24 November 2021

Bishop takes Pawn with Check!

Two positions were presented to my elementary students at the after school chess club yesterday. The first occurred in my shortest game in a weekend Swiss. The second position did not occur in Nepomniachtchi,I. -- Carlsen,M., Halkidiki 2003. Cyrus Lakdawala explains in Nepomniachtchi: Move by Move (2021), which was just published, that Carlsen, "even as a newborn infant, wouldn't fall for 8...dxe3??" I explained to the students that Carlsen was not born knowing this tactic, but learned it, just as they can.

My short loss:

Rodriguez,Luis (2211) -- Stripes,James (1472) [B21]
Collyer Memorial Spokane (1), 21.02.1998

1.e4 c5 2.d4 cxd4 3.c3 dxc3 4.Nxc3 d6

Remembering the game incorrectly, I presented my move as 4...Nc6, which is probably a more accurate move order.

5.Bc4 a6?

A waste of time. 5...Nc6 should be played. After 5...Nc6, it is still possible to fail the way I did in the game. For instance, 6.Nf3 Nf6 7.e5 Nxe5?? 8.Nxe5 dxe5. This was the position shown to the students because I was presenting the tactic from a faulty memory.

6.Nf3 Bg4??

Utter foolishness.

7.Ne5+- dxe5

White to move
8.Bxf7+ 1-0

I resigned because I had far better things to do than watching how easily a master would checkmate me from such a horrid position.

Ian Nepomniachtchi (2447) -- Magnus Carlsen (2450) [B06]
Wch U14 Halkidiki GRE, 2003
1.e4 c5 2.c3 d5 3.exd5 Qxd5 4.d4 g6 5.Nf3 Bg7 6.Na3 cxd4 7.Bc4 Qe4+ 8.Be3

The game continued 8...Nh6

For the children, however, the error that Magnus Carlsen could see through is worth examining.

After dxe3??

White to move

9.Bxf7+ wins the queen.

9...Kxf7 allows 10.Ng5+ forking king and queen.

9...Kf8 delays the fork one move. 10.Qd8+ Kxf7.

The World Chess Championship between Champion Magnus Carlsen and Challenger Ian Nepomniatchchi begins at 16:30 Friday afternoon in Dubai. That's 3:30 am in my time zone. I may not watch the beginning of the game live, needing some sleep. But, I will check on the progress as soon as I awake.


18 November 2021

Learning Checkmate (Or Teaching It)

Youth chess has had a profound impact on my thinking about the game. In countless youth events, I have watched children playing out rook and king vs. lone king. Often one of them tells the other, "I think this is a draw." Sometimes they look at me for confirmation. When the stronger side has a queen, they know it should be a win, but often cannot find it. Check, check, check, ... but never checkmate.

Having observed such scenes several times in my first few youth events as a coach more than twenty years ago, I made it a point to teach elementary checkmates to my students. I have spent hundreds of hours teaching checkmate with queen and rook, or coordinating one of them with the king against a lone king. The first eleven endgames in Bruce Pandolfini, Pandolfini's Endgame Course (1988) became a valuable resource for teaching.

Some books on checkmate
I have added to Pandolfini's basic positions a great many others, some composed, some from games where a player executed a checkmate well, or where someone failed. Other books have expanded my resources. William Lewis, Elements of Chess (1819) is a neglected gem. It contains very few diagrams, so it is not always easy to appreciate at a glance the sorts of positions he offers for training new players. Last month's post "Elementary" shows one that I find useful.

Several posts here on Chess Skills have outlined how I teach elementary checkmates with few pieces to children. Both Pandolfini and Lewis are mentioned in "Teaching Elementary Checkmates" (2014). Both "Cutting Off" (2015) and "Playing with Rooks" (2016) offer additional examples as they document lessons as I use them in after school clubs.

Older Beginners


Not all beginners are children, of course. Chess is enjoying growth in popularity at the present. Some adults are returning to the game after many years away. Others are taking it up for the first time. Chess groups on Facebook and forums on several chess sites are inundated with requests for advice for those starting out.

My standard refrain is to point these seekers to "Advice for Beginners", which I wrote last January. At the core of that advice is Jose Capablanca, Chess Fundamentals (1921). I have adopted Capablanca's sequence from this book in my own teaching. He starts with simple checkmates, and appears to suggest a pattern that starts at the end of the game and works towards the beginning.

Chess Fundamentals and the companion volume A Primer of Chess (1935) offer instruction in basic checkmates with few pieces, as well as some middlegame combinations where checkmate is possible, or where a checkmate threat forces concessions. Something more is needed to address some of the failures I have observed in games after game of beginning players, young and old.

The position below arose in a game between two beginners. One has been playing chess less than three months, but the other has been playing at least seven years. Naturally, there are a great many errors in the game that could be highlighted. 

Black to move
When I reached this position while playing through the game, I instantly saw an unforced checkmate in two. Consequently, calculation begins with 26...Qh3+ 27.Kg1 (Ke2 walks into checkmate). It does not take long to see a sequence involving bishop and queen that can be found in dozens of exercises in books and online.

For instance, Georges Renaud and Victor Kahn, The Art of the Checkmate offer Mate No. 12C.

White to move

They opine, "Nine times out of ten, the beginner will play QxP ch, and be surprised afterward to find that the king is able to escape after all" (140). In the 2015 Batsford translation, these words are rendered, "The novice has a tendency to play 1. Qxh7+ and it is quite a surprise to see that the attacked king manages to take flight."

The mating sequence is 1.Bxh7+ Kh8 2.Bg6+ Kg8 3.Qxh7 Kf8 4.Qxf7#.

In the game, the experienced beginner played 26...Qh1+ and lost ten moves later when the newer beginner found a mate in one.

White to move

Diagnosing Failure


In the game above, Black had 46 seconds remaining (of an initial five minutes) when this position was reached.

Black to move
25...Qxh2+ was played. Three seconds were spent on this move. Does the player feel rushed when under one minute? Is the player oblivious to the presence of the bishop? If so, he may have feared that the queen could be captured. The queen was left en prise later in the game. In fact, Black had six seconds remaining when 34...Qxf2 was played instead of 34...Qxa7. That error led to the checkmate. Both queens were en prise on move 34.

The player of the Black pieces has played more than 1400 blitz and rapid games on chess.com. In the past 500 games, 140 have ended with checkmate by the queen. In many cases, the queen has been supported by a bishop, but more often by a knight or rook.

This one is typical.


My impression from looking through all 140 queen checkmates in these 500 games leads me to the belief that the player in question knows a few checkmate patterns, but could benefit from learning more.

Another game illustrates our experienced beginner in pursuit of a checkmate with bishop and queen that he has executed in several prior games.

Black to move
24...Bb3

24...Qxd3 was far better. In fact, it is the only move that maintains the advantage. It threatens Qb1# and Ne2#. I suspect that Black had ambitions of playing Qxd3 next with the idea to play Qc2#. That pattern appears several times in the player's games.

25.Rde1 Qxd3 26.Nd4

Now White has c2 defended.

26...Nf5

Black hopes to remove the knight.

27.Bxb7

27.Be4 wins simply, but White gets credit for opening the g-file in a way that allows Black to continue with a plan that is too slow.

27...Nxd4 28.Qxg7#

Black's pursuit of a plan was performed without recognition of White's threats.

The Remedy


Resources are abundant for a beginner or even intermediate player who wishes to improve their understanding of checkmate patterns. The popular playing site, Lichess offers a series of lessons where certain named patterns can be played against a chess engine. Navigate to Learn > Practice from the menu.


Books offer greater depth.

When David Weinstock, whom I had just met, recommended to me Renaud and Kahn, The Art of the Checkmate, I recall thinking to myself that he was underestimating my chess skill. I believed that checkmate was a skill I had developed well. I was a C Class player in the USCF rating system who had recently returned to active chess after more than a decade of only occasional casual games. Two decades earlier in high school, I invested many hours practicing checkmates with heavy pieces and even the bishop pair. While playing through master games, I often continued them beyond the resignation to work out the checkmate possibilities.

Despite my attitude that I was beyond the need for such study, I examined the book carefully when I saw it in Auntie's, Spokane's independent bookstore. It did not take long to realize that it offered a little more depth than I had imagined when David mentioned it. I bought the book and started working through it. New checkmate patterns began to appear in my games.

The Art of the Checkmate has become one of the books that I recommend more often than most others. Few other books offer the quality of instruction on a matter of such foundational importance to developing chess skills. The authors offer 23 basic patterns. Most have several variations. They illustrate each one with the essential pattern of the pieces and the moves making up the mating sequence. These patterns are followed by illustrations from composed studies, game fragments, and whole games. Quiz sets follow each of the five sections.

Other Books


A few years ago, another group of books for teaching and learning checkmate patterns were brought to my attention. Someone suggested that I take a look at Mikhail Tal and Victor Khenkin, Tal's Winning Chess Combinations (1979). This book, which I found used at a reasonable price, takes each piece separately, examining how it is typically used to effect checkmate. Each piece, excluding the king, is given a chapter. Eight additional chapters treat two pieces in concert, such as queen and bishop or queen and knight. The last chapter considers several combinations of three pieces.

This position illustrates a back rank checkmate threat that leads to winning material.

Black to move

1.Qb2

Victor Henkin, 1000 Checkmate Combinations (2011) is a newer translation of the same Russian text, according to Vladimir Barsky, it is titled The Last Check. Both books are out of print, hard to find, and consequently expensive, except that the newer text has been available in Kindle format. It is scheduled to be released again in paperback in February 2022. Barsky, A Modern Guide to Checkmating Patterns (2020) adopts Khenkin's methodology, drawing only from games played in the twenty-first century. I discussed these three books in greater detail in "Checkmating Patterns" (2020).

I am less enthusiastic about Murray Chandler, How to Beat Your Dad at Chess (1998). This book offers excellent illustrations of basic patterns with abundant diagrams, and adds a few tactical motifs for breaking through the opponent's defenses. It is probably an excellent choice for children, while being suitable for adults as well. My lack of enthusiasm for the book stems from its lack of depth. It offers fewer examples and far less instructive discussion than The Art of the Checkmate and also found in Khenkin's text. Several of the "50 Deadly Checkmates" promised by the book are tactics that win material that seem to have been included to reach that magic number 50. 

Victor Vukovic, The Art of Attack in Chess has a chapter presenting checkmate patterns. Improve Your Chess Now by Jonathan Tisdall lists common checkmate patterns in an appendix. I used these two, as well as Chandler, and Renaud and Kahn while creating a list of 37 patterns that I organized into groups: corridors, diagonals, intersections, knights, queens, and combinations. I created seven sets of worksheets with instructive material for my students and printed a few copies of the whole manuscript, also offering for sale a PDF version under the title "A Checklist of Checkmates". My list appears at "Checkmate Patterns" (2017). This work contains errors that I would like to correct (see "Pillsbury's Mate").

Antonio Gude, Fundamental Checkmates (2016) deserves more attention. I have had this book for a few years, but it sits on my shelf untouched while I keep returning to those I know better. The instructive portion combines the approach of Renaud and Kahn with that of Victor Khenkin and then extends both with nearly 100 pages devoted to sacrifices, organized by the piece giving itself up. Three sets of exercises total 317 problems with solutions.

The well-known combination sacrificing a queen to deliver smother mate with a knight is often called Philidor's Legacy, although many others credit Gioachino Greco because of this combination.

Black to move

15...Nf2+ 16.Ke1 Nd3+ 17.Kd1 Qe1+ 18.Nxe1 Nf2#.

Gude credits the historian Joaquin Perez de Arriga with pointing out that the combination appears in Luis Ramírez de Lucena, Repeticion de Amores e Arte de Axedrez (1496).

White to move
Gude even points out that Lucena, "specifies that the solution must not include the capture of any black piece" (19). Fundamental Checkmates is far more comprehensive than the books I usually recommend. Moreover, as a historian I must acknowledge that Renaud and Kahn perpetuate errors, while Gude seeks to dispel misunderstanding.

Having opined in the Chess Book Collectors" group on Facebook that The Art of the Checkmate and 1000 Checkmate Combinations were far superior to other book on the subject, I was exposed to alternative views. Gude was mentioned right away. Later in the thread, someone mentioned a text that I did not know about, but that now occupies space on my bookshelf. George Koltanowski and Milton Finkelstein, Checkmate!: The Patterns of the Winning Mating Attacks and How to Achieve Them (1978) will not find a place among those I recommend to beginners who will not take the time to learn English descriptive notation, nor benefit particularly from tracking down a now rare book that could be quite expensive. However, as I make time to read through it, it likely will present me with some new lessons for my students.

For most chess players willing to put in a little work, Renaud and Kahn remains a excellent choice. Soon, Henkin, 1000 Checkmate Combinations will be available, too. For those looking to work less, or seeking something easier for children, How to Beat Your Dad at Chess is worthy of attention. For those of who teach checkmate, Gude, Fundamental Checkmates is a valuable resource.



17 November 2021

Textbook Coordination

Black has a problem in this position, which could appear as part of the position in a game.

Black to move
White threatens Qxh7#

White's four pieces are well-coordinated for the final assault on the king. A position like this one could arise with additional defensive resources that would tip the balance in Black's favor. Without them, Black is near lost.

I put this position on the demonstration board at the start of the lesson for my after school chess club on Tuesday, noting that White's light-squared bishop could be anywhere along the diagonal from a2 to d5. We looked at several possibilities for Black's defense and White's attack, most leading to either checkmate or the loss of Black's queen.

Then, I showed the students two games. The first appears in several of Gioachino Greco's manuscripts, and is well-known from its inclusion in the usual databases. David Levy and Kevin O'Connell, Oxford Encyclopedia of Chess Games, Volume 1 1485-1866 (1981) has this as Greco 11 (2).

Greco,Gioacchino -- NN [C53]
Greco Europe, 1620*

1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.c3 d6 5.d4 exd4 6.cxd4 Bb4+ 7.Nc3 Nf6 8.0-0 Bxc3 9.bxc3 Nxe4 10.Re1 d5 11.Rxe4+ dxe4 12.Ng5 0-0 13.Qh5

Black to move
13...h6 14.Nxf7 Qf6

We also looked at 14...Rxf7, which is a better defense. This move and the subsequent 15.Bxf7 precede Greco, appearing in the Regole MS, which some scholars have credited to Giulio Cesare Polerio and dated to the late sixteenth century (see Peter J. Monté, The Classical Era of Modern Chess [2014], 158-160, 465.)

15.Nxh6+ Kh8

15...Kf8 was also examined by Greco, but is not so credited in the ChessBase database. The line appears as an annotation in Levy and O'Connell, as three variations appear in Professor Hoffman, The Games of Greco (1900). This line merits a separate post. It was not part of the lesson at the youth chess club.

16.Nf7+ Kg8 17.Qh8# 1-0

The second game had been played that morning.

Stripes,J -- Internet Opponent [C70]
Live Chess Chess.com, 16.11.2021

1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 b5 5.Bb3 Bb7 6.c3

Inaccurate?

6.0-0 Nf6 7.c3 Nxe4 8.d4 Na5 9.Bc2 is normal.

6...Bc5 

Probably a mistake.

7.0-0 Nf6 8.d4

Black to move
8...exd4

This move accelerates White's attack.

8...Bb6 9.Re1 d6 10.a4 0-0 has appeared in a game between masters.
8...Bd6 9.Bg5 is an engine suggestion.

9.cxd4 Bb6 10.e5 Nd5

Simply giving away the knight. Black's position is near hopeless already in any case.

10...Ng8 11.d5+-

11.Bxd5 0-0 12.Ng5 Bxd4

12...h6 may be the last chance.

13.Qh5

We arrive at the basic pattern from Greco and his predecessors.

Black to move

13...h6 14.Nxf7 1-0

My opponent resigned here.

The game might have continued 14...Rxf7 (14...Qe7 15.Nxh6+ Kh7 16.Nf5#) 15.Bxf7+ Kh8 16.Bxh6 and the engine points out that 16...Qg8 is the only move.


*The game appears in Greco's Godolphin manuscript, an undated MS from the London sojourn, so should be dated 1623. It also appears in several MSS 1624-1625 produced in France.

01 November 2021

Cultivating Error

Fast chess rewards weakness. Playing for cheap traps and succeeding stifles progress. Having spent many hours studying the games of Gioachino Greco, I have succeeded numerous times in replicating his best known miniature. This morning against a player with a Lichess rating near 2200, I found my opponent unprepared to meet the transparent threats offered in the not quite sound Greco Attack.

After this victory, and my postgame analysis, I decided that I have had enough. If I am to continue playing the Greco Attack, I must shift to the Aitken variation. Below is the game.

Stripes,J (2096) -- Internet Opponent (2153) [C54]
Rated Rapid game lichess.org, 01.11.2021
[Stripes,James]

1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.c3 Nf6 5.d4 exd4 6.cxd4

6.e5 is better, according to William Lewis, Gioachino Greco on the Game of Chess (1819), which Lewis presents as a translation of a French collection of Greco's games.

6...Bb4+ 7.Nc3?!

7.Bd2 Nxe4 8.Bxb4 Nxb4 9.Bxf7+ Kxf7 10.Qb3+ is in the Ordini manuscript (1594) from the Polerio-complex. See "Greco Attack Before Greco".

7...Nxe4=/+ 8.0-0

Black to move
8...Nxc3

8...Bxc3 9.d5 is in Greco's Mountstephen manuscript (1623). It is the better move.

9.bxc3 Bxc3

The equalizing 9...d5 does not seem to appear among late-sixteenth century or seventeenth century manuscripts. It was played by Moller in 1902, according to ChessBase Mega 2020.

10.cxb4 dxc4 11.Re1+ Ne7 with equal chances: 0-1 (48) Piotrowski,O-Moller,J Hannover 1902.

White to move
10.Qb3?

I play this move because I get away with it. I have even told students, erroneously, that White is now winning.

10.Ba3 is Aitken's suggestion 10...d5 11.Bb5 Bxa1 12.Re1+ Be6 13.Qc2 Qd7 14.Ne5+-. See also Corte -- Bolbochán 1946 (2016).

10...Bxa1??

Now Black is lost. Black is also lost after 10...Bxd4, which also appears in Greco.

10...d5 11.Bxd5 0-0+/= (11...Bxa1?? 12.Bxf7+ Kf8 13.Ba3+ Ne7 14.Re1+- is credited to Don Antonio in the Doazan manuscript, which precedes Greco. Greco may have seen this manuscript.)

11.Bxf7+ Kf8 12.Bg5 Ne7 13.Ne5!

Greco's innovation, building on the work of Polerio and his associates.

Black to move

Greco analyzes several variations from this point. This game follows one of them.

13...Bxd4 14.Bg6 d5 15.Qf3+ Bf5 16.Bxf5 Bxe5 17.Be6+ Bf6 18.Bxf6 Qe8N

Black's move is the first new one.

White to move
19.Be5+ 

My last move misses checkmate in three. Nonetheless, Black resigned.

19.Bg5+ (or Bh4+) 19... Nf5 20.Qxf5+ Qf7 21.Qxf7#

I won because my opponent missed several well-known opportunities. 10.Ba3 avoids some of these.