Thanks to the sponsor PAL GROUP from United Arab Emirates and Chess Base server “playchess” during the weekend 19 & 20 March 2006 - 150 chess players from around the world had fun and good chess training.  If you would like to read more about it – here is a very interesting report written by correspondence GM Arno Nickel, one of the participants: GM Nickel describes the technical issues and advantages of playing as centaur & unattended engine. From 150 participants only eight luckiest qualified to the final which took place on “playchess” on April 8 & 9. The prizes were amazing – much better that in open tournament (!) :  1. 8000 $  2. 4000 $  3. 2000 $  4-8 chess software of 1000$ value. Also the level of chess games was higher.

It is interesting issue how much computers are improving human play and vice versa.  The question - what and when is more important: human intuition or engine evaluation based mainly on calculation, is a question every Centaur Player (no matter what chess level he/she presents) has to answer during a game many times. If you want to see how difficult and complicated it may be – take a look at comments by GM Michal Krasenkow (2650 ELO) to the Zor_Champ – Rajlich game.

It is worth mentioning that like last year Centaurs took the first two places, but there is also a difference from the Free Style 2005 – this year to the final qualified 3 unattended engines. Is it because a year difference made it possible to get very fast hardware which was not in the “normal” price range a year before, or it was just luck or perhaps it was because of the engine strength improvement – I mean Rybka 1.1 release J. Honestly I think it was a combination of these factors J.

Except for buying great hardware and best engine or few best as you like, you can improve your chances to win games by choosing or making an opening book. Still engines are not great in openings – humans can improve the game level here a lot.

It will not be so much fun to play or watch only engine vs engine games, so Dear Centaurs get ready – new tournament according to some unofficial information is coming up in June!






Win with one point lead ! J


Chrilly Donninger creator of Hydra and maybe also: GM Christopher Lutz,  GM Talib Mousa   

… and perhaps also The Hydra Sponsor himself.







Is a chess game a draw? J

Being never in danger to lose a game we (Rybka engine+Krasenkow, Rybka engine+Rajlich, Rybka engine+Radziewicz) managed to win only two, but still it was a lot of fun and learning to us both about chess and chess engines (especially how to use them to analyze).

We would like to see the Free Style Internet Tournament take place more frequently with longer time control – which makes competition Human & Computer more interesting for the human players.







3. RELIC RYBKA 1.1 RybkaJ ! RybkaJ ! RybkaJ !



Darren DiAlfonso computer programmer from New Jersey, USA – played Rybka 1.1 on fast 64 bit machine. He took third and the prize of $2000.

To get to the final Relic had to win very hard tie breaks… (1 spot for 10 players from which 6 were unattended Rybkas like him).







Crushing Kings is my specialty! J

Björn Osterman from Sweden operated unattended Rybka 1.1
It looks to me that he has pretty good opening book.




by lukasd2009 CC




Overruling engine just in the right moment! J

IM Dennis Breder 2431 ELO, professional chess player and trainer from Germany, choose a “nunn” as his nickname.

The Nunn happened to play at least two nice sacrifices, which engines did not “see or prefer” at first glance…

- I mean in “low” depth… 15 or so… J


by Wine Diva CC



Vvarkey,Rybka 1.1 32-bit

7.5 / 8



6.0 / 8


Rajlich,Rybka 1.1

6.0 / 8



6.0 / 8



6.0 / 8



6.0 / 8


King Crusher,Rybka 1.1

6.0 / 8


Relic,Rybka 1.1

5.5 / 8



 Why not this time? J

  Vigi Varkey is a computer programmer from Bangladesh staying in London UK,

  who won qualifications with incredible score 7,5 from 8 (!) operating Rybka engine on 32 bits machine...

  For the final he had upgraded to 64-bit machine, but he had not enough luck to win this time.






Let’s give humans more time! J

Correspondence GM Arno Nickel is a great fan of playing as a centaur.

He wrote very interesting report about Free Style Chess on:

by T. Scott Carlisle CC




Cool opening sacrifices – that’s what matters! J

Equidistance is a Czech team who really like brave opening sacrifices especially from

I had to admit Equidistance can be very dangerous playing with white Morra Gambit

1.e4 c5 2. d4!? c:d4 3. c3! gives in my opinion excellent attacking possibilities for white and it is undervalued by nowadays theory.

For their report about qualifications click here:






Zor_Champ – Rajlich

CSS/Pal Freestyle Tourney Final (45+5) round 4


[comments by GM Michal Krasenkow]



1.e4 c5 2.Nf3 Nc6 3.d4 c:d4 4.N:d4 Nf6 5.Nc3 e5 6.Ndb5 d6 7.Bg5 a6 8.Na3 b5 9.B:f6 g:f6 10.Nd5 f5 11.Bd3 Be6 12.0–0 B:d5 13.e:d5 Ne7 14.We1 Bg7 15.c3 0–0 16.Qh5 e4 17.Bf1 Re8 18.Rad1 Ng6


However frightened you may be to sac a pawn in a computer-assisted game (something your engine - even Rybka - will hardly approve {editor comment: hrrmmm J}), your human evaluation is mostly correct! Black activates his pieces and obtains good chances for a kingside attack. 19.Q:f5 Re5 20.Qh3 Nf4 21.Qg3 Qf6 22.c4 b4 23.Nc2 a5 24.Qe3?! Underestimating Black's reply. [24.Qb3!? was interesting]


24...Nd3! 25.B:d3 e:d3 26.Q:d3 R:e1+ 27.R:e1 Q:b2 28.Ne3


White is a pawn up but Black's queenside pawns are very dangerous. Such double-edged positions are very difficult both for humans and computers. For humans - because of abundance of complicated variations. For engines - because they can hardly evaluate the strength of passed pawns correctly (unless they see the pawns queening by force, of course).  Black has 4 alternatives here:


A) 28…Qc3?!  Was played in the game and led to an equal endgame.


B) “Human move" 28...Re8 would be met by 29.Qb3;


C) 28...Q:a2 !? was interesting. We didn't dare to play this move as we couldn't come to a definite conclusion as for the credibility of Rybka's evaluation. It now seems to me that the position remained balanced. I'll not cite all complex variations, here is the one I like most: 29.Nf5 Qb2 30.Qg3


30…Rd8 (30...Qc3 31.Nh6+ Kh8 32.N:f7+ Kg8=) 31.Re8+ (31.h3!? a4 32.c5 is a real mess) 31...R:e8 32.Nh6+ Kh8 33.N:f7+ Kg8 34.Nh6+ Kf8 35.Q:d6+ Re7 36.Qd8+ Re8 37.Qd6+=;


D) However, 28...a4! was probably much stronger (perhaps winning). We rejected it because of 29.Nf5 Qc3


30.Qe3 (30.Qe4 b3 31.a3 b2 is favorable for Black as 32.N:d6 (32.N:g7 Rb8! 33.Rf1 K:g7 –+) doesn't work due to 32...Qe5! 33.Q:e5 B:e5 34.Ne4 (34.Nb5 Rc8 –+) 34...Rc8 35.c5 f5 –+) , which was evaluated in White's favor by Rybka. It's curious that after 30...Q:e3 31.f:e3 Bc3 (31...b3? 32.N:g7) 32.Rb1 (32.Rc1 b3! 33.a:b3 Bb2) 32...b3 33.a3 she still prefers White, not seeing 33...Bb4! (see diagram below) { editor comment: Rybka to find 33… Bb4 needs 14 ply search, or 22 seconds on top hardware.}.

WHITE TO MOVE (after 33... Bb4!)

(Rybka's evaluation is immediately reversed once this move is shown to her!) 34.a:b4 a3 –+ Obviously, Rybka's calculating algorythm should be adjusted.]  Back to the game: 29.Q:c3 B:c3 30.Rb1


30… a4?! Missing another chance: [ 30...Rc8! 31.Rd1 (31.Rc1 a4 32.Kf1 a3 33.Ke2 Bb2 34.Rd1 b3 35.a:b3 Rb8 with better position for black; 31.Kf1 Bd2 32.Ke2 B:e3 33.K:e3 R:c4 with a superior rook ending) 31...a4 32.Kf1 Rb8 (32...a3? 33.Rd3; 32...b3?! 33.a:b3 a3 34.Nc2 a2 35.Ke2 Ra8 is something any engine can hardly evaluate.) 33.Ke2 b3 34.a:b3 a3 35.Nc2 R:b3 36.c5 Kf8 keeping winning chances - again too difficult for an engine and too frightening for a human to decide on "against" his engine. After the text move the game safely reaches a harbor of peace. ] 31.Nd1 Bd2 32.Kf1 Re8 33.Ne3 Re4 34.Ke2 B:e3 35.Kd3 Rd4+ 36.K:e3 R:c4


Unlike in the endgame arising in the 30...Rc8! line, the b4 pawn is not protected... 37.Kd3 Rc3+ 38.Kd2 Rc4 39.g3 Kg7 40.Rb2 Kf6 41.Kd3 Rc3+ 42.Kd4 a3 43.R:b4 Rc2 44.Rb6 R:f2 45.R:d6+ Ke7 46.Ra6 R:a2 47.h3 Ra1 48.Kc5 Rc1+ ½–½




Equidistance - Ciron

CSS/Pal Freestyle Tourney Final (45+5) round 3

[comments by IM I. Radziewicz]

This is probably the most complicated sacrifice of that tournament.


33. B:h6! f5 White could have play: 33...e5!? 34.Ne5! [34.Qf4?! b:c3 35.b:c3 Qd6 36.Ne5 N:e5 37.d:e5 Qd8 38.Ne2 g:h6 39.Q:h6 Bf8 40.Qf4 Rb8 with better position for black] 34...N:e5 [34...Qd8? 35.N:d7 Q:d7 36.Bf4 +-] 35.d:e5 Bc5 [35...Q:e3!? 36.B:e3 b:c3 37.b:c3 R:c3 38.Ne2with slightly better endgame foe white] 36.Qf4 (36.Qg5!?­) 36...g:h6 37.Ne4 cool :-) [37.Q:h6?! Bf8 38.Qg5+ Kh8 39.Ne2 Qd8 40.Qg3 Bh6 41.Nd4 Qe7 with better position for black]


37...Rf8  Possible was also:

a)    37...d:e4!? 38.Rg3+ Kf7 (38...Kh8 39.Q:h6 B:f2+ 40.Kh1 B:g3 41.Qf6+ Kg8 42.Qg5 +=) 39.Q:h6 Re7 40.Rg7+ Ke8 41.R:e7+ B:e7 (41...K:e7 42.Q:h7+ Ke8 43.Qg8+ Kd7 44.Qf7+ Kc6 45.Q:e6+ Kc7 46.Q:f5÷) 42.Q:h7 


and now:

·        42…b:c3 43.Rd1! (43.b:c3? R:c3 44.Qg8+  44...Kd7 45.h6 e3 46.Rd1+ Kc7 47.Qe8 e:f2+ 48.Kh2 f1N+ 49.R:f1 Qb4 –+ ;

·        42...e3!? 43.Rd1 e:f2+ 44.Kf1 Qb5+ 45.K:f2 Q:e5 46.Qg8+ Bf8 47.Qg6+ Ke7 48.Qg5 +=;

·         42...Rd8 43.Qg6+ Kd7 44.h6 b:c3 45.b:c3 Kc8 46.h7

b)      37...Bf8 38.Nd6÷; 37...Re7!? 38.N:c5 38...Q:c5 39.Q:h6 f4 40.R:f4 Bf5 41.R:b4 (41.Re3 Rg7 42.R:f5 e:f5 43.Qe6+ Kh8 44.h6 Ra7 45.Qf6+ Kh7 46.Q:f5+ Kh8 47.e6 Qd6 48.Qf6+ Kh7 49.Rg3 Rg8 50.Qf5+ Kh8 51.R:g8+ K:g8 52.f4 Kh8 53.Qf6+ Kh7 54.f5)

c)       37...f:e4? 38.Rg3+ Kh8 39.Qf6#; ]


Back to the game : 38.N:c5 38...Q:c5 39.c:b4 Qe7


40.Q:h6?! [40.Ra1! Ra8 41.R:a8 R:a8 42.Q:h6 d4 (42...Kh8 43.b5 d4 44.Kf1 Rd8 45.Ke2 f4 46.R:f4 d3+ 47.Kd2+-) 43.Qf4 Rd8 44.Rd3 Kh8 45.R:d4 R:d4 46.Q:d4 +-] 40...f4! 41.R:f4 R:f4 42.Q:f4 Rc4 Black is slightly better. Only slightly because it is hard to win with so little pawn… 43.Qh6 R:b4 44.Ra1 Rb8 45.Ra3 46.Rg3+ Kh8


47.Rg4 [47.Rg6!? R:b2 48.Rf6 Rb1+ 49.Kh2 Rb8 50.Qf4 d3 51.Rf7 Rb4 52.Rf8+ Bg8 53.Qh6+ Qh7 54.Qf6+ Qg7 55.Rd8 Rb3 56.Q:e6] 47...d3 [47...Rd8!? 48.Rg6 d3 49.R:e6 Qg7 50.Qd2 Qg4 51.Rd6 Rg8 (51...R:d6 52.e:d6 Qd4 53.Qh6=) 52.g3 Q:h5 53.Qf4 Qf5 54.Q:f5 B:f5 55.b4 Rf8 56.g4=]


48.b4? [48.Rd4! Rd8! (48...R:b2 49.R:d3= Rb1+ 50.Kh2 Qh4+ 51.Rh3 Q:f2 52.Rf3 Qh4+ 53.Rh3 Qe7 54.Rf3 Rb8 55.Kh3 Re8 56.Qf6+ Q:f6 57.R:f6 Be4 58.g4 Bd5 59.g5= Kg7 60.h6+ Kh7 61.Kg4) 49.Rd6 Kg8 (49...R:d6 50.e:d6 Q:d6 51.Qf6+ Kg8 52.h6 Qd7 53.Qg5+ Kf8 54.Qf6+=) 50.R:e6 Qg7 51.Qd2 with slightly better position for black] 48...Rd8 –+ 49.Qd2 Qf7 50.h6 Rg8 51.Rg5 Equidistance offers a draw 51...Rg6 –+ 52.b5 Qd7 53.R:g6 B:g6 54.b6 Kh7 55.Kh2 Qd8 56.b7 Qb6 57.g4 Q:b7 58.Kg3 Qb5 59.f4 Be4 60.g5 Kg6 61.Qa2 Qb6 62.Qf2 Qb4 63.h7 K:h7 64.f5 B:f5 65.Qh2+ Kg8 66.Qh5 Qe1+ 67.Kf4 Qe4+ 68.Kg3 Q:e5+ Equidistance resigns 0–1




Ciron – Zor_Champ

CSS/Pal Freestyle Tourney Final (45+5) round 8

[comments by IM Iweta Radziewicz]

This was the last round of the tournament, if Zor_Champ Team would have been lost this game they would tied with Rajlich for first place.

 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.B:c6 d:c6 5.0–0 Bg4 6.h3 h5 7.d3 Qf6 8.Be3 B:f3 9.Q:f3 Q:f3 10.g:f3 Bd6 11.Nd2 Ne7 12.Nc4 Ng6 13.Rfd1 Endgame is slightly better for white. It is also not easy to be played by the machines - humans intuition may be much better than computer calculations in such a positions. 13...Ke7 14.c3 Ke6 15.Kf1 Nf4?! (giving up center).


16.d4 f6 [16...N:h3? 17.d:e5 B:e5 18.N:e5 K:e5 19.Rd7+-] 17.B:f4! e:f4 White is better. 18.Ke2 g5 19.b4 [19.Na5!? This move try to exploit  weak black pawn structure. Rybka engine doesn’t not like this move much cause it gives bad values to the knight situated on the edge of board. 19...Rab8 20.Rg1 Rhg8 21.Kd3 f5 22.Rae1 with clear advantage for white].


19...b6! to stop Na5 20.a4 h4?! I don’t understand this move - it makes black structure even less flexible - it will be harder for counterplay around g4 breakthrough now. It looks like black pawn structure become inflexible - not even one black pawn can move without weakening black position.


21.a5?! What’s a hurry? [21.Kd3!?± Rad8 22.Re1 Rhe8 23.e5 f:e5 24.N:e5 B:e5 25.R:e5+ Kf6 26.Re4! Re6 27.a5 Ra8 (27...b5? 28.R:e6+ K:e6 29.Re1+ Kf6 30.Re5+- zugzwang) 28.c4 ± ] 21...b5 White Knight looses its good spot on c4. 22.Nb2 Rhd8 Black has no counterplay and has to defend but it is very difficult to find a win for white.


23.Nd3 Be7 24.Kd2 Re8 25.Kc2 Rad8 26.Rg1 Rh8 27.Rae1 Rd7 28.Kb3 Rdd8 29.Rd1 Rc8 30.Rd2 Rcd8 31.Rc1 Kf7 32.Re1 Rh6 33.Rde2 Ke6 34.Rd1 Rhh8 35.Rc2 Kf7 36.Rdd2 Rhe8 37.Nc1 Rd7…  "walking on the place".  


Now some action...  38.c4!? (Other plan was to try via e5) 38...Rc8 39.c:b5 [ Possible was also: 39.Ne2!? b:c4+ 40.R:c4 Rb8 41.Kc3 with better position for white ]. 39...c:b5 40.Ne2 c6 41.Rc3 Rdc7 42.Rdc2 Ke8 43.Nc1 Rd7 44.d5 Rdc7 45.d:c6! Kf7 46.Nd3 Rd8 47.Rc1 Rd4 48.Re1


48…Rd8 [ 48...R:c6? 49.R:c6 R:d3+ 50.Rc3 Rd4 51.Kc2 +- For instance: B:b4 52.Rc7+ Kg6 53.Rd1 R:d1 54.K:d1 B:a5 55.Rc6 Kf7 56.R:a6 Bc3 57.Kc2 b4 58.Kb3 Kg6 59.Kc4 Kf7 60.Rb6 Ke7 61.Kd5 Kf7 62.Rb7+ Kg6 63.Kc4 Kh5 64.R:b4 B:b4 65.K:b4 Kg6 66.Kc5 Kf7 67.Kd6 f5 68.e:f5 Kf6 69.Kd7 K:f5 70.Ke7 +- ] 49.e5


49… Kg6?! [ 49...Rdc8! 50.e:f6 ( 50.Rec1 Kg6 51.Nc5 B:c5 52.R:c5 f:e5 = ) 50...B:f6 51.Ne5+ B:e5 52.R:e5 R:c6 53.R:c6 R:c6 54.R:g5 Rc4 55.Rg4 ( 55.Rd5 Ke6 56.Rd8 Ke5 = White king is not active - position is equal. ) 55...Rd4 56.Kc3 Rc4+ draw ] 50.e:f6 B:f6 51.Ne5+


51… Kh5! [51...B:e5 was dangerous after: 52.R:e5 Rd6 (52...Kf6 53.Rcc5 Rd3+ 54.Kc2 R:f3 55.Rf5+ Ke6 56.R:g5 R:f2+ 57.Kd3 Rb2 58.Rg6+ Kf7 59.Rh6 Kg7 60.Rd6 and black probably will not be able to stop white pawn. 60...Rb1 61.Ke4 f3 62.Rg5+ Kf7 63.Rf5+ Ke7 64.Rdf6+- with mate treats) 53.Rcc5 Rd:c6 54.R:g5+ Kh6 55.Rgd5 Kg6 56.Kc3 Kf6 57.Kd4 Ke7] 52.Rc5 Be7 53.Rc2 Rd6 54.Nd7 Rd3+


55.Kb2?!  [55.Rc3! the next moves are very forcing 55...R:c3+ 56.K:c3 R:c6+ 57.Kb3 Bf6 (57...Bd8 58.Re8 Bf6 59.Nc5 transposed - see main line) 58.Nc5 Bd4 59.Re6! R:e6 (59...Rc8 60.R:a6 B:f2 (60...B:c5? 61.b:c5 R:c5 62.Ra8 +- In the game white King was situated on a3. Now black has no time to create counterplay.) 61.Ne4 +-) 60.N:e6 B:f2


This endgame is very complicated and tactical with long variations – but  it looks like white is winning!

Lets see: 61.Nc7 g4 (61...Ba7? 62.Kc3+-) 62.f:g4+ Kg6 (62...Kg5?? 63.Ne6+ +-) 63.N:a6 f3 64.Kc2 Kg5 (64...Be1? 65.Kd3 Kg5 66.Nc5 B:b4 67.Ne4+ Kf4 68.a6 +-) 65.Nc7

a)    65...Ba7 66.Kd2! (66.Kd3? Kf4 with counterplay) 66...Kf4 67.Ke1Kg3 68.Ne6 Kg2 69.Nf4+ Kg3 70.g5 +-;

b)   65...Bg3 66.Nd5 f2 67.Ne3 Bb8 68.Nf1 Kf4 69.Kd3 Ba7 (69...Kf3 70.g5+-) 70.a6 Bb6 71.Ke2 Ba7 72.Nd2 +-;

c)    65…Kf4 66.Ne6+ Ke3 67.Ng5 +- and black bishop will not stop white pass pawns 67...Kf4 68.N:f3 with winning position for white]



(Position after 55.Kb2)

Back to the game: 55...B:b4 56.Re6 Ba3+! [56...Rd6?! 57.Nf6+ Kg6 58.Nd5+ R:e6 59.N:c7 Re1 60.N:b5 B:a5 61.c7 B:c7 62.Rc6+ Kf5 63.Nd4+ Ke5 64.Re6+ K:d4 65.R:e1+-] 57.Ka2 Rd:d7! to the rook endgame! The most drawish type of endgame. 58.c:d7 R:c2+ 59.K:a3 Rd2 60.R:a6 R:d7 =  (!)


61.Kb4 [61.Ra8 Rd4!= 62.a6 Ra4+ 63.Kb3 Kg6 64.a7 Kg7 65.Kb2 Kh7 66.Kc3 Kg7 67.Kb3 Kh7 68.Kc3 Kg7 69.Kd3 Kh7 70.Rb8 R:a7 71.R:b5 Kg6=; 61.Rb6?! Rd3+ 62.Kb4 R:f3 63.a6 R:f2 64.R:b5 Rb2+ 65.Kc5 R:b5+ 66.K:b5 f3 etc.] 61...Rd4+!

Hydra team had defend very well! Position despite high computer scores is drawn. [ Instead of 61..Rd4+! 61...Rd3? would be a losing mistake after: 62.Ra8 R:f3 63.a6 R:f2 64.a7 Ra2 65.Rh8+ Kg6 66.a8Q R:a8 67.R:a8 +- ]


62.K:b5 [ Another but not better try was: 62.Kc5 Rd3! 63.Ra8 (63.Rb6? R:f3 64.a6 R:h3 65.R:b5 Ra3 66.Kb6 h3 –+) 63...R:f3 64.Rh8+ to put black King further from the pawns (64.a6?! R:h3 65.Rh8+ Kg4 66.a7 Ra3 67.a8Q R:a8 68.R:a8 Kf3 69.Kd4 b4 –+) 64...Kg6= 65.a6 Ra3! (65...R:f2? 66.a7 Ra2 67.a8Q R:a8 68.R:a8; 65...R:h3 66.a7 Ra3 67.a8Q R:a8 68.R:a8 Kf5 69.Kd4+-) 66.K:b5 Ply 25 (!) - finally RYBKA 1.1 "agree" that white position is only slightly better. (66.Kb6? b4 67.a7 b3 68.Rd8 b2 69.Rd1 Rb3+ 70.Kc7 Rc3+ 71.Kb6 Rc1 and black is faster) 66...Ra2 = For instance: 67.Rg8+ Kh7 68.R:g5 R:f2 69.Kb6 Rb2+ draw ] 62...Rd3 63.Ra8 63...R:f3


64.Rh8+ [64.a6 R:h3 65.Rh8+ Kg4 66.a7 Ra3 67.a8Q R:a8 68.R:a8 Kf3] 64...Kg6 65.a6 Rb3+ 66.Kc6 Rc3+ 67.Kb7 Rb3+ 68.Ka8 Rybka 1.1 depth… 29  68.... Rh3 70.a7 =0.00 [68.Kc6 =] 68...R:h3 69.a7 g4 70.Rg8+ [70.Kb7 Rb3+ (70...Ra3? 71.R:h4 Rb3+ 72.Kc6 Ra3 73.R:g4+ Kh7 74.Kb7 Rb3+ 75.Ka8+-) 71.Kc6 Ra3 72.a8Q R:a8 73.R:a8 g3 74.f:g3 f:g3 75.Kd5 h3 76.Rg8+ Kh5 77.R:g3=] 70...Kf5


71.Kb7? Time trouble?! [ Still a draw after: 71.Rf8+! = Ke5 (71...Ke4 72.Re8+ Kf3 (72...Kd5 73.Rg8 =) 73.Kb7+-) 72.Re8+ Kf6 73.Rg8 =] 71...Ra3 –+  Black is winning 72.a8Q R:a8 73.K:a8 g3 Ciron resign  0–1



Vvarkey,Rybka 1.1 - Relic,Rybka 1.1

CSS/Pal Freestyle Tourney Final (45+5) round 1

Everybody had to wait for two comps to finish J, but nobody complained – this time the endgame happened to be very rare and quite sophisticated (it was not just a different color bishops with setup blockade J) :


48…e4! 49.R:e4 [49.B:e4 Qf1#] 49...N:e4 50.B:e4


Is black better in this endgame having Queen for 2 pieces and 2 pawns? Black is certainly the one who can “try” to win, but I think this position is a draw. Certainly this one is a draw: five stones tablebases J

who ever to move draw

Ok, a lot of moves passes and white somehow let black to create passed pawn, anyway it should be still a draw according to my “human evaluation”.


It looks like there is no way to push a pawn forward without loosing it…Both engines evaluate the position the same way - black is much better. If so, (assuming it is a draw) will they play the best moves to make it? Can engines play the best moves having the wrong evaluation of position?

                                                                   Guest answer (Vasik Rajlich):

Yes, and no. The important thing is how an engine evaluates the positions in the search tree relative to each other. If the factor being misevaluated persists throughout the search tree, the misevaluation is not harmful. More commonly, however, when an engine misevaluates the base position, relative misevaluations inside the tree will follow. For example, if black’s position is overestimated, then as white the engine may volunteer to go into a worse position of another type rather than keep the current imbalance.

The position here (from VVarkey-Relic) falls more in the first category – Rybka overvalues the queen, but does so consistently throughout the search tree, and there are few plausible ways to exchange the queen. So, in this position, the root misevaluation should not be very harmful. Still, as the game continuation proves, it may not be completely harmless, either.



How is black going to win if white waits - playing Kh2-g2-h3 when black does not attack f2 and moving bishop when Black does? 80.Nf5?! Looks like white is trying to exchange pawns. Qd5+ 81.f3 Qe5 85.Bc6 Qf4 86.Ng2 Qh6+ 87.Kg3 Qg5+ 88.Kh3 Qf5+ 89.Kg3 Qg6+ 90.Kh3 Qf6 91.f4

After about 40 moves using “zugzwang” or “luck” black managed to get into this position:


128.f5 White could try to play 128.Kf1 but it looks like it is the losing move: 128.. Kf3 129.Nc3+

a)    129… Ke3! 130.Nd1+ Kd2 131.Nf2 Q:f4 132.Kg1 Qg3+ 133.Kf1

b)    129...Kg3? 130.Ne2+ Kg4 131.b6=;

c)    129...K:f4? 130.Bg2 Qh8 131.Ne4 Qa1+ 132.Kf2 Qb2+ 133.Kg1 Here Rybka 1.1 will "never" take the “b” pawn because it will hit tablebases with draw evaluation.  133...Q:b5 =); ]

128...Qg3+ 129.Kd2 Qd3+ 130.Ke1 K:f5 Somebody from kibitzers posted that this position according to six stone tablebase is winning for black…


…perhaps Kibitzer was right, but the game finish after next 50 move as a draw! Engine could not find a forced win with so little time or Kibitzer was wrong and endgame is drawn anyway, or the position is winning but with more that 50 moves...131.Kf2 Ke5 132.Ne3 Kd4 133.Nd5 Qf5+ 134.Ke2 Qh3 135.Kf2 Qg4 136.Nb6 Qf4+ 137.Kg2 Qe5 138.Nd5 Ke4 139.Nf6+ Kd3 140.Ng4 Qf4 141.Kh3 Kc4 142.Kh4 Kb4 143.Bd7 Kc3 144.Kh3 Kb3 145.Kh4 Kb4 146.Be8 Kc5 147.Bc6 Kd4 148.Kh3 Qd6 149.Kh4 Qc5 150.Kg3 Qf8 151.Kg2 Qd6 152.Kf3 Qb8 153.Kg2 Qd8 154.Kg3 Qc7+ 155.Kf3 Qd6 156.Kg2 Qe6 157.Kg3 Qg6 158.Kf4 Qh5 159.Kf3 Qf5+ 160.Kg3 Qh7 161.Nf6 Qg7+ 162.Ng4 Qg8 163.Kf4 Qg6 164.Kg3 Qf7 165.Kh4 Qe7+ 166.Kg3 Qa3+ 167.Kf4 Qf8+ 168.Kg5 Qe7+ 169.Kf4 Qe2 170.Kf5 Qc2+ 171.Kg5 Qc5+ 172.Kf4 Qc4 173.Kg5 Qf1 174.Nf6 Qd3 175.Nd7 Qc3 176.Nf6 Qe3+ 177.Kg6 Qe7 178.Ne4 Qe6+ 179.Kg7 Qe5+ 180.Nf6 Qe7+ ½–½



Vvarkey,Rybka 1.1 - Klosterfrau

CSS/Pal Freestyle Tourney Final (45+5) round 4

[comments by IM I. Radziewicz]

1.e4 e5 2.Nf3 Nc6 3.Bb5 Nf6 4.d3 d6 5.0–0 Bd7 6.c3 g6 7.Nbd2 Bg7 8.Re1 0–0 9.Nf1 Nh5 It does not look that this variation promise white an advantage.


10.Ba4 Kh8 11.Bg5 [11.d4!? e:d4 12.N:d4 with more less equal position] 11...f6 12.Be3 f5 black is slightly better 13.e:f5 g:f5 14.Bg5 Qe8 15.Ng3 Qg6! Hoping for Bc6?


16.B:c6? Until depth 15 Rybka consider this move as the best alternative for white. Other way for white was to play:

16.Qd2!? but then black can play 16… f4 17.Ne4 h6 18.Be7 Rg8 with attack, or…

16.Bc1 Ply 16! White idea is to play d4 and fight for equality, but black can then play 16...f4! Closing Bishop c1. Now white would have 3 choices:

a)    17.N:h5 Q:h5 18.d4 Bg4 19.d5 Ne7 20.Bc2;

b)   17.Ne4 d5 18.Nc5 Bh3 19.Nh4 Qg5 20.g3 (20.N:b7 Nd8 21.N:d8 Ra:d8 with attack) 20...Rf6 with attack;

c)    17.Nh4 17...Qg4 18.N:h5 (18.Q:g4 B:g4 19.Ne4 Nf6 with better endgame) 18...Q:h4 19.N:g7 K:g7 =+

Back to the game: 16...B:c6 with better position for black 17.Be7


17…Nf4! White has very weak white squares 18.Nh4 Qf7 19.B:f8 R:f8 with much more than compensation for black! 20.Nf3 Rybka "thinks" that white remain balance... [20.Ng:f5? N:g2–+] 20...Bf6 21.b4 h5 Black develops an attack 22.h4 Qg6 23.a4 b6! to keep bishop on the long diagonal 24.b5 Bb7 25.a5 Engine is not able to “feel” the danger... yet.


25...N:g2! –+ 26.K:g2 f4 27.Re4 f:g3 28.f:g3 B:e4 29.d:e4 Q:e4 Black is a pawn up with better position and Vvarkey Rybka 1.1 had to give up after next 20 moves when reached score –10 for black.


30.a:b6 a:b6 31.Ra7 Rg8 32.Qd2 Rg6 33.Qa2 Rg7 34.Ra4 Qg6 35.Qf2 Kh7 36.Ng1 d5 37.Kh2 e4 38.Nh3 Qg4 39.Ra2 Be5 40.Ng5+ Kg6 41.Kg2 Bf6 42.Ra8 B:g5 43.h:g5 Qf5 44.Rf8 Q:f2+ 45.K:f2 Rf7+ 46.R:f7 K:f7 47.Ke3 Kg7 48.c4 d:c4 0–1



Rajlich -  Klosterfrau

CSS/Pal Freestyle Tourney Final (45+5) round 6


Whole Rajlich Team was so blind by Rybka suggestions that we did not even consider the coming hit…! Human got it right! Black played 16…N:e5! I had to admit that we were surprised by that and we soon starting to realize that maybe we don’t have advantage. The game continued: 17.N:e5 Qe1+ 18.Kc2 Rf6


19.Qg5 Interesting but very dangerous and forced alternative was to play into the line: 19.Nd3 R:f4 20.N:e1 Rf2+ 21.Kd1 e5 22.h3 d:c4 23.a3 Ba5 (23...Be7!?) 24.e4 Be6 25.Bg5 R:b2 26.Nf3 c3 27.Kc1 Black has 3 pawns and bishop pair for a knight…+ very active pieces. Rybka playing alone would have chosen this dangerous for white position.


The game continued this way: 19...R:f1 20.R:f1 Q:f1 21.Bd2 Qf2 22.Qg6+ Kd8 23.Rd1 B:d2 24.R:d2 Qf5+ 25.Q:f5 e:f5 26.c:d5 c:d5 27.Kc3


27…Ke7 28.h4 Be6 29.Rg2 Kf6 30.Kd4 Bf7 31.Nd7+  Ke7 32.R:g7 Rh8! with equal rook endgame coming up: 33.Ne5 Rh4+ 34.Kd3 Kf6 =





CSS/Pal Freestyle Tourney Final (45+5) round 2


We were annoyed by the fact that the position is very drawish and that we cannot beat something whose moves we can exactly predict… and then light comes to us J !  Why not to explore the fact that King Crusher is not playing as a centaur?

First advantage you have against unattended Rybka is you can play such as cool move as 45. .. Rd5!?! in this position! Of course white took it and Rybka scores jumped.  46.Bd5 N:d5


Position is probably still objectively drawn but … we knew Rybka “thinks” she is much better and she will not make a draw even if this will cost her a pawn after 49 moves. So we went for this funny complication knowing that there is no risk for us to lose… Rybka moved all possible pawns then 49 moves passes and she played something that we were expecting and hoping for - b4 giving up a pawn, which made position more complicated but still equal…. In the end we agreed for a draw anyway.


Rajlich - Ciron

CSS/Pal Freestyle Tourney Final (45+5) round 1


30… Rd8+?! Ciron offered a draw, and GM Krasenkow started to be very content because he considered that after 30...b6! 31.a5 b5 32.a6 Rb6 the position should be an “easy draw” (black rook stay active behind a passed pawn to create counterplay against white play f4-f5), but after Rd8?! It is suddenly much harder to draw. GM Krasenkow sensed we still have chances to win: 31.Ke3 Rd7 32.a5 Kd6 33.f4 Kc5 34.f5 b5 35.a:b6 a:b6 36.Kf4 Re7 (36…Rd2!? Give chances to draw) 37.Rc1+ Kd6 38.Rd1+ Kc6 39.e5 Rd7 40.Rc1+ Kd5 41.Rc8 b5 42.Rb8 b4 43.R:b4 Ra7 44.e6 f:e6 45.f:g6 Rg7 46.Kg3 R:g6 47.Kh4 e5 48.K:h5 Rg8 49.g6 e4 50.Kh6 Black resign.


Zor_champ  - Relic,Rybka 1.1

CSS/Pal Freestyle Tourney Final (45+5) round 3


20.b4! The only move - black was threatening Ra5 to win white Queen. 20...c:b4 21.Bb6 Qd7


22.Q:d7! [22.B:d8?! Q:b5 23.c:b5 R:d8 24.Bc4 Bc5+ 25.Kh1 Black has more than compensation.] 22...R:d7 Unclear position. Are whites strong center pawns and bishop pair enough compensation for a pawn? [ Interesting was 22...N:d7 23.d6! Bg5  with unclear (23...N:b6? 24.d:e7 Re8 25.c5 Nc8 26.Bb5 +-) ] 23.Bd3


23…Bd8 Black is trying to establish blockade in black squares by exchanging black squares bishops. Also interesting was: 23...Rdd8!? with the following possibilities:

a)    24.B:d8 Bc5+ 25.Kh1 R:d8 26.Bc2 Ra8 with compensation

b)    24.Bf5!? 24...g6 25.Bh3 Nd7!?


And now:

·        26.d6 N:b6 27.d:e7 Re8 28.c5 Nc4 29.Rd7 Na5 with better position for black

·        26.B:d8 26...Bc5+ 27.Kh1 R:d8 28.B:d7 R:d7 with compensation.  


(Position after 26.B:d8)

Back to the game: 24.Bf2! Ba5 25.g4 h6 26.h4 27.Bc2


27…b3!? Interesting sacrifice. 28.a:b3 a3 29.Ra1 Bc3 30.Ra2 White is better Kg7 31.Rd1 Bb4 32.Kg2 Rd6 33.Kg3 Rda6 34.Be1 Rb6 35.Kf2 Nd7 36.Ke2 B:e1 37.K:e1


37…e4!? 38.f:e4 Ne5 39.g5 (39.Ra1!? white is better) h:g5 40.h:g5 f6 41.Rda1 f:g5 Black has got counterplay 42.R:a3 Rh8 43.Kd2 Rh3 44.Ra7 Nf3+ 44. 45.Kc1 Kf6 46.c5 Rb5 47.R7a5 R:a5 48.R:a5 Ne5  (48..g4!?) 49.Kb2 g4 50.Ra1 g3 51.Rg1 Kg5 52.b4 Kf4 53.b5 Kf3 54.c6 Rh7 55.Ba4 Nc4+ 56.Kc3 Nb6 57.Bc2 Rh8 58.c7 Rh7 59.d6 Rd7 60.e5 Nd5+ 61.Kd4 N:c7 62.Be4+ Kf4 63.Rf1+ Kg5 64.b6 Nb5+ 65.Kd5 Nc3+ 66.Ke6 Rh7 67.d7 R:d7 68.K:d7 N:e4 ' 69.e6 Nc5+ 70.Kd6 Ne4+ 71.Kc7 Nf6 72.e7 Nd5+ 73.Kd6 g2 74.Rg1 Nf6 75.R:g2+ Kh6 76.Kc7 Kg7 77.Kd8 g5 78.R:g5+ Kf7 79.Rf5 Ke6 80.R:f6+ Ke5 81.Rg6 Ke4 82.e8Q+ Kd3 83.Rg3+ Kd4 84.Qa4+ Ke5 85.Rg5+ Kf6 86.Qg4 Kf7 87.Qf5#



Forgive me J I did not comment last game with more details – It would take me another day J and Vasik Rajlich is already very in hurry to publish Free Style report, because he had already announced to do this a week ago J I hope you enjoyed cool games from Free Style Internet Tournament.

- with chess regards Iweta Radziewicz