24 February 2020

Rook Ending Tragicomedy

The third rook ending in Thomas Engqvist, 300 Most Important Chess Positions (2018) sent me back into my database. There I found a game that went from winning to drawn to losing, and then I won on time when my opponent had a forced checkmate in three. It was a blitz game, and likely we were both seriously short on time.

White to move

Stripes,J. (1618) -- Internet Opponent (1573) [E91]
freechess.org, 08.01.2006

55.Kh1 Rf2 56.Rf8+ Kg3 57.Rxf2??

Throws away the game.

Black to move

57...exf2??

57.Kxf2=

58.Rf1??=

58.Rb3+-

58...Kf3

White to move

59.Kh2??-+

59.Ra1=

59...g3+ 60.Kh1 g2+ 1-0

Black lost on time.

Analysis Positions


White to move
White should win easily, but 56.Ra3?? allows Black a draw.

Black to move
Black has a draw.

Black to move
Black has a draw.

Black to move
Not 61...gxf1Q=

22 February 2020

Rook vs. Pawn

The first rook ending in Thomas Engqvist, 300 Most Important Chess Positions (2018) is from a game that he won because his opponent did not know how to draw. I had an almost identical position in a blitz game twenty years ago with the same result.

White to move

57.Kb7??

57.Kd8 draws

57...Kd6 58.Ka7 Ra1+ 59.Kb8 Kc6 60.b7 Rb1 61.Kc8

61.Ka8 was worth a try, even though it leads to a faster checkmate. Maybe my opponent was hoping I could not checkmate with the rook in the time remaining.

61...Rxb7

Further exploration of my database revealed another instructive rook ending that should have been drawn. After my opponent's blunder, my play was near perfect.

White to move

47.e5??

47.Ke5=;
47.Kf5 a2 48.Ra7+ Ke8 49.Ke6 Kd8 50.Ra8+ Kc7 51.e5=

47...a2 48.Ra7+ Ke6 49.Ra6+

Black to move

49...Ke7

49...Kd7 is slightly better.

50.Ra7+ Kd8 51.Ra8+ Kc7 52.Ra7+ Kb6 53.Ra3

Black to move

53...Rf1+ 54.Kg5 a1Q 55.Rxa1 Rxa1 56.e6 Re1

56...Kc5 also wins

57.e7

57.Kf6 Kc5 still wins 58.e7 Kd6

57...Rxe7 White resigns 0-1

The second rook ending in Engqvist's book is a gem from Richard Reti.

White to move

Can you win with White?

13 February 2020

Dancing Knight

The first problem in the Basic Test in Jesus de la Villa, 100 Endgames You Must Know, 4th ed. (2015) inspired my search for instructive positions with which to build a lesson for my students this week. Naturally, a few games in Chess Informant gave me what I needed. These are the positions in the sequence I used.

Black to move
From Van Wely,L -- Epishen,V, Ter Apel 1995, Informant 63/437

Black to move
Variation from the previous exercise.

Black to move
From Bronstein,D. -- Podgaets, M., Soviet Championship 1974, Informant 18/646

Black to move
My composition

White to move
From de la Villa's test. Can White draw?

White to move
From da la Villa's test. Can White draw?

White to move
From Eingorn,V. -- Beliavsky,A., Soviet Championship 1986, Informant 41/555

White to move
From Varga,Z. -- Dinev,D., Novi Sad 2016, Informant 130 Endings.

23 January 2020

Facing the Breyer

Blitz can be useful for testing openings and finding new ways to play in tournaments. This morning, I opted to play the Spanish Opening. Of course, this choice was motivated by my current slow reading of Paul Keres, World Chess Championship 1948 (2016 [1949]), which has me studying a couple of lines in this opening.

Even though I have played both sides of this opening in tournament play, it is not my normal opening on either side of the board. Consequently, my experience against the Breyer variation is quite limited. This morning, an online opponent deployed it against me in a three minute game. A few moves later, I seemed to lose the thread of the game and gave up a pawn.

Somehow, I got the material back and could have exchanged into a an equal double rook endgame. I kept the queens on the board, and lost. These annotations were made quickly--almost as fact as the game. No engine was used. I did use an opening book: PowerBase 2016 (it may be time to buy a more recent version).

Stripes,J (1952) -- Internet Opponent (2096) [C95]
Live Chess Chess.com, 23.01.2020

1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.0-0 Be7 6.Re1 b5 7.Bb3 d6 8.c3 0-0 9.h3 Nb8

Black expends some tempi to bring the knight to a better square. This maneuver is the characteristic feature of the Breyer variation of the Spanish.

White to move

10.d4 Nbd7 11.Nbd2 Bb7 12.d5

12.Bc2 is the main line

12...c6

White to move

13.c4

13.dxc6 looks better Bxc6 14.Bc2

13...bxc4 14.Bxc4?

14.dxc6 looks better here, as well. The move I played dropped a pawn. 14...cxb3 15.cxb7 Rb8 16.Nxb3 (16.Qxb3? Nc5) 16...Rxb7 17.Bd2

14...cxd5 15.exd5 Nxd5 16.Nf1 N7b6 17.Bb3 Rc8

White to move

18.Be3

Perhaps 18.Bd2 with the idea of Ba5 would have been more sensible.

18...Nxe3 19.Nxe3 Kh8 20.Nf5 g6

White to move

21.Nh6

There were better options for this knight.

21.Nxd7, eliminating the bishop pair.
21.Ne3, attempting to use d5 as an outpost.

21...Kg7 22.Ng4 f5 23.Ne3 Bf6 24.Nd5 Nxd5 25.Bxd5 Bxd5 26.Qxd5 Rc5 27.Qd2 Qc7 28.Rad1 Rc8

28...d5 and it seems that Black's central pawns will win the day.

29.Qxd6 e4

White to move

30.Nh2??

30.Qxc7+ R8xc7 31.Nd4 Bxd4 32.Rxd4=

30...Bxb2 31.Qxa6 Rc2 32.Rf1 Be5 33.g3 Bxg3 34.fxg3 Qxg3+ 0-1

20 January 2020

Study Position

A new book arrived Saturday and I spent some time going through the first game. Paul Keres, World Chess Championship 1948 (2016 [1949]) is an old classic now available in English. It was sent to me because I solved a chess history exercise on the cover of Chess Life (December 2019).  Keres had Black against Max Euwe in the first round. He was losing, according to his annotations, until Euwe failed to find the correct plan from this position.

White to move


Stockfish does not agree with Keres' assessment of the position. What should we make of his analysis if the computer disagrees?

18 January 2020

Near Perfect?

Scoring 99.6% accuracy on Chess.com's computer-generated assessment might be considered an achievement, even if the game was 100% preparation. However, the game in question featured several risky and dubious moves--a line that I play in blitz and other casual games, but would never attempt in a serious game.

Note in the image from the website's game report that Black had a slight edge early on, even though it was short-lived. During this phase of the game, both players were making so-called book moves. Not all book moves, however, have equal merit. It does seem that the methods of evaluation built into the website's analysis feature does not count dubious or refutable book lines against a player's accuracy score.

Stripes,J. (1838) -- Internet Opponent (1805) [C44]
Live Chess Chess.com, 16.01.2020

1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.c3?! Bc5

4...Nxe4 5.Qe2 d5 is also "book" but White scores poorly.

5.d4

This move is fun to play in blitz and often enough leads to games like the present one, but I doubt I would play it in a serious game.

5.d3 is better, and not surprisingly was played this week in Wijk aan Zee among Grandmasters at the Tata Steel Chess Tournament.

5...exd4 6.cxd4 Bb4+

White to move

7.Nc3

7.Bd2 Bxd2+ 8.Nbxd2 d5 9.exd5 Nxd5 10.Qb3 Na5 11.Qa4+ Nc6 seems about equal (11...c6 12.Bxd5 Qxd5 13.0-0)

7...Nxe4 8.0-0 Nxc3

Now White has an advantage

8...Bxc3! 9.d5 Bf6 10.Re1 (10.dxc6 bxc6 Black is clearly better) 10...Ne7 11.Rxe4 d6 12.Bg5 Bxg5 13.Nxg5 and White is worse.

9.bxc3 Bxc3

9...d5 10.cxb4 dxc4 11.Re1+ Ne7 White has a lead in development, and perhaps Black's advanced pawns are vulnerable. 12.Bg5

10.Qb3

10.Ba3 is preferred by Stockfish 10 on my computer, but Chess.com's version likes my move better. 10...d5 (10...d6) 11.Bb5

Black to move

10...Bxa1

Now White is winning. I like showing this position from Greco to my students. Black is ahead a rook and two pawns when you count all the material on the board, but all of White's pieces are in the game. Most of Black's forces are locked up. They are spectators, rather than players.

10...d5 is Black's last chance for equality 11.Bxd5 0-0 12.Bxf7+ Rxf7 (12...Kh8 13.Ba3 Bxa1 14.Bxf8 Nxd4 15.Nxd4 Bxd4) 13.Ng5 Be6 14.Qxc3

11.Bxf7+ Kf8

11...Ke7 12.Bg5+ Kf8 (12...Kd6 13.Qa3+ Nb4 14.Qxb4+ Kc6 15.Qc5#) 13.Bxd8

12.Bg5 Ne7

12...Nxd4 tests White a little more, but I won a long game from this position last month. White had an easy game.

13.Ne5

I've had this position in at least two other blitz games. It appears in several of Greco's model games and is one I've used often for instructive purposes.

13...d6

White to move

This was a new move to me, but I find that it appears six times in my copy of the ChessBase database.

13...Bxd4 14.Bg6 d5 15.Qf3+ Bf5 16.Bxf5 Bxe5 17.Be6+ Bf6 18.Bxf6 Ke8 19.Bxg7 is in Greco.

14.Bg6

Is a response suggested in Greco's models, despite the absence of Black's d6 move there. The checkmate threat is simple enough.

14...d5 15.Qf3+ Bf5 16.Bxf5

Black to move

16...g6

16...Bxd4 17.Bg6+ Nf5 (17...Kg8 18.Qf7#) 18.Qxf5+

17.Bh6+

Another move that exists in Greco, but with a small difference in the placement of one or two other pieces.

17...Ke8

17...Kg8 18.Be6#

18.Bxg6+ Nxg6 19.Qf7# 1-0

Black's errors offered an opportunity to reproduce one Greco's instructive model games with a new twist. Such minor alterations to the basic idea were his method as near as I can discern from the several books that have been made from his manuscripts.

The evaluation of my performance by Chess.com's software highlights that such resources should be treated with skepticism and using sparingly.

09 January 2020

Seeking Truth

What if? Central to every game of chess even played are the moves that were rejected. Immature chess players care only for the moves that were played, rather than what might have been played.

Several years ago, I was going through a game with a friend who had just finished playing it. As we were examining what might have taken place, his opponent came by and redirected our attention to the game as played. My friend and I were laboring to improve our understanding of the game--the tactics and positional ideas--as preparation for the future. We were seeking missed opportunities where he might have gained an advantage or refuted an attack. I cannot recall the specifics. His opponent seemed to care only for the result of the game just played (he probably won). I have long remembered this event because I believe the attitude of my friend's opponent is the core reason that particular player will never rise above a certain level in his chess skill.

Regularly I see the same attitude among young children. For the past several years, several of the strongest players in our community have staffed an analysis table at youth tournaments. Youth players who bring their game score to the analysis table get a raffle ticket and a free lesson, often from a chess master (FM Jim Maki has been the most consistent analyst since moving to the area). Every child who collects five raffle tickets in a five round tournament earns a pawn key chain, and then there are the prizes that are raffled off--rook, knight, etc. key chains, books, chess sets. In pursuit of the raffle tickets, children sometimes show impatience with the lessons.

I usually run the pairings at these tournaments, but sometimes also spend time at the analysis table. Several times after the next round begins, I've spent time playing through variations on a child's game with one of the other coaches. These are the best moments of the tournament.

Last night, this quest for the truth of a position brought me back to a game that I posted in November (see "Crushing Attack"). I had also posted the game in a forum at Chess.com, where I had highlighted Nana Dzagnidze's brilliant 17...Rxd5 from this position.

Black to move


The game continued 18.Bxd4 Rxg5 and Antoaneta Stefanova resigned. However, she might have played 18.cxd5.

A poster questioned whether 17...Rxd5 was such a brilliant move. What if White had responded differently? First, Black's second best move from the diagram is 17...Nxh3 and then 18.Bxh3 Qd3 leaves Black with some pressure against the king as compensation for the piece.

When I first looked at this game with a group of children in an after school chess club, I liked White's 17.Nd5 because it appeared to solve White's problems and at the same time render Black's attack somewhat critical. Discovering how giving up the queen leads to a unstoppable attack, however, showed me that White's position after 17.Nd5 was not so good.

But, White is not forced to capture the queen.

After the alternative, 18.cxd5, it seems that Black must play 18...Qxd5.

White to move

I spent more than an hour playing against Stockfish from this position this morning. Continuing Black's attack proved challenging.

Stockfish played 19.Qg4, which appears to be White's best option.

19...Nxg2 20.Kxg2

20.Qxg2 Rh5 leads to a version of what transpired against Stockfish that is even better for Black.

I did not easily find the best move here, so took the advice of the engine.

20...Bd7 21.Bxg7 Rh5

White to move

22.f4

22.h4 Bxg5

22...exf3+ 23.Qxf3

Black to move

I tried a lot of different moves here. In every case, I eventually faltered and reached a position that was either equal or clearly worse for Black. I found that I needed to maintain some pressure against White's king and grab some pawns as long as it could be done without loss of time.

It is clear that Black has a nice position. Nonetheless, with the sort of skill Stockfish brings to the position, White's pieces become coordinated and counter-pressure against Black's king makes it difficult to find a clear win.

23...Qxd2

This move kept me in the game longest.

24.Kh1

Running in the database program, instead of the playing program, Stockfish prefers 24.Rf2 Qxg5+ 25.Kh1 when Black at least has two pawns for the sacrifice of the exchange.

24...Qd7 25.Rfd1 Qc8 26.Rd3

Black to move


I played on for awhile, and may try from this position again. Although Black might be objectively better, White's position seems a little easier to play.

31 December 2019

Finishing Things

On the last day of the decade,* it seemed appropriate to look at a rook ending that I played in my last bullet game of the year. A week ago I played a couple of bullet games, did well, and then decided I would try to get my bullet rating back above 1700. It required 160 games to achieve that feat. Along the way, I lost to a national master whose bullet rating was just under 1700. In the final game that lifted me over that milestone, I dropped a pawn early and was fighting for a draw well into the endgame.

Internet Opponent (1906) -- Stripes,J (1709) [A45]
Live Chess Chess.com, 30.12.2019

White to move

39.g5??

39.Rf7+- or Re5 or Rh7. White must protect the a-pawn to maintain the advantage.

39...Rb5= 40.g6

At first, Stockfish sees a slight advantage for White with a couple of alternatives, but as the search depth increases, the evaluation moves towards zero.

40.Rg7 Rf5+ (40...Rxa5 41.Kf2 Rc5 42.Kg3) 41.Ke1 Rxa5=;
40.Rxe4 Rxg5 41.Ra4 b6 42.axb6+ Kxb6 43.Kf2=

40...Rxa5 41.Rxe4

41.g7 Rg5 42.Kg1 a5 43.Kh2 Ka6 44.Kh3 a4 45.Rxe4 b5 46.Rg4

Black to move
Analysis Diagram
46...Rxg7 47.Rxg7 a3 48.Rg6+ Kb7 (or Ka7=; 48...Ka5 loses) 49.g3 a2 50.Rg7+ Kb6 51.Rg6+ Kb7=

41...Rg5 42.Re6

Black to move

42...b5

42...a5 43.Rd6
a) 43.e4 b6 44.e5 a4 45.Re7+ Ka6

White to move
Analysis Diagram
46.e6 (46.g7?? a3-+) 46...Rxg6 47.Ke2;
b) 43.Kf2 a4-+

43.Ke2 b4 44.Kd3 Rxg2 45.Kc4 Rg4+ 46.Kb3 a5 47.Ka4 Rg5

White to move

48.e4

48.Re7+ Kb6 49.Re6+ Kc5 50.Ra6 (50.e4 Rg3-+) 50...Kc4

White to move
Analysis Diagram
51.e4= (51.Rxa5?? Rxg6-+ 52.Rb5 Ra6+ 53.Ra5 Rxa5+ 54.Kxa5 b3-+)

48...Rg1 49.Kxa5 b3 50.Re7+

50.Ra6+ Kb7 51.Rb6+ Kc7 52.Rxb3 (52.Ka6++ Ra1+-+) 52...Rxg6=

50...Kb8

White to move

51.g7??

51.Re5= is the only move to hold the draw.

51...b2-+ 52.Re8+ Kc7

White to move

53.g8Q

53.Re7+ Kd6 54.g8Q Rxg8 55.Rb7 Ra8+ 56.Kb4 b1Q+-+

53...Rxg8 54.Rxg8 b1Q

We have reached an ending that I have attempted several times against the computer with mixed results.

55.Rg5

Black to move

55...Qxe4

55...Qe1+ is better 56.Kb5 Qe2+ 57.Ka4 Qxe4+

56.Rb5 Qa8+ 57.Kb4 Kc6 58.Rc5+ Kd6 59.Rb5 Qe4+ 60.Ka5

Black to move

60...Kc6

60...Qe2 finishes more quickly 61.Kb4 Qd3 62.Ka4 Kc6-+

61.Rb4 Qe1

61...Qd5+ 62.Ka6 Qa2+ 63.Ra4 Qxa4#

62.Ka4 Kc5 63.Rb5+

63.Rb2 is more stubborn

63...Kc4 64.Rb2 Qa1+ 0-1

Time was less critical than it might have been in bullet, as this game was played with a one second increment.



*I realize that some readers believe that the decade ends on 31 December 2020. This belief is grounded in mathematical consistency from the year 1. However, the notion of a decade is an artificial construct grounded not in mathematics but in human culture. Most people who are doing ten-year retrospectives are doing them now, not one year from now. The Western calendar has changed several times over the past two millennia. The years 1 CE and 1 BCE are rooted in speculative dating of events that more than likely took place four to seven years earlier. When the digit in the tens place advances to another number seems like the most logical time to reflect on the previous ten years, and that is what most people do.