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Up Topic The Rybka Lounge / Chess / Rybka for Linux vs me
- - By zbu (*) Date 2019-02-05 11:53
i didn't played chess for a very long time.
i don't like chess because opponent always wins.
this time i lost again.
what i did wrong?

[Event "Computer chess game"]
[Site "Arena for Linux"]
[Date "2019.02.05"]
[Round "1/1"]
[White "zbu"]
[Black "Deep Rybka 4.1 SSE42 x64"]
[Result "0-1"]
[BlackElo "3200"]
[ECO "C20"]
[Opening "Open Game"]
[Time "16:24:07"]
[Variation "2.c4"]
[WhiteElo "1000"]
[TimeControl "900"]
[Termination "normal"]
[PlyCount "38"]
[WhiteType "human"]
[BlackType "program"]

1. c4 e5 2. e4 Bc5 3. Nf3 d6 4. Be2 Nc6 5. O-O f5 6. exf5 Bxf5 7. Nc3 Nf6
8. d3 O-O 9. h3 Qd7 10. Bg5 Bxh3 11. Bxf6 Rxf6 12. Ne4 Rg6 13. Nfg5 Bf5 14.
Bh5 Rh6 15. Bf7+ Kh8 16. Qf3 Nd4 17. Qd1 Bg4 18. Nxc5 Bxd1 19. Nxd7 Ne2#
Parent - - By user923005 (****) Date 2019-02-05 19:46
First of all, I think you played very well and also using an unusual opening is a good strategy against computers.

Your last chance to potentially save the draw was here (move 10):
r4rk1/pppq2pp/2np1n2/2b1pb2/2P5/2NP1N1P/PP2BPP1/R1BQ1RK1 w - - acd 36; acs 482; bm Be3; c3 "Bg5"; ce -69; move 10a; pm Be3;
pv Be3 Rae8 Ng5 Nd4 Rc1 Bb6 Nce4 Nxe2+ Qxe2 d5 Rcd1 h6 Nxf6+ Rxf6 Ne4 Rg6 Ng3 d4 Bd2 e4 Qh5 e3 Qxf5 Qxf5 Nxf5 e2 Rb1 exf1=Q+ Kxf1 a5 Ng3 a4 Ne4 Ra8 f4 Ba5 Bxa5 Rxa5 g4 Kf7 f5 Rc6 Kf2 Raa6 Kf3 a3;
Be3 and Kh2 are still below a pawn behind.

But after Bg5, you are behind 2 pawns and it goes downhill from there.
r4rk1/pppq2pp/2np1n2/2b1pbB1/2P5/2NP1N1P/PP2BPP1/R2Q1RK1 b - - acd 36; acs 117; bm Bxh3; c3 "Bxh3"; ce 193; move 10b; pm Bxh3;
pv Bxh3 Be3 Bxe3 fxe3 Qg4 Rf2 Qg3 Qd2 e4 Nh2 Rf7 Raf1 Raf8 d4 Qg6 Bd1 Nb4 Bc2 Nxc2 Qxc2 Be6 Ne2 Bd7 Qd2 b6 b3 h5 d5 h4 Nf4 Qg5 Ne6 Bxe6 dxe6 Re7 Rf4 Rfe8 Qf2 h3 Kh1 hxg2+ Qxg2 Qxg2+ Kxg2 Rxe6; white_wins 0; black_wins 0; draws 0;

At move 9, a3 or Be3 probably preserve the draw:
r2q1rk1/ppp3pp/2np1n2/2b1pb2/2P5/2NP1N2/PP2BPPP/R1BQ1RK1 w - - acd 36; acs 321; bm a3; c3 "h3"; cce 0; ce -18; move 09a;
pm Be3 {5} Ne4 {1}; pv a3 Bb6 Be3 Nd4 b4 Nxe2+ Nxe2 Bxe3 fxe3 Bg6 Ng3 Nd7 e4 h6 h3 a5 Qc2 Qe7 Kh2 b6 Rae1 Kh7 Qd2 Rf7 Qc2 Re8 Qd2 axb4 axb4 Kg8 Ra1 Nf8 d4 exd4 Nxd4 Nd7 Nc6 Qh4 Rxf7 Bxf7; white_wins 1; black_wins 1; draws 1;

If you want to play against computers and do well, you can lock up the pawns and play for a draw, but that is still very hard to achieve.
If you put Rybka on modern hardware, your opponent was probably about 100 Elo above Kasparov at his prime, so you should not feel too bad about losing.
As far as playing for a draw goes, take my advice with a grain of salt, because I never do that.
But I get my revenge by playing a weak engine like Golem.
Parent - By zbu (*) Date 2019-02-06 07:17
yes, it was fun game. i gave Rybka a check and traded queens.
Parent - - By Labyrinth (*****) Date 2019-02-06 05:26
Deep Rybka 4.1 is already arguably stronger than any human on the planet. So, it is recommended that one play a more reasonable opponent.

Anyways about the game:

1. c4 e5 2. e4?!

Unusual, and black scores well after this. The more common moves in order of commonality are: Nc3, g3, Nf3, e3, and d3. Playing 2. e4 leaves a hole on d4, and can be an obstacle to any operations on the light squares.


Other moves here include Nf6 and Nc6. Engines tend to like Bc5. Develops a kingside piece to enable castling, prevents d4 and takes aim at the f2 square. Black has a slight edge.

3. Nf3!

Perfectly reasonable, in practice white scores much better after Nc3 though. Not sure why.

3..d6 4. Be2!

Perfectly fine. Other moves here include h3, d3, and Nc3.

4..Nc6 5. 0-0! f5 6. exf5! Bxf5 7. Nc3! Nf6 8. d3! 0-0 9. h3?

Alternatives include Be3, a3 and Re1. The trouble with h3 is that it's not clear that black wants to move either minor piece again to go to g4, so this wastes a tempo. Doesn't seem like white would want to open up the kingside with g4 either, and it gives black a lever with which to attack white's kingside. Black has about a half-pawn advantage now.


Immediately targeting h3.

10. Bg5?

Alternatives are Ng5 and a3. White needs to be aware of the possibility of Bxh3 and what that might entail. Bg5 actually makes things worse. For one it doesn't pin the knight, and the knight may want to come to g4 in some lines. After 10..Bxh3 11. gxh3 Qxh3 12. a3?? would be a mate in 5 after Ng4. If white takes the knight with 12. Bxf6 then 12..Rxf6 is going to win the game, the king's safety is completely compromised. If 12. Nh2 to protect the g4 square, black has Qg3+ picking up the bishop on the next move, another reason why Bg5 is a problem.


mmmm hmmmm

11. Bxf6?!

Wisely avoiding the disastrous gxh3, but better was 11. Nd2! fighting for the g4 square and preventing immediate disaster. Black would still retain about a 1.5 pawn advantage there though. After Bxf6?! taking back with the rook gives black about a 2 pawn advantage, which should be enough to win for a decent human player.

11..Rxf6 12. Ne4!

I still prefer Ng5 gaining control over the critical light squares g4 and h5 and threatening to take the bishop on h2.


Difficult to say whether Rg6 or Rh6 was stronger here.

13. Nfg5!

Threatening to capture on h3 after Bh6, unpinning the g pawn and giving the rook very few squares to work with. Black is still ahead though.

13..Bf5 14. Bh5! Rh6 15. Bf7+! Kh8 16. Qf3??

Alternatives were Bd5 and Nxc5, Qf3 runs smack into Nd4.


This gives black the time needed to consolidate and coordinate. The advantage is now about 8 pawns.

17. Qd1?

More resilient was Qe3, but white is already beyond saving.


Very strong and wins the queen. The natural reply 18. f3?? results in Ne2# making use of a double check, if Qd2 then Ne2+ forces white to trade the queen for the knight.

18. Nxc5

Unfortunately doesn't work. White will not have time to take black's queen due to the threat of mate.

18..Bxd1 19. Nxd7?? Ne2#

For a ~3000 Elo engine, the opponent making a few dubious moves in the middle game is superfluous to get a win. The odd opening, a dubious Bg5, and an unnecessary weakening move h3 spelled doom, further inaccuracies simply hastened white's certain demise.
Parent - By zbu (*) Date 2019-02-06 07:16

>Unfortunately doesn't work. White will not have time to take black's queen due to the threat of mate.

i didn't see mate. Rybka used her queen for a distraction. the game suddenly ended.
Up Topic The Rybka Lounge / Chess / Rybka for Linux vs me

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