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Up Topic Rybka Support & Discussion / Rybka Discussion / Leiden 2007 short report by Jeroen
- - By Venator (Bronze) [nl] Date 2007-10-28 22:12 Edited 2007-10-28 22:38
Hi all,

Just returned home from Leiden, where Rybka won the 27th Dutch Open tournament. Again I had an enjoyable long weekend over there, so it is time to write a short report about it.

Round 1: Rybka - XiniX 1-0
Our opponent answered 1.e4 by 1... a6 and it took Rybka a long time to get something tangible against the dubious black defence. Black lost a lot of time in the opening, but apparently there was no clear way to punish this. Around move 25 XiniX finally made some mistakes and when it missed 28.h4! the black position rapidly went downhill.

Round 2: Diep - Rybka 0-1
A Grunfeld defence, where I deviated from the Na6-line we played against The Baron in May. Diep chose 10.Be3 and 11.e6 which IMO is not the critical test for black. On the contrary, black not only easily equalised, but after the bad move 17.Rc1? firmly took the initiative. Eventually Rybka won a pawn on b2 and had no trouble in bringing the point home.

Round 3: Rybka - Hiarcs 1-0
Of course I was very pleased with the opening selection of the Hiarcs team, walking directly into some well prepared Najdorf stuff. 23.Rh3! is the move 'that takes all the fun out of it for black' according to GM Svidler, and I think he is right. 26.Qf2 was the last book move and Hiarcs responded with the dubious 26... f6?! where IMO 26... Rxg2 is the only move. In that case we would have seen some more book moves, but in any case black is struggling. Rybka activated all her pieces in a nice way and after another error by Hiarcs she netted a piece and the game. Rybka only used around 25 minutes for this game, quite remarkable.

Round 4: The King - Rybka 0-1
The King played well in this tournament and uncorked a 6.Bg5 Najdorf. Now to prevent a lot of drawing possibilites I chose a slightly inferior line, avoiding the Poisoned Pawn. The King did a good job and had a slight edge for some time, but Rybka's 21... Qe7! was excellent, setting up the threat Rxc3! The King temporarely sacrificed a pawn and to my delight we saw the same passed pawn configuration as against Zappa in the 9th matchgame. Very clever was The King's 44.Qe4! hoping for 44... Rh2 45.d6! Rybka did see this in time and after The King allowed an exchange of queens the passers made the day. An interesting game.

Round 5: Rybka - Spike 1-0
A slightly dubious Ruy by Spike (9... a5) left Rybka with a +0,40 advantage out of book. Black sacrificed two pawns for activity and pressure, but it was already clear that this could not be enough. Rybka cleverly disentangled (Re1-e2-e1-f1! was pretty) and threw Spike into the defensive, with still 2 pawns to her credit. An astonishing easy win.

Round 6: Junior - Rybka 1-0
Just before Leiden started I discovered a flaw in my preparation for the Junior game as black. I consulted Dagh and the problem was quite serious. Dagh spent 2 nights trying to repair the damage, but to no avail. Now what to do? I had three black replies against 1.e4 prepared for Leiden. One of them I was surely not going to use against Junior, so there was the Zaitsev remaining or my intented prepared line. Here is one of the big dilemma's a book expert is facing: what choice to make? Should I trust that Junior doesn't know about the flaw or will not find it? Or put my faith in the Zaitsev, which was not intended? I chose the latter option and alas, regretted it afterwards. I think the chance Junior might blow up my intended line was less than 10%, but we never know that of course. So once again the Zaitsev, which gave us no sweet memories sofar. To keep winning chances in the 12.a3 line I had prepared the off beat 15... c6!? to prevent stuff like d5 and Na5. Then black has to give up his white squared bishop by playing c7-c6 with zero chances for a win. At least 15... c6!? keeps the pawn structure flexible and prevents mass piece exchanges. Unfortunatelty Rybka quickly followed it up with the dubious plan 21... exd4 and 22... d5, winning rook and 2P for 2 pieces. But this was more to white's liking and Junior played very well after this trade.

Round 7: Rybka - Crash Test Dummy 1-0
Crash Test Dummy is a cleaner and simpler version of The Baron and did well this tournament, by drawing Hiarcs f.e. It played the same dubious hedgehog system as Zappa in game 10 in Mexico, but this time the damage was even bigger. 21.c7 was first move out of book, with a +1,18 score. As CTD played many moves Rybka expected, Rybka used only 10 minutes to complete this game. A pretty win.

Round 8: Isichess - Rybka 0-1
This time I was not satisfied with my opening choice, nicely tricked by Isi using 4.e3! to make it a Nimzo. As I always make a special tournament version of my private book, I must skip the lines I don't want to play and exactly here this was forgotten. So Rybka chose from 2 Nimzo lines and ended up in a position in which Isichess could make a draw by perpetual. Fortunately it thought it was better and after the passive moves 25-27 Rybka took the initiative. The game ended with some spectacular tactics, especially 38... Qe8!! was great. Amazing how quickly things went wrong for white after move 25. The biggest upset of this round was Juniors loss against Zzzzzz, after which I made a joke to its author that he should challenge Rybka for the next ultimate computer challenge :-).

Round 9: Hermann - Rybka 0-1
An offbeat opening by Hermann, that went quickly wrong after white sidelined its knight by 14.Nh4. With the strong 18... d5! Rybka took the initiative and easily outplayed her opponent. Funny was the end of the game: when it was mate in 8, Rybka so much liked her position, that she took 1 minute for each next move to complete the mating sequence!

All in all I was satisfied with another Rybka victory. Apart from the game against Junior things went smoothly and I was especially pleased with the book win over Hiarcs. Once again we saw Rybka outclassing the opposition, that lost too many (half) points to make it close. Somehow it is weird you lose to Junior and still have 2 points more in the final standings. OK the Junior loss was painful, but I must admit I forgot about it after the Zzzzzz-Junior game :-). I hope you enjoyed it!
Parent - By NATIONAL12 (Gold) [gb] Date 2007-10-28 22:27
excelant and informative report. but i agree with turbojoice whats with sticking to the have a better prog get them out of book in complicated positions where rybka performs best.
Parent - - By Nick (****) [gb] Date 2007-10-28 23:29
Great report Jeroen - thanks!   I thought the Hiarcs book builder (Sebi?) might try something like this after 23. Rh3 :)

1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Be3 e5 7. Nb3 Be6 8. f3
Be7 9. Qd2 O-O 10. O-O-O Nbd7 11. g4 b5 12. g5 b4 13. Ne2 Ne8 14. f4 a5 15. f5
a4 16. Nbd4 exd4 17. Nxd4 b3 18. Kb1 bxc2+ 19. Nxc2 Bb3 20. axb3 axb3 21. Na3
Ne5 22. h4 Ra4 23. Rh3 Qa8 24. Qd5 Rxa3 25. bxa3 Qxa3 26. Qd2 Qa8 27. Qg2 b2
28. Qxb2 Qxe4+ 29. Qc2 Qb7+ 30. Kc1 d5 31. Bd4 Nc6 32. Bb2 Nb4 33. Qb3 Nc7 34.
f6 Bd6 35. fxg7 Rb8 36. h5 Ne6 37. g6 Nc5 38. gxh7+ Kxh7 39. g8=Q+ Kxg8 40.
Rg3+ Kf8 41. Bg7+ Ke7 42. Re3+ Kd7 43. Qb1 Ne4 44. Rd2 Kd8 45. Kd1 Nxd2 46.
Kxd2 d4 47. Bxd4 Qd5 48. Qe4 Qa2+ 49. Kd1 Nd5 50. Bd3 f5 51. Qh4+ Kc7 52. Rf3
Qa4+ 53. Kc1 Rb4 54. Qf2 Rxd4 55. Qc2+ Qxc2+ 56. Bxc2 Rf4 57. Rh3 Rf1+ 58. Kb2
Nf4 59. Rh4 Be5+ 60. Ka3 Rf3+ 61. Ka2 Nd5 62. Kb1 f4 63. Rh1 Rf2 64. Re1 Bc3
65. Rc1 Nb4 66. h6 f3 67. h7 Rxc2 68. Rxc2 Nxc2 69. Kxc2 f2 70. Kxc3 f1=Q 71.
Kd4 Kd6 72. Kc3 Kd5 73. h8=Q Qa1+ 74. Kd2 Qxh8 75. Ke3 Qf6 76. Kd2 Qf3 77. Kc1
Kc4 78. Kc2 Qe2+ 79. Kb1 Kb3 80. Ka1 Qd1# 0-1
Parent - By staylor (***) [il] Date 2007-10-29 02:12 Edited 2007-10-29 02:14
OK, so Rybka KNEW about the weakness which MIGHT have been exploited by Junior, and IF it had not been, then Rybka MIGHT have won that game too.
But, still 8/9 is a good enough result, and if not for that problem, in which case Rybka might have looked entirely invincible, one wonders what would have happened if Zappa were there too.
"Too many mights"?

(This post was meant to appear under top post. Sorry)
Parent - By Venator (Bronze) [nl] Date 2007-10-29 11:06
Interesting! I'll take a look at it. Thanks for the game.

Best regards, Jeroen
Parent - By Arrière Pensée (Gold) Date 2007-10-29 00:53 Edited 2007-10-29 00:58
Hi Jeroen,

Thank you for the background info, it is always nice to know what went on behind the scenes; especially when it is coming from an integral member of the Rybka Team- Thanks for your hard work.

P.S. Thanks also for showing me that I had unfounded fears about Spike! :-)

sidserious-( Jung once told Hesse (and I paraphrase) if I cure you of your demons I also will take away your angels) such is the plight of a neurotic! 
Parent - - By BB (****) [gb] Date 2007-10-29 02:09
OK the Junior loss was painful, but I must admit I forgot about it after the Zzzzzz-Junior game

It couldn't have been as painful as 52-7 for the Patriots. First loss to them (regular season that is, pre-season 2006 was 41-0) in 35 years. What is Vas's recovery time for this?
Parent - By Vasik Rajlich (Silver) [us] Date 2007-10-29 03:06
The margin doesn't really matter. Every loss is a bad loss (the corrolary: every win is a good win).

Parent - By turbojuice1122 (Gold) [us] Date 2007-10-29 02:13
Thank you for an informative report, especially the "behind-the-lines" talk about the Junior game preparation.  Congratulations to the Rybka team on another big tournament win!  Now to try to prevent programs from tricking Rybka into playing such silly lines as C90-99 with black...
Parent - By Vasik Rajlich (Silver) [us] Date 2007-10-29 03:01
Thanks Jeroen, this made my report a lot easier to write :)

Parent - - By Laszlo (***) [fr] Date 2007-10-29 14:09
Thank you for the report game by game. Could you send us an overall table of tournament?

(Let's forget the Zaitzev, Shirov's chessbase dvd on "My best Ruy Lopez games"... condamn it.)
Parent - - By Venator (Bronze) [nl] Date 2007-10-29 14:36

Best regards, Jeroen
Parent - By Laszlo (***) [fr] Date 2007-10-29 17:08
Parent - - By Sellig1947 [fr] Date 2007-10-29 18:37
Thanks Jeroen for the link.
Question: where are all the tournament games (not just Rybka's) for downloading ? I do not see any link.
Parent - - By Harvey Williamson (*****) Date 2007-10-29 18:56
Question: where are all the tournament games (not just Rybka's) for downloading ? I do not see any link.

On The Hiarcs Forum of course :-)
Parent - By Banned for Life (Gold) Date 2007-10-29 19:10
Harvey has stolen a march on us once again. Thanks!

Parent - By noctiferus (***) [it] Date 2007-10-29 19:48
Parent - By Fulcrum2000 (****) [nl] Date 2007-10-29 20:21 Edited 2007-10-29 20:25
It's a little bit hidden, but here you go:

copy it in the browser bar (do not click it)
Up Topic Rybka Support & Discussion / Rybka Discussion / Leiden 2007 short report by Jeroen

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