19 December 2020

Rubinstein -- Heilmann 1905

In October 2012, my wife and I loaded into the SUV our three month old puppies, and two dog crates, and headed to Eden Valley Guest Ranch. I also carried along a book that had recently arrived in the mail, Akiba Rubinstein: Uncrowned King (1994) by John Donaldson and Nikolay Minev. I wrote about this trip and the game annotated here after returning home (see "Practicing Visualization"). The Hauptturnier was a tournament for aspiring masters. Rubinstein scored 12 points in 15 games, finishing in a tie for first. He was then recognized as a master.

Rubinstein,Akiba -- Heilmann,Ernst [D40]
Hauptturnier-A Barmen (2), 1905

1.d4 d5 2.Nf3 e6 3.c4 c5 4.e3 Nf6 5.Nc3 Nc6

White to move

There are more than 9000 games with this position in Mega Database 2020, reached via several move orders.

6.a3

The main move has been known since Saint Amant played it against Staunton (see "Staunton Annotates").

6...b6

White scores over 70% after this move. Donaldson and Minev call it an error in Akiba Rubinstein: Uncrowned King (1994). Staunton criticizes his own play of this move, calling it "premature" (Chess Player's Companion, p. 342). Daniel Fiske notes this in reference to his own game in the First American Chess Congress, where it was played against him by Napoleon Marache. However, Fiske switches players, asserting that St. Amant played it against Staunton.

6...Ne4;
6...a6;
6...cxd4

7.cxd5! exd5

7...Nxd5 does not fare much better; White wins at least a pawn, according to Donaldson and Minev, citing Minev -- Morcken 1956 (Olympiad). Sherwin -- Chertkof 1957 New Jersey State Championship also offers an instructive reference game.

8.Bb5

First played by Saint Amant in the eleventh match game against Staunton

Black to move

8...Qd6

This move was a novelty at the time that worsens Black's position.

8...Bb7 was played in the two nineteenth century games referenced above. 9.Ne5 Rc8 10.Qa4 Qc7 11.Qxa7 Ra8

(Both players may have studied 11...Be7 12.Bxc6+ Bxc6 13.Qxc7 Rxc7 14.Nxc6 Rxc6 1-0 (50) De Saint Amant,P -- Staunton,H, Paris 1843)

12.Bxc6+ Qxc6 13.Qxa8+ Bxa8 14.Nxc6 Bxc6 1-0 (42) Fiske,D -- Marache,N, New York 1857. The game was published in the book of the tournament, edited by Daniel Fiske. 

8...Bd7 was recommended as an improvement by Saint Amant 9.dxc5 bxc5 10.0-0 Qa5 11.b4 Qb6 12.Ba4 cxb4 13.Nxd5 Nxd5 14.Qxd5 1-0 (46) Wallace,A -- Crane,B, Sydney 1893

9.e4!

This exciting move happens to be the engine's third choice.

9.Ne5 is Komodo's second choice. 9...Bd7 10.Nxd7 Qxd7 11.Qa4 Rc8 12.0-0 Be7 13.e4 Nxe4 14.Nxe4 dxe4 15.Rd1 a6 1-0 (35) Jovanic,O (2476) -- Grbac,B (2190), Porec 2011;

9.dxc5 bxc5 10.e4 is Komodo's top choice

9...Bd7

9...dxe4 10.d5 Nxd5 (10...exf3 11.Qxf3 Nxd5 12.Nxd5 Bb7) 11.Qxd5 Bb7 12.Qxe4+ Be7 13.Bf4 and Black resigned 1-0 Lundin,E -- Staehelin,A, Zuerich 1952

10.e5 Qe7 11.0-0

Black to move

11...Ng8

11...Ng4 12.Nxd5 Qd8 13.Bg5 Ne7

12.Nxd5 Qd8 13.Qa4

Other moves might be a little better if the engine should be heeded, but White's advantage is overwhelming in any case.

13.Re1 Be7 14.e6 fxe6 15.Nf4;
13.e6 fxe6 14.Nf4;
13.dxc5 Bxc5 14.Qa4

13...Rc8 14.Bg5 14...Nge7

White to move

There is something about this position that makes me think of Morphy's Opera Game.

15.dxc5

15.Nc3

15...bxc5 16.Rad1 a6 17.Qxa6 Nd4

17...Nb8 18.e6 Nxa6 19.exd7+ Qxd7 20.Bxd7+ Kxd7 21.Nxe7+

18.Nxd4 cxd4 19.Rxd4 1-0

Rubinstein's play was exemplary. I return to this game from time to time and marvel at how Heilmann's game fell apart so quickly.

17 December 2020

Staunton Annotates

The game below was the eleventh game in the 1843 match between Howard Staunton and Pierre Charles Fourier de Saint Amant. The match was held in Paris over the course of six weeks in November and December. An earlier match in London had been won by Saint Amant 3 1/2 - 2 1/2.

This game came to my attention as I was studying Rubinstein,A. -- Heilmann,E., Barman 1905.

I transcribed the notes from Howard Staunton, The Chess-Player's Companion (London 1849). Nick Pope also has transcribed these notes, as well as notes on the game from another publication by Staunton, and Saint Amant's notes from Le Palamède (see Chess Archaeology)

De Saint Amant,Pierre Charles Fourier -- Staunton,Howard [D40]
Match Staunton-Saint Amant, 02.12.1843

1.d4 e6 2.c4 d5 3.e3

"It is not advisable for the opening player, in games of this description, to carry his Q. B. over to the K's side, on account of the attack the adversary obtains by playing his Q. to her Kt.'s 3rd." (Staunton)

3...c5 4.Nc3 Nf6 5.Nf3 Nc6

White to move

This symmetrical position has occurred in more than 9000 games since the historic 1843 match. I've had it myself fifty times or more, playing both sides. Symmetry generally slightly favors the player with the move.

6.a3 b6

"The importance and utility of this move, when made at the proper moment, have been indisputably proved, we think, by the earlier games; it is evidently premature, however, and made without reflection here." (Staunton)

6...cxd4 7.exd4 would be my suggestion. But, even 6...a6, maintaining the symmetry, is better than Staunton's move. Heilmann repeated this folly in 1905 and lost a miniature to Rubinstein.

7.cxd5 (5)

The number in parentheses indicates the amount of time Saint Amant spent thinking on this move. Captain Harry Wilson accompanied Staunton on the trip to Paris and kept a log of the time used by each player in games 2 through 15. Staunton published lists of move times of every move where five minutes or more were spent. These times appear in the annotated game here.

7...exd5 8.Bb5

Black to move

8...Bb7

"We agree with M. St. Amant in believing that Black would have avoided the loss of a Pawn by playing the B. to Q's 2nd, instead of the Kt.'s 2nd." (Staunton)

Staunton is referencing Saint Amant's annotations in Le Palamède,

8...Bd7 9.Ne5 Nxe5 10.dxe5 Bxb5 11.Nxb5 Ng8 and White won in 38 moves, Correa,A (2345) -- Van Riemsdijk,H (2435) Brasilia 1994.

9.Ne5 [5] Rc8 [5] 10.Qa4 Qc7 [5] 11.Qxa7 [8] Be7

White to move

Staunton spent 8 minutes on Be7, and commented, "He does not appear to have any better move."

12.Bxc6+

Saint Amant initiates a series of exchanges that seem to me to relieve the pressure on Black's position, but also leaves White a pawn ahead. In a comment on the next game, Staunton references a remark in another of his publications, the Chess Player's Chronicle:

“As M. St. Amant, during the latter games of the match, played mainly to draw, and Mr. Staunton solely to win, the former estimating a remise as a victory, and his opponent looking on it as a defeat, it frequently happened that, while M. St . A. sought eagerly for every opportunity of exchanging Pieces, Mr. S. sacrificed position and occasionally the game itself to prevent him.” (C.P.C., vol. v., p. 44) 

I considered several alternatives for White:

a) 12.Qa4 0–0 13.Nxc6 Bxc6 (13...Ra8?? loses a piece 14.Nxe7+ Qxe7 15.Qd1) 14.Bxc6 Qxc6 15.Qxc6 Rxc6;
b) 12.0–0 0–0 13.Bxc6 (13.Nxc6 Bd6 (13...Bxc6 14.Qxc7 Rxc7 15.a4!) 14.Na4 Bxh2+ 15.Kh1 Bd6 16.Qxb6+–) 13...Bxc6 14.Qxc7 Rxc7;
c) 12.Bd2 0–0 13.Bxc6 Bxc6 14.Qxc7 Rxc7 15.Nxc6 Rxc6 16.f3

12...Bxc6 13.Qxc7 Rxc7 14.Nxc6 Rxc6 15.0–0

Black to move


15...Kd7 (5)

"This is far better than castling, because it brings the King more immediately within the sphere of his Pieces' operation." (Staunton)

16.Rd1 c4 17.f3

"Well played, and a difficult move for White to answer."

Staunton's comment does not make sense. Perhaps he means that it is difficult for Black to answer, or perhaps a printing error appended the comment to the wrong move. Perhaps it should appear in reference to Black's 16...c4. Nick Pope gives only "well played" after White's move.

17...Rd8

White to move

18.Bd2 (6)

"Better, we should have thought, to advance the K. P. at once." (Staunton)

18...h6 19.Na2 g5

Here Staunton praises his own play: "By the vigour and boldness of the attack on this side Black nullities the inequality of force."

20.Bb4 Re6

"With the intent to double his Rooks, when circumstances require him to do so." (Staunton)

21.Bxe7 Rxe7 22.Kf2

Black to move

22...g4 23.Nc3 h5 24.Re1 Rde8 (5) 25.Re2 h4 26.Rae1 Rg8

White to move

27.e4 (8) 27...g3+

"Compelling the King to retreat again." (Staunton)

28.Kg1 dxe4 29.Nxe4 Nxe4 30.fxe4

"Taking the Kt. with the R. would possibly have been better." (Staunton)

30...Rg4 (6) 31.hxg3 hxg3

White to move

32.Re3

"This was an important precaution lest Black should double his Rooks on the K. R's file. It also enables White, at the fitting moment, to place his R. on the K. B's 3rd." (Staunton)

32...b5 33.R1e2 (7)

"To afford his K. an opportunity of passing over to the Q's side." (Staunton)

33.Kf1 f6 (33...Rf4+ 34.Rf3) 34.Ke2?? obviously fails.

33...Re8 15 minutes--Staunton's longest think of the game.

White to move

34.Kf1 15 minutes--Saint Amant's longest think of the game

34...Kd6 35.Ke1 (7) 35...Rf4 (10) 36.Kd2

"By taking the Kt. P. he must have sacrificed his Pawns in the centre." (Staunton)

For instance, 36.Rxg3 Rexe4 37.Rxe4 Rxe4+ 38.Kf2 Rxd4 39.Ke2 and the position seems equal to me.

36...f5

White to move

37.Rxg3 (10)

Better might have been 37.exf5 Rxe3 38.Rxe3 Rf2+ 39.Kc3 Rxg2 when White has a slight advantage.

37...Rfxe4 38.Rxe4 Rxe4 39.Kc3 Kd5 40.Rf3 f4

White to move

41.g3 (5)

"From this point Black has a 'forced won' game." Staunton is correct. Saint Amant just blundered away the game.

41...Re3+ 42.Rxe3 fxe3 43.Kc2

"He has nothing better to play." (Staunton)  

Black to move

43...Ke4

And Staunton has just blundered the game back. 

 "We have here a second instance where a momentary relaxation loses Mr. S. the honours of a well-won victory when just within his reach. To any one who has never undergone the punishment of playing an arduous game of many hours' duration in a densely crowded room, such a lapse as Black's in the present, or in Game IX, may well appear inexplicable, but those players who have, will know the difficulty of keeping up the preternatural tension of the mind required so long, without a disposition to relieve it by one hasty move. The want of reflection in the present cases must be admitted to have been mortifying enough. Of the twelve first games these two, (and these actually given him,) were the only two games scored by the French player, consequently, but for them, he would actually have lost the match without winning a single game!" (Staunton)

Staunton presents the following variations in The Chess-Player's Companion

43...Kxd4 44.Kd1 (44.g4 Ke4 45.Kd1 (45.g5 Kf5) 45...Kf3 46.Ke1 Kxg4) 44...Kd3 45.g4 e2+ 46.Ke1 Kc2 47.g5 Kxb2 48.g6 c3 49.g7 c2 50.g8Q c1Q+ 51.Kxe2 Qc4+

44.Kd1

And now White has a winning ending.

Black to move

44...Kd3 45.d5 e2+ 46.Ke1 Kc2 47.d6 Kxb2 48.d7 c3 49.d8Q c2 50.Qd2 1-0

"And after a few moves Black resigned." (Staunton)

After this game, Staunton led the match 8-2. Game three had been drawn. Over the next ten games, Saint Amant won four, Staunton won three, and four games were drawn.

04 December 2020

Textbook Ending

 In today's Morning Membership tournament on Chess.com, two players found themselves in a difficult pawn ending with under a minute remaining. The time control was game in five minutes with a two second increment (5+2). White had 18.5 seconds and Black had 38 when Chris started showing the game on Twitch. Chris Bird is the tournament director and streams these weekly events.


Both players shuffled their kings back and forth until a repetition occurred. When players are premoving, as they seemed to be doing, draw offers are often refused even as they are made. It was not clear from Chris's discussion whether he knew that White had a winning position.

In the screenshot, White has just played 51.Kd4.

There was an alternative.

51.Kb5 wins.

After 51.Kb5!

This move can be frightening with less than twenty seconds left, but it is the correct move. White has stepped out of the square of Black's pawn. If White fails to promote first, or set up a checkmate, Black will also promote.

After 51...Kc8, White has two ways to proceed.

52. Kc6, or 52.a6. I played the latter against Stockfish 11, which replied 52...e3.

White to move

Now, only one move wins for White. All others lose.

After 53.b6+, 53...Kc7! leaves White lost. However, 53...Kb8 allows 54.Kb6 and 55.a7#. In one of the textbook lines beginning with 51...Kb8, Black promotes the pawn just before getting checkmated.

53.a6 allows 53...Kb7 and White can make no further progress, while Black's e-pawn cannot be stopped.

53.Kc6! e2 54.b7+

Black to move

54...Kb8 55.Kb6 e1Q Black promotes first, but White checkmates with pawns. Stockfish chose a longer checkmate.

54...Kd8 55.b8Q+ Ke7 56.Qe5+ and White wins.

While watching the Twitch stream, I saw a familiar pattern. After the tournament, I out that my belief that White was winning was indeed correct. Although as a practical matter, with less that twenty seconds remaining, I, too, might have taken the draw.

The textbook position appears in Dvoretsky's Endgame Manual. Consequently, it is a position that I have played out several times with my students (see "Pawn Ending Flash Cards").

White to move

I know the technique through training with positions from Dvoretsky. Likely other books have the position as well, and it appears in Harold van der Heiden's Endgame Study Database. Heiden credits Reuben Fine, Basic Chess Endings (1941), while Dvoretsky credits the nineteenth century composers J. Kling and B. Horwitz.*

In any case, the first critical position is reached after the moves:

1.Kd4 Kg4 2.h4 Kh5 3.Ke3 Kg4 4.Ke4 Kh5 5.Kf4 Kg6 6.g4 Kg7

White to move

7.g5 is a mistake. White can move the king, but the way forward is 7.h5!

7...Kh6 8.Kf3

Heiden has 8.Ke4 here. Dvoretsky's solution is three moves longer, so seems to offer better defense by Black. Both 8.Kf3 and 8.Ke4 have the same number of moves to mate, according to my chess engine.

Dvoretsky points out the importance of triangulation for White.

8...Kg5 9.Ke4 Kh6 10.Kf4 Kh7 11.g5 Kg7 12.g6 (12.h6 loses) 12...Kf6 13.Ke4 Kg7 14.Kf3 Kf6 15.Kf4 Kg7

White to move

Now, White's confidence comes into play, as it is time to leave the square of Black's passed pawn.

16.Kg5 c3 17.h6+ Kg8 18.Kf6 (see the critical Kc6 in my analysis of what might have been above).

18...c2 (so close to becoming a queen!)

19.h7+ Kh8 

White to move

20.Kf7 c1Q

Black promotes, but White will promote with check.

21.g7+ Kxh7 22.g8Q+ Kh6 23.Qg6# 

This ending is worthy of study. Perhaps if your nerves are calm, you can win with a quarter minute and a two second increment should you find yourself is a comparable position.


*Fine, on my reading presents a similar position that is a draw. He does mention winning chances, though, if the pawns on the left are another row to the right of the position illustrated here. There seems some room for some historical research.

29 November 2020

Endgame Study Database

Harold van der Heiden has released the sixth edition of his definitive Endgame Study Database. The first version was released in 1991 and contained 23,358 studies. Subsequent expanded editions were released in 2000, 2005, 2010, and 2015. Keeping with this schedule, he plans a seventh edition in 2025. The sixth contains 93,839 studies. Each edition adds to the size, while also correcting errors found in previous editions.

More information is available on his website.

When I initiated the purchase process this morning, he sent me a PayPal invoice. Shortly after I paid the invoice, I received an email with download instructions. I installed it in ChessBase.

Poking around among the pawn endings brought this position to my notice.

White to move

M. Zinar 2020

The solution runs 77 moves, but in fact everything is quite simple.

Perhaps after I have used this resource extensively, I can write a full review. For now, I can say that I've read about it for many years, and have been on the cusp of purchasing it more than once. This morning when I saw the new edition had been released, I acted within minutes. I'm happy that I did.

27 November 2020

Heartbreaking

Last Saturday was the second local online tournament for the 2020-2021 youth chess season. In "Lessons from a Youth Tournament", I presented an overview of the event and two instructive games. Today's article features some positions where the player on move had an opportunity for immediate checkmate and did not seize the opportunity. Such moments are too frequent in youth play, and can make it difficult to watch youth games.

I remember the first tournament for the player of the Black pieces in the first position. He was young and was winning game after game, including some nice wins against seasoned competitors. Where did he come from? Who is coaching him? He still shows that he can hold his own among all but the very best local players, and even they must bring their A game or suffer the consequences.

I was watching this game as it transpired. Black had an unstoppable checkmate that could be delayed and disrupted by a queen sacrifice, but could not be stopped. He played the first move while I was watching. I then waited for what seemed a long time for the final move and the end of the game. Checking the game times this morning, however, I discovered that this long wait was less than thirty seconds.

Black to move

He played 26...Qd5, threatening checkmate on g2. His opponent blocked the immediate mate with 27.f3. Black still had a mating attack, but it was more complicated. He missed it, too, and White's queenside pawns turned the material advantage back in favor of the first player who eventually won the game.

Our youngest player thoroughly dominated in round two, reaching this position.

Black to move

36...Qxe1+ is still a winning move, of course, but not the move that checkmates. Several moves later, Black suffered the fate of so many youth players who achieve overwhelming force against a weaker opponent: stalemate.

In the final round, the kindergartner once again had a good game with a forced checkmate in two. The first move in the sequence, 29.Nd6+ was played.

White to move

The game continued another eleven moves with White kicking the Black king around. After the game, we learned from a parent that Black offered a draw and White refused, but the game was drawn anyway. I had been watching the conclusion and thought I saw a repetition, which was communicated to the parent. Careful checking confirmed that a position had been reached for the third time with Black on the move each time when Black offered the draw. The game could have ended victoriously for White earlier.

Black won this next game in 63 moves via checkmate, but it is move 35 here.

Black to move

The oldest player missed a forced checkmate in two from this position, although she did win a few moves later. That game was featured in the post linked above.

White to move

In a battle between two second graders, the victorious player missed a quicker finish from this position.

White to move

Finally, Black found checkmate on the second move from this position, but it is available now.

Black to move

Having seen many similar examples of missed checkmates over twenty years of coaching youth players, I have developed a large number of resources for teaching checkmate patterns. Some fifteen years ago, I wrote a small booklet, "A Checklist of Checkmates", that I incorporate into my awards curriculum (see "Knight Award Problems"). Inquiries concerning this pamphlet can be submitted through the contact link on the right. My self-published Checkmate and Tactics (2019) contains a fair number of checkmate exercises and its "glossary" explains some of the most common patterns. Forcing Checkmate (2017) consists of a series of exercises that begin with fifty checkmates in one, then two, then contains a number of exercises where checkmate can be forced in longer sequences up to nine moves. It offers good practice for youth players.

Despite these available now, last weekend's tournament has motivated me to develop additional materials. Young players, in my opinion, should be regularly solving simple checkmate exercises on a regular basis. You cannot win the game if you cannot find checkmate.

23 November 2020

Lessons from a Youth Tournament

What can we learn from the play of a group of young players ranging in skill from beginners to seasoned tournament players? I think we can learn quite a bit.

After running the pairings and watching the games of twenty youth players from grades kindergarten through tenth grade, I have been going through their games carefully. There are examples of finding and executing tactical sequences to achieve a decisive advantage, or even a long-term initiative. But, there are also instances of giveaway chess, where a player seems unconcerned with vulnerability. Queens and lesser pieces are placed en prise, and sometimes left alone.

There are well-executed checkmates, and there are draws that followed from a young player missing a simple checkmate in one move. Two games featured three-fold repetition, but only one was claimed. Thirteen of the 49 games lasted 25 moves or less (miniatures), while seven games lasted fifty moves or more. Some of the miniatures revealed strong opening preparation.

King's pawn openings were most popular with the Italian Opening leading. Nearly one-third of the (15) games are classified C50 in the Encyclopedia of Chess Openings. Six games began with a move other than 1.e4. One player played 1.d4 three times, while another played 1.Nf3 twice. One game began 1.e3, and one wonders whether it was a mouse slip.

Black and White had an even score, each winning 23 games. Three games were drawn. Twenty participants played 49 games.

Illustrative Games

The first illustrative game pits the eventual tournament winner against one of the youngest players, a second grader.

A Boy (1157) -- A Girl (1634) [C50]
Turkey Trot (1), 21.11.2020

1.e4 e5 2.Bc4 Nf6 3.Nf3 Nc6 4.Nc3 Bc5

White to move

This position appeared in six games in the event.

5.0-0 0-0 6.d3 h6

Black, who is one of my students, understands how a pin of the knight can be a bother in such positions.

7.Bd2 d6 8.Qe2 Oblivious to the danger?

8.h3 prevents the pin

8...Bg4 9.Be3

Keeps the knight off d4

9...Bd4 10.Nb5 a6

White to move


11.Nbxd4 

11.Nc3

11...exd4 12.Nxd4?? 

The game losing blunder. 12.Bd2 Ne5 and Black still has a clear advantage.

12...Bxe2 13.Nxe2-+ Qe7 14.Nf4 Qe5 15.Ne2 Ng4 16.Bd2

16.Ng3

16...Qxh2# 0-1 

Another Italian Four Knights took a different course. When Black blundered, White seized the initiative, winning some material and bringing pressure against the king. It was enjoyable to watch this game as it progressed, trying to find for myself the surest finale.

Another Girl (1446) -- Another Boy (930) [C50]
Turkey Trot (3), 21.11.2020

1.e4 e5 2.Bc4 Bc5 3.d3 Nf6 4.Nf3 Nc6 5.0-0 d6 6.Nc3 Bg4 7.h3 Bd7 8.Be3 Bxe3 9.fxe3 Nh5??

White to move

10.Nxe5!

10.Bxf7+ is even better 10...Kxf7 11.Nxe5+ Kg8 12.Nxd7 Qxd7 13.Qxh5+-

10...dxe5?

10...Nxe5 11.Qxh5 0-0±

11.Qxh5 g6 12.Bxf7+ Ke7

12...Kf8 13.Qh6+ Ke7 14.Qg5+ Kd6 15.Rf6+ as in the game.

13.Qg5+ Kd6 14.Rf6+ Be6

White to move

15.Bxe6!

15.Rxe6+ is less strong, but is what I might have played. 15...Kc5 16.Rxe5+ Nxe5 17.Qxe5+ Kc6 (17...Kb6 18.Qb5#) 18.Bd5+ Kb6 (18...Kd7 19.Qe6#) 19.Na4+ Ka5 20.Bc6+ Qd5 21.Qxd5+ Ka6 22.Bxb7#

15...h6 16.Qxg6

I wanted her to find 16.Bc8+ Kc5 17.b4+ Kxb4 18.Rxc6!! bxc6 (18...Qxg5 19.Rb1+ Ka5 20.Rb5#) 19.Qxe5 Ka3 (19...Qxc8 20.a3#) 20.Rb1 Qd5 21.Qxd5 cxd5 (21...Rb8 22.Qa5#) 22.Rb3#

16...Nb4

White to move

17.d4!

Again, I was looking for17.Bc8+! Kc5 18.d4+ exd4 19.Na4+ (19.exd4+ Qxd4+) 19...Kb5 20.Bxb7; 17.Bc4+ Kc5 (17...Kd7 18.Qf5+ Ke8 19.Rf8+ Rxf8 20.Qg6+ Rf7 21.Qxf7#) 18.Na4#

17...exd4 18.exd4 Nxc2

White to move

19.Bd5+

My persistent idea is clearly better here: 19.Bc8+ Qxf6 20.Qxf6#

19...Kd7 20.Qf5+ Ke8 21.Re6+

21.Rf8+ Rxf8 22.Qg6+ Rf7 23.Qxf7#

21...Kd7 22.Re5+ Kd6 23.Qe6# 1-0

There are other lessons possible from many of the other 47 games. Perhaps I will write more another day.

12 November 2020

Checkmating Patterns

I recently added to my bookshelf A Modern Guide to Checkmating Patterns (2020) by Vladimir Barsky. This book extends the work of two older books that are scarce and therefore expensive: Victor Henkin, 1000 Checkmate Combinations (2011), and Mikhail Tal and Victor Khenkin, Tal's Winning Chess Combinations (1979). The latter two books were published in Russian sometime before the English editions came out. I have a hunch it was a single book with two English editions. Tal's introduction "Don't Re-invent the Wheel" in the 1979 text appears as "Don't Reinvent the Bicycle" in the 2011 version with some differences. 

I have a hardback copy of Tal's Winning Combinations that I bought in the past decade, but passed up a chance to buy the Batsford edition, 1000 Checkmate Combinations. My recollection of when and where I looked at it does not correspond to the publishing date because I think it was a few years before 2011. I failed to comprehend then the significance of my opportunity. There is a Kindle version of the Batsford edition. The diagrams are a bit pixilated, but clear enough on my iPad.

All of these books arrange checkmate patterns according to which pieces effect the execution of the enemy king. Barsky credits Viktor Khenkin, The Last Check with the "methodology" (7). A Modern Guide to Checkmating Patterns is wholly new. Barsky assembles illustrative positions and exercises exclusively from the twenty-first century. This one caught my eye this morning in the opening chapter.

White to move


The position arose in Lenderman,A. -- Gareyev,T., Mesa 2010. Lenderman played 30.Rd6 and Black resigned. The rook's interferes with the defensive contact between Black's queen and rook, threatening Qxb8#.  White's queen is safe from capture because of Black's weak back rank. Any move of Black's rook dooms the knight. Barsky gives 30...Rc8 31.Ra6 Nc4 32.Qxc4 Rxc4 33.Ra8+ with mate to follow (12-13).

A few years ago, when I was reading Tal's Winning Chess Combinations, I was struck by the quality of the examples. Barsky's examples also seem rich with possibilities. The book serves not only to teach elementary patterns, but also to stimulate the imagination.

Khenkin's original approach to discerning and organizing checkmate patterns is worthy of attention. It varies slightly in the three books that I have before me. Listing the table of contents of each of the three will serve to highlight the continuities while also marking slight differences in the approach.

Tal's Winning Chess Combinations Contents:

1. The Rook
2. The Bishop
3. The Knight
4. The Queen
5. The Pawn
6. Two Rooks
7. Queen and Bishop
8. Queen and Knight
9. Rook and Bishop
10. Rook and Knight
11. Two Bishops
12. Two Knights
13. Bishop and Knight
14. Three Pieces

1000 Checkmate Combinations Contents

1. The Rook
2. The Bishop
3. The Queen
4. The Knight
5. The Pawn
6. Two Rooks
7. Rook and Bishop
8. Rook and Knight
9. Two Bishops
10. Two Knights
11. Bishop and Knight
12. Queen and Bishop
13. Queen and Knight
14. Three Pieces

The first two books offer the same chapters, but the sequence differs. The content is similar, but the Batsford edition contains more exercises. In the new book by Barsky, the number of chapters is reduced by combining pawns and the three chapters featuring minor pieces into a single chapter.

A Modern Guide to Checkmating Patterns Contents

1. The Rook
2. The Queen
3. The Minor Pieces and Pawns
4. Two Rooks
5. Rook and Bishop
6. Rook and Knight
7. Queen and Bishop
8. Queen and Knight
9. Queen and Rook
10. Three Pieces

10 November 2020

Informant 145

Chess Informant 145 is now installed in ChessBase. If only I can find the time to pursue my chess study. Exercises open in solving mode.