Showing posts with label Encyclopedia of Chess Combinations. Show all posts
Showing posts with label Encyclopedia of Chess Combinations. Show all posts

10 January 2017

Alekhine -- Levenfish 1912

Reading Alexander Alekhine's Best Games (1996) this morning, I became caught up studying a miniature. Alekhine -- Levenfish, St. Petersburg 1912 was decided in nineteen moves. Naturally, Levenfish's errors merit attention for anyone who plays the Benoni Defense, and perhaps also for players of the Modern.

After 14...Qxb2
Alekhine,Alexander -- Levenfish,Grigory [A43]
St Petersburg Winter-B St Petersburg, 1912

1.d4 c5

Alekhine criticizes this move, claiming, "White at once obtains a great positional advantage by simply advancing the centre pawns."

2.d5 Nf6 3.Nc3 d6 4.e4 g6 5.f4 Nbd7?!

5...Bg7 is the normal move.

6.Nf3 a6?!

With this move, this game becomes unique in the database.

6...Bg7 7.e5 dxe5 8.fxe5 Ng4 9.e6 fxe6 has been played at least eleven times. Alekhine gives this line to 9.e6, but then has 9...Nde5 10.Bb5+. His line has been played at least twelve times with ten White wins. It seems that 9...fxe6 may be better, although here, too, White has done well.

White to move

7.e5

White already has a clear advantage, according to Branko Tadic, and Goran Arsovic, Encyclopedia of Chess Miniatures (2015), where this game is number 166. Irving Chernev, The 1000 Best Short Games of Chess (1955) has it as well, but the annotations are limited to the last two moves. Tadic and Arsovic mark Black's fifth and sixth moves as dubious. Anyone seeking to play this line as Black would be well to note the urgency of playing Bg7 straight away.

7...dxe5 8.fxe5 Ng4 9.e6

Searching positions with 6...Bg7 in the ChessBase database this morning brought up several games that reached the position via a move order from the Modern Defense. White did well in those games, too, and this e5-e6 thrust was frequently played in those games.

9...Nde5 10.Bf4

Black to move

10...Nxf3+

Black might have tried 10...Bg7. Here Tadic and Arsovic offer 11.Nxe5 Nxe5 12.Qe2 with advantage for White. For his part, Alekhine offers 11.Qe2 Nxf3+ 12.gxf3 Nf6 13.exf7+ Kxf7 14.O-O-O "with an overwhelming advantage for White." John Nunn, who converted Alekhine's games to algebraic and culled from the two volumes of My Best Games to produce Alexander Alekhine's Best Games, suggests an improvement for Black in the line Alekhine gives. Instead of 12...Nf6, Nunn recommends 12...Bxc3+ 13.bxc3 Qxd5 as "more testing". But even here, White gets a strong attack with 14.fxg4! Qxh1 15.O-O-O Qc6 16.exf7+ Kxf7 17.Bg2.

11.gxf3 Nf6 12.Bc4 fxe6

While my coffee was still hot this morning, I spent a little time looking at 12...b5 13.Nxb5 axb5 14.Bxb5+. White ends up a pawn ahead with a strong position.

13.dxe6

Black to move

13...Qb6

Alekhine presents the alternative 13...Qxd1+ 14.Rxd1 Bg7 15.Bc7 O-O 16.Bb6, where, "White wins a pawn, at the same time maintaining all his pressure."

13...Qa5 might be playable, although White still has an edge.

The computer likes Black's move until it sees Alekhine's brilliant fifteenth move.

14.Qe2! Qxb2?

Tadic and Arsovic give 14...Bg7 15.O-O-O with a clear advantage for White. Certainly, Black's last chance was to resist the poisoned pawn.

15.Nb5!!+-

Black to move

Alekhine's double rook sacrifice had to be calculated before playing 14.Qe2. Black, too, needed to see the consequences in order to avoid 13...Qb6

15... Qxa1+

Perhaps Black can survive with 15...Bg7 16.O-O-O O-O 17.Bd6!

Now, we have finish that is reminiscent of Anderssen's Immortal Game.

16.Kf2 Qxh1 17.Nc7+ Kd8 18.Qd2+ Bd7 19.exd7 1–0

Black can delay, but no longer prevent checkmate.

24 February 2016

Clearance

This morning's thirty minutes of tactics was nine problems in Encyclopedia of Chess Combinations, 5th ed. (2014). Problems 352-360 begin the Basic portion of those classified as Clearance. Three problems took more than five minutes each.

White to move

No. 354 Urosov -- Kalinsky, corr. 1880.

Black to move

No. 358 Von Feilitzsch -- Wildegans, corr. 1939.

Black to move

No. 359 Gomes -- Netto, Rio de Janeiro 1942.

18 January 2016

Wei Yi

Tata Steel Chess 2016, Round Three

After two rounds, the leaders in the Masters Group of this year's tournament in Wijk aan Zee are Wesley So, Fabiano Caruana, and Ding Liren. Nonetheless, the focus today will be on the first game between current World Champion Magnus Carlsen, and probable World Championship contender, Wei Yi. Wei Yi is sixteen years old, the current youngest Grandmaster, and last summer won a game that many analysts have claimed is the best game of the twenty-first century.

In late December at Inland Chess Academy's Holiday Chess Camp after dismissing my young students for the lunch break, I walked into the classroom next door where FM Jim Maki was conducting camp for the advanced group. He had this position on the projection screen.

White to move

Seeing this position, I claimed to have seen it in the Encyclopedia of Chess Combinations, where it cannot be found. Maki pointed out that it is not there, yet. It could not be as it had been played several months after the latest edition of the Encyclopedia was published. I was probably remembering a position from Ragozin -- Veresov, Moscow 1945. The position above is from Wei -- Bruzon Batista, Danzhou 2015, Chess Informant 125/65. I had looked at Wei Yi's beautiful game last summer. The intuitive sacrifice on f7 is a familiar pattern, but is far less clear in this position than in Ragozin's game. There have been many instances of such a sacrifice, several of which are elucidated in Grigory Serper, "From Paul Morphy to Wei Yi," Chess.com (19 July 2015), http://www.chess.com/article/view/from-paul-morphy-to-wei-yi.

Not only this game, but Wei's rapid ascent, has created a great deal of anticipation of his coming battles with Carlsen. The young Chinese player will not dethrone the World Champion today because that is not how it works. But, he could score a symbolic victory. I predict a fighting draw. But, today's battle offers a first glimpse of more battles to come.

Magnus Carlsen is the strongest player ever to sit at a chess board. His style is torturous, rather than flashy. Wei's approach, on the other hand, reflects a hunger for tactical fireworks. Today, we will see a battle of styles as well as the current World Champion defending his position against one of his possible successors.

Wei,Yi (2706) -- Carlsen,Magnus (2844) [C89]
Tata Steel Chess Wijk aan Zee (3), 18.01.2016

1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.0–0 Be7 6.Re1 b5 7.Bb3 0–0 8.c3 d5

The Marshall!

Carlsen previously has played 8...d6 9.h3 Nb8 10.d4 Nbd7 11.c4 c6 12.Nc3 b4 13.Na4 c5 14.d5 Re8 15.Bc2 Nf8 16.a3 a5 17.b3 Ng6 18.Nb2 Bd7 19.Nh2 h6 20.Nf1 Nh7 21.Ne3 Bg5 22.axb4 axb4 23.Rxa8 Qxa8 24.Nf5 Bxc1 25.Qxc1 Bxf5 26.exf5 Ngf8 27.Nd1 Nf6 28.f3 Qa2 29.g4 Ra8 30.Nf2 Qa3 31.Qb1 Qa2 32.Qc1 Qa3 33.Qb1 Qa2 34.Qc1 ½–½ Nakamura,H (2774) -- Carlsen,M (2815) Medias 2011.

9.exd5 Nxd5 10.Nxe5 Nxe5 11.Rxe5 c6 

White to move

12.d3

12.d4 has been more popular. 12.d3 was first played by Vassily Smyslov in 1949.

12...Bd6 13.Re1 Bf5 14.Qf3 Qh4 15.g3 Qh3

White to move

16.Be3

A relatively rare move.

16.Bxd5 has been most frequent.

16...Bxd3 17.Nd2 Qf5 18.Bd4 Rae8 19.Kg2 Qxf3+

19...h6 20.a4 Qxf3+ 21.Kxf3 Re6 22.axb5 axb5 23.Kg2 Rfe8 24.Rxe6 Rxe6 25.c4 bxc4 26.Nxc4 Be4+ 27.f3 Bd3 28.Nxd6 Rxd6 29.Kf2 Rd7 30.Ra3 Nc7 31.Be3 Nd5 32.Bc5 f6 33.Ba4 Bb5 34.Bc2 Nc7 35.Bg6 Na6 36.Re3 Rd8 37.Be7 Rc8 38.b4 c5 39.Bf5 Rc6 40.Bd7 cxb4 41.Bxc6 Bxc6 42.Re6 1–0 Vachier Lagrave,M (2731) -- Adams,M (2740) Biel SUI 2015.

20.Kxf3 Re6

Wei has gone into a long think.

White to move

21.Rac1

21.a4 might have been expected, as it is a common idea when playing against the Marshall. The threat to play c4, however, seems to complicate this position.

21...h6

Yasser Seirawan had commented on the absence of this move earlier. The rook could go to h6, provoking White to play h4, a possibly weakening move.

22.Kg2 Rg6 23.Ne4 Nf4+ 24.Kf3 Bxe4+ 25.Rxe4 Nd3 26.Rd1

I would have played 26.Rc2, which my engine tells me is a slight inaccuracy. The computer likes 26.Rb1, a move that Seirawan also mentioned.

26...Nxb2 27.Rd2 Ba3

White to move

28.Bb6 Rd6

Seirawan looked at 28...c5 29.Ba5 c4 30.Bc2 Nd3 and also other lines prior to 28.Bb6 where Black's queenside pawns become separated. At this point in the game, or a few moves earlier, it appeared that Wei had some chances to play for a win.

29.Rxd6 Bxd6 30.Re2 Nd3 31.Rd2 Ne5+ 32.Kg2 Be7 33.f4 Nc4 34.Bxc4 bxc4 

White to move

Black's pawns have become separated after all, but with substantially less material on the board, their weaknesses do not offer White much.

35.Rd7 Bf6 36.Rc7 Bxc3 37.Rxc6 Rb8 38.a4 Bb2 39.Ba5 c3 40.Bxc3 Bxc3

Both players have reached the time control.

41.Rxc3

Black to move

A few years ago, I would have suggested that this position should be a simple draw. However, Carlsen became the World Champion by squeezing blood from turnips. If there is anything to play for, any resource in the position, Carlsen will make his opponent play on. His opponents usually find themselves in time pressure and occasionally crack.

41...Rb4 42.a5 Rb5 43.Ra3 Rb2+ 44.Kh3 f5 

White to move

Although this position should be objectively drawn, it is worth noting that Black's rook is more active, his king is more active, and it is possible for the White king to blunder into checkmate (I have been on both sides of that particular checkmate in many a blitz game).

45.Rc3 Rb5 46.Ra3 g5 47.fxg5 hxg5 48.Kg2 Kg7 49.h4 g4 50.Rc3 Rxa5 51.Rc6 Ra2+ 52.Kg1 a5 53.Ra6 a4

White to move

54.Kh1 Kf7 55.Kg1 Ra1+ 56.Kg2 Ra3 57.Kh2 Ra2+ 58.Kg1 Ke7 59.Kh1 a3 60.Kg1 ½–½


David Navara!

While trying to sort out the possibilities in the endgame for Wei and Carlsen, David Navara created some excitement with a rook sacrifice against Anish Giri. My attention was diverted to Navara's game after Carlsen's 20...Re6.

Navara,David (2730) -- Giri,Anish (2798) [D97]
Tata Steel Chess Wijk aan Zee (3), 18.01.2016

1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.Nf3 Bg7 5.Qb3 dxc4 6.Qxc4 0–0 7.e4 a6 8.Be2 b5 9.Qb3 c5 10.dxc5 Bb7 11.e5 Nfd7 12.Be3 e6 13.0–0 Qc7 14.Rad1 Nxc5 15.Qa3 Ne4 16.Nxe4 Bxe4 17.Ng5 Bc6 18.f4 Qb7 19.Bc5 Re8

White to move

20.f5! exf5 21.Rxf5 gxf5 22.Bh5 Bd5 23.Rxd5 Qxd5 24.Bxf7+ Qxf7 25.Nxf7 Kxf7

White to move

26.Qb3+ Kg6 27.Qg3+ Kf7 28.Qb3+ Kg6 29.Qg3+

Such a repetition could prove useful for reaching the time control before a difficult endgame.

29...Kf7 30.Qf3

30.Bd4 was examined by Seirawan during the commentary and may have been Navara's best chance to win.

30...Nd7 31.Qd5+ Kg6 32.Qc6+ Nf6 33.exf6 Rac8 34.Qxa6 Ra8 35.f7+ Kxf7 36.Qxb5 Rad8 37.Qb3+ Kg6 38.Qg3+ Kf7

Navara is essentially playing on the increment at this point in the game.

White to move

39.Qb3+ Kg6 40.Bd6?

40.h4!

Bxb2 41.Qxb2 Rxd6 42.h3 Ra6 ½–½

Giri dodged a bullet. After the forcing continuation initiated by 20.f5! both players faced a position with difficult imbalances. Giri managed to stay ahead on the clock and Navara was unable to take advantage of his inaccuracies. I hope to see this game with detailed analysis in Chess Informant 127.

The decisive games in the round came when Shakhriyar Mamedyarov blundered a rook in a winning position to Pavel Eljanov. In his postgame interview, Eljanov seemed relieved to have escaped without a loss but did not enjoy such a win. Fabiano Caruana also managed to grind out a win against Michael Adams, which now puts Caruana in sole possession of first place with ten rounds remaining. It is a long tournament.

12 March 2015

Lesson of the Week

My chess lessons this week have been tailored for different groups and individuals.

Beginners

Watching one of my young pupils chase a lone king with a queen and a knight until I, as the tournament director, stepped in and called the game drawn by the fifty move rule influenced my choice of lessons for the groups comprised mainly of beginners. Two after school clubs worked on elementary checkmate with queen and king vs. lone king (see "Teaching Elementary Checkmates").

Advanced

Last Thursday, my copy of the Encyclopedia of Chess Combinations, 5th ed. (2014) arrived. I immediately put it to work. My advanced club that meets on Thursday afternoon was offered some incentive to work through the first six problems in the volume. Two students took home chess books after solving all six correctly in one hour's labor. At the March Madness youth tournament on Saturday, I created a problem solving contest featuring eight problems from this text. The two participants who scored best (four correct answers) each won a copy of John Nunn's Chess Puzzle Book.

One of these two winners meets with me on Wednesday afternoons for individual lessons. We spent a fair portion of our time looking at some of the tactical alternatives at two critical positions in Bird -- Morphy, London 1858 (see "Hitting the Books"). An abbreviated version of this exercise will be used today and tomorrow with other groups and individuals.

Bird,Henry Edward -- Morphy,Paul  [C41]
London, 1858

1.e4 e5 2.Nf3 d6 3.d4 f5 4.Nc3 fxe4 5.Nxe4 d5

White to move

6.Ng3?

White should have sacrificed the knight on e4 for an attack. 6.Nxe5!

6...e4 7.Ne5 Nf6 8.Bg5 Bd6 9.Nh5 0–0 10.Qd2 Qe8 11.g4 Nxg4 12.Nxg4 Qxh5 13.Ne5 Nc6 14.Be2 Qh3 15.Nxc6 bxc6 16.Be3 Rb8 17.0–0–0 Rxf2!

17...Bg4 should win easily. The merits of Morphy's brilliant attack are measured by White's defensive resources that Bird missed in the next diagram.

18.Bxf2 Qa3 19.c3 Qxa2 20.b4 Qa1+ 

White to move

21.Kc2?

After 21.Kc1, Black has a draw by repetition. Does Black have anything better? This position is worth playing out with a teacher or fellow student.

I like 21...a5, which Garry Kasparov claims is unclear. Kasparov suggests 21...Bf5 with a slight advantage for Black.

21...Qa4+ 22.Kb2 Bxb4 23.cxb4 Rxb4+ 24.Qxb4 Qxb4+ 25.Kc2 e3 26.Bxe3 Bf5+ 27.Rd3 Qc4+ 28.Kd2 Qa2+ 29.Kd1 Qb1+ 30.Kd2 Qxh1 0–1

06 March 2015

Sacrifice Everything

Black to move

This position is Problem 12 in Encyclopedia of Chess Combinations, 5th ed. (2014), published by Šahovski Informator (Chess Informant). For the past several years, I have been enjoying the electronic edition of Anthology of Chess Combinations, 3rd ed (2005) and will continue to do so. The Anthology was part of my selection with credit that I received for placing fifth in a Chess Informant Reader's Contest (see "Best of the Best: Chess Informant Reader's Contest").

There are many benefits to electronic books. They are light weight and require minimal storage space. The electronic edition of Anthology of Chess Combinations includes a "solver's kit"--a software interface with search capabilities and other features. Solving positions onscreen makes using the Anthology simple. See my review at "Anthology of Chess Combinations".

Print books still have their merits in this electronic age. With a pencil, I can track how I did on each problem and when I solved it (or failed). If I put the book away for a couple of months, my bookmark will remain in place and I can resume where I left off. In my review of the Anthology, I noted that tracking completed problems was the most important feature absent from the software.

The Encyclopedia, 5th edition adds approximately 300 problems over the total in the Anthology, 3rd edition. The organization of problems has changed somewhat. Morphy's famous queen sacrifice (see "Morphy's Immortal") was the first problem in the electronic edition of the Anthology and appears as number 191 (the first of the advanced in the annihilation of defense section) in the Encyclopedia.

I ordered the Encyclopedia last week and qualified for free shipping because I added the Informants missing from my collection. It arrived yesterday. I am happy!

I correctly solved the problem in this post in two or three minutes.