The Rybka4 Book – a treasure trove for tournament players (Part 2)

6/28/2010 – A week ago we published an interview with Jiri Dufek, the author of this powerful and very useful openings book. Jiri told us how it was made and what it was useful for. The final question to him was: "Can you show us a few interesting novelties from the book?" His answer: "Sure…" Today he gives us a small sample of ideas and discoveries found in the Rybka4 book. Take a deep breath.

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Sample of ideas and novelties in the Rybka4 Book

In the second part of his interview Jiri Dufek describes some of the novelties and ideas he has discovered while preparing the Rybka4 Book. Naturally they are all included on the DVD.


I must start with my the oldest novelty from 2004. This line is now out of fashion and I cannot wait any more.
1.Nf3 Nf6 2.c4 g6 3.Nc3 d5 4.Qa4+ c6 5.cxd5 Nxd5 6.Qd4 f6 7.e4 e5 8.Nxe5 Nxc3 9.Qxc3 Qe7 10.Nf3 Qxe4+

11.Kd1! +=


The Hedgehog is very popular at all levels. However latest research shows that Black is facing lot of problems. 1.c4 c5 2.Nf3 Nf6 3.Nc3 e6 4.g3 b6 5.Bg2 Bb7 6.O-O Be7 7.Re1 a6 8.e4 d6 9.d4 cxd4 10.Nxd4 Qc7 11.Be3 Nbd7 12.Rc1 O-O 13.f4 Rfe8 14.g4 Nc5 15.Bf2 g6 16.b4 Rad8



1.c4 c5 2.Nf3 Nf6 3.Nc3 e6 4.g3 b6 5.Bg2 Bb7 6.O-O Be7 7.Re1 a6 8.e4 d6 9.d4 cxd4 10.Nxd4 Qc7 11.Be3 Nbd7 12.Rc1 O-O 13.f4 Rac8 14.Bf2 Rfe8 15.e5 Bxg2 16.exf6 Ba8 17.fxe7 Qb7 18.Kf1 Qg2+ 19.Ke2 e5 20.Rg1 Qh3



I am very big fan and supporter of the Benoni, but now the only top player who likes it is GM Vugar Gashimov. There is a recent theoretical book with interesting ideas in the Benoni, and I checked few of them. 1.d4 Nf6 2.c4 c5 3.d5 e6 4.Nf3 exd5 5.cxd5 d6 6.Nc3 g6 7.e4 Bg7 8.h3 a6 9.a4 Nbd7 10.Bd3 Nh5 11.O-O Ne5 12.Be2 Nxf3+ 13.Bxf3 Qh4

And now rook move 14.Ra3! looks very unpleasant for Black.


I wanted to pass over the Najdorf, but this was not possible of course. It was really a big torture for me. In the end I found a totally new way to play one of the main lines, which is now under great pressure. 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6 6.Be3 e6 7.f3 b5 8.Qd2 Nbd7 9.g4 Nb6 10.a4 Nc4 11.Bxc4 bxc4 12.g5 Nd7 13.f4 Qc7 14.O-O and now



I am very big French fan. However in the last months life for Black is not been easy. The reason: a little move by the bishop, and Black has problems to solve. 1.e4 e6 2.d4 d5 3.Nd2 Nf6 4.e5 Nfd7 5.Bd3 c5 6.c3 Nc6 7.Ne2 cxd4 8.cxd4 f6 9.exf6 Nxf6 10.O-O Bd6 11.Nf3 Qb6 12.Bf4 Bxf4 13.Nxf4 O-O 14.Qd2 g6



the Rybka4 Book contains full coverage of the Jaenisch Gambit – everything is engine-checked, and I made a lot of new analysis to support this opening. There are some “normal” positions from book:


From time to time I test my book on Playchess. I was surprised, where I found a very popular line.
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 Bb7 10.d4 Re8 11.Nbd2 Bf8 12.a4 h6 13.Bc2 exd4 14.cxd4 Nb4 15.Bb1 c5 16.d5 Nd7 17.Ra3 Nb6 18.a5 Nd7

This looks pretty dubious for Black, who however scored about 66% after the “normal” 19.Nf1 f5! For my eyes this setup was not so nice, and there had to be a simple solution. I think that I found it, even though it took more time than I anticipated: 19.Nh2! c4 20.Rg3! with very strong attack. You can check the full analysis after 19.Nh2 in the book.


The Queen Gambit Accepted is very popular nowadays. Very often the white players choose strange sidelines, because main line is holding. This is not true after 1.d4 d5 2.c4 dxc4 3.Nf3 Nf6 4.e3 e6 5.Bxc4 c5 6.0-0 a6 7.Bb3 b5 8.a4 b4 9.e4 Bb7 10.e5 Ne4 11.Nbd2 Nxd2 12.Bxd2 cxd4 13.Ng5 Be7 14.Qh5 Bxg5 15.Bxg5 Qd7

Now White has the subtle move 16.Rfd1! You can check that after 13.Ng5 Black's life is very hard.


The Botvinnik System has been a popular openings for last thirty years. The theoretical debate is getting deeper and deeper, and it looks as though we will soon be ending in some simple endgame. The Rybka4 Book includes the latest development in the line. After the moves 1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nc3 e6 5.Bg5 dxc4 6.e4 b5 7.e5 h6 8.Bh4 g5 9.Nxg5 hxg5 10.Bxg5 Nbd7 11.g3 Bb7 12.Bg2 Qb6 13.exf6 0-0-0 14.0-0 c5 15.d5 b4 16.Na4 Qb5 17.a3 Nb8 18.axb4 cxb4 19.Qg4 Bxd5 20.Rfc1 Nc6 21.Bxd5 Rxd5 22.Rxc4 Rxg5 23.Qd4 Kb8 24.Rxc6 Rxg3+ 25.fxg3 Qxc6 26.Rd1 Qc7 27.Kf1 Rh5 28.Qd8+ Qc8 29.b3 Rd5 30.Rxd5 exd5 31.Qxd5 Qa6+ 32.Kg2 Qe2+ 33.Kh3 Qf1+ 34.Kg4 Qe2+ 35.Kg5 Qe3+ 36.Kh4 Qh6+ 37.Kg4 Qg6+ 38.Kf3 Qxf6+ 39.Ke4 Bd6

your engine will show probably something around 0.00, but do you want this really play with Black over the board?


The system with Rb1 and Be2 in the Gruenfeld is still very dangerous for Black. Theoreticians very often like system with Be5-c7-a5, however in the last months Black has faced lot of trouble. I did my best to revitalize this line. 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.cxd5 Nxd5 5.e4 Nxc3 6.bxc3 Bg7 7.Nf3 c5 8.Rb1 0-0 9.Be2 Nc6 10.d5 Ne5 11.Nxe5 Bxe5 12.Qd2 e6 13.f4 Bc7 14.0-0 exd5 15.exd5 Ba5

For example 16.d6 Rb8 17.Ba3 Bf5 18.Rbc1 Rc8 19.Bf3 Qd7 20.Rcd1 Rfe8 21.Rfe1 Rxe1+ 22.Rxe1 Bd8 23.h3 h5 24.Bb2

24…c4! =


System with 7…a6 is the main weapon. One of the key position is after moves 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.Nf3 Bg7 5.Qb3 dxc4 6.Qxc4 0-0 7.e4 a6 8.e5 b5 9.Qb3 Nfd7 10.h4 c5 11.e6 c4 12.Qd1 Nb6 13.exf7+ Rxf7 14.h5 Nc6 15.hxg6 hxg6 16.Be3 Bf5 17.Ng5 Rf6 18.g4 Be6 19.Nce4 Bd5

However White now has a devastating idea: 20.Bg2! Nb4 21.Ke2!!+/–


The Catalan is very popular nowadays, and after the World Championship match between Anand and Topalov it will get more supporters. The Rybka4 Book contains a lot of ideas and novelties – here is one of them: 1.d4 d5 2.c4 e6 3.Nf3 Nf6 4.g3 dxc4 5.Bg2 c6 6.Ne5 Bb4+ 7.Bd2 Qxd4 8.Bxb4 Qxe5 9.Na3 b5 10.Bd6 Qxb2 11.0-0 Nd5 12.e4 Nc3 13.Qh5 Nd7 14.e5 Bb7 15.Qg5 f6 16.exf6 0-0-0 17.fxg7 Rhg8

18.Rae1 with attack.


The old Petrosian recipe in the Queen's Indian Defence is not popular nowadays, but from time to time Black wants to win at any price and is ready to take big risks. This is line: 1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.a3 Bb7 5.Nc3 Ne4 6.Nxe4 Bxe4 7.Nd2 Bb7 8.e4 Qf6 9.d5 Bc5 10.Nf3 Qg6 11.b4 Qxe4+ 12.Be2 Be7 13.0-0 Bf6

Mainly after 14.h3 exd5 15.Bd3 Bxa1 16.Bxe4 dxe4 17.Bf4 0-0 18.Nh2!

White has the upper hand.

The Rybka 4 Book by Jiri Dufek

The Rybka4 opening book is a high-class compilation of opening theory. It was developed for the world‘s strongest chess entity – a 100-core cluster running the program Rybka4, used to maximize the program‘s playing strength. The choice of variations in the openings book is well suited to the style of the program, and the book has been fine-tuned and checked in thousands of games.

The Rybka4 Book includes 17 million positions and over 700,000 games, which were selected from following sources: top human events, correspondence chess games and computer chess games (up to April 2010). And this is only the starting point: the value of the book lies in over 700 original analyses and move choices, which lead to a re-evaluation in many critical points of modern theory. This makes it useful for tournament and correspondence players alike.

The book contains a lot of computer checked analysis never published anywhere before. The author of the Rybka4 book is Jiri Dufek (national master, FIDE 2276, ICCF IM 2579), one of the world‘s leading experts in chess opening theory. Jiri Dufek has been on the Rybka team since summer 2009, and after this date his preparation was used in all official events which Rykba won. During World Championship match between Vishy Anand and Veselin Topalov Jiri worked as second of Veselin Topalov. In his long chess career he won twice Czech Correspondence Team Chess Championship and wrote together with Roman Chytilek book Beating the French Defence (in Czech only).

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