.f4? g4 49.Kd4 h5-+; 48.Kd4? h5-+) 48...fxg4 49.fxg4 Kxa6 50.Ke4 Kb5 51.Kf5 Kc5 52.Kxg5 Kd5 53.Kh6 Ke5= 48.Kf4 Kb5 49.Kg5 Kc5 50.Kh6 f4!

51.Kxh7? he grabbed the pawn, immediately realized what he had done, and resigned 51.gxf4 Kd4 52.Kxh7 Ke3! is the position that is similar to Flohr-Ragozin 53.Kxg6 Kxf4! 54.Kf6 Kxf3= 0-1

Lessons from this ending: 1. Trust your calculations. 2. It ain't over 'til it's over.


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