Sicilian Dragon, why 6.Bg7?

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ColourblindCarrot

I'm doing some work to improve my opening knowledge and have been looking at some variations of the sicilian. In particular I like Dereque Kelleys videos on chessopenings.com because he goes into a good amount of detail about the basic ideas behind the early moves, which more advanced videos often brush over or leave out entirely.

In the video on the sicilian dragon Dereque explains why 6.Ng4 would be a grave mistakes, and then says that 6.Bg7 allows black to play 7.Ng4 on the next move if white doesn't defend against it. I have tried to work out why this is the case but I don't see any reason why white can't continue with 8.Bb4+ winning material? I have tried to find an explanation for this but I can't find one anywhere. Can anyone help, or atleast point me in the direction of a resource which will have the information I need. Thanks for reading.

baddogno

You should probably take a look at IM Keaton Keiwra's 9 part series on the dragon then.  Here's a link to the first video:

http://www.chess.com/video/player/the-fighting-dragon---part-1-the-yugoslav-attack-with-9bc4

Maybe if you posted a diagram, someone would chime in with the answer. It's not that hard.  Just click on the little chessboard and follow the directions.

Spectator94

Because before Black has played Bg7 he has to block the check, which is the cause of losing the piece. With Bg7 played Black can play Kf8 after which Ng4 is a good piece and the bishop on b5 will provide tempi for Black for example by some Queen move or simply a6-b5

Nerwal

6. Be3 Ng4? 7. Bb5+ Bd7 8. Qxg4 +-

6. Be3 Bg7 7. Bc4 Ng4 8. Bb5+ Kf8! = (Ljubojevic - Sosonko, chess olympiad 1978)

ColourblindCarrot

Thank you all for your help, it is very much appreciated. I understand the difference now. Surely the blocked in Rook now creates a bit of a headache for black though? I would imagine it would be sometime before black can manage to move the dark squared bishop and get his king nicely to safety. Is one tempi enough compensation for the blocked in rook? Doesn't seem to be.

Baddogno, I will certainly give that series I watch, thank you for the recommendation. I will have a go at posting a board now. I just had a quick look and it seems simple enough. I always assumed you had to be some programming wiz to make the boards so I've never tried before.

Thanks for clearing that up for me Gilasaurus.

Nerwal, I will try to find that game, could be useful to me. Thank you. 

ilikecapablanca

The way I've had it explained, it typically creates pressure along the h8-a1 diagonal.

ColourblindCarrot
I've had a go at making a demo board to explain the problem I was trying to work out. Thanks again to those who helped to resolve my problem.
 
 
X_PLAYER_J_X

@ColourblindCarrot

No No No No in your above diagram you have 6...Bg7 with the following text " Discouraging 7.Bb5+"

This is not true.

Black is not playing Bg7 to discourage a bishop trade.

Black would love to trade off whites light square bishop because whites light square bishop is an annoying piece for black.

The reason 6...Bg7 is played is to develop a piece and to make way for castling. It also vacates the f8 square in some variation's. Which allows for Ng4 moves to be on the cards.

ColourblindCarrot

Would anyone happen to know how I make the alternative continuations appear in red to signal a losing line?

X_PLAYER_J_X
ColourblindCarrot wrote:

Would anyone happen to know how I make the alternative continuations appear in red to signal a losing line?

From my understanding you can not make it appear red by choice. Usually a continuation will appear red if you have gone over 3 different continuations or so. Than they will color each variation different so people can see them better.

However, We know when the continuation is losing line because you can add blunder marks(Question marks) in the notation. Which will show it is a losing line.

For example:

In your diagram you have the following moves.

6... Ng4??7. Bb5+ Bd7 8. Qxg4

We know its losing because of the double question marks.

However, the above continuation is not the only contination.

6...Ng4?? 7.Bb5+ Nd7 8. Qxg4

or

6...Ng4?? 7.Bb5+ Nc6 8. Nxc6 bxc6 9.Bxc6+ Bd7 10.Bxa8

 

Those are the other losing continuations.

ColourblindCarrot

Thanks X_Player, I see your point. I think it would have been more accurate of me to say that it opened the way for 7...Ng4 attacking the bishop because now blacks light squared bishop cannot be pinned or trapped by Bb5+. Hopefully that's correct.

X_PLAYER_J_X
ColourblindCarrot wrote:

Thanks X_Player, I see your point. I think it would have been more accurate of me to say that it opened the way for 7...Ng4 attacking the bishop because now blacks light squared bishop cannot be pinned or trapped by Bb5+. Hopefully that's correct.

Your going to hate me but the idea with 7...Ng4 can be wrong as well.

Don't blame me lol please lol.

I mean you are on the right path but the Sicilian Dragon is a complex line which has very subtle differences in some variations. The other problem is it is very razor sharp so 1 slip up is all white needs or black needs to win. Which is why these small nuances matter.

Which is why the idea you have can only apply to some variations and not to all variations.

The idea with Ng4 is to get the dark bishop. However, black has to be careful when he trys to get that bishop. If black goes to soon he ends up dead. If black goes to late he can miss his chance to have a dragon bishop which will be unopposed.

An unopposed bishop is one of the deadliest bishops in all of chess.

Which if black gets that dark bishop white will have no real way of trading off blacks dark bishop. Which means black will run terror and dragon fire down the center of the board unchallenged through out the whole game. Which is why they strive for these small details.

7...Ng4 would only work if white does not defend the g4 square.

Usually after 6...Bg7  white will play 7.f3  which defends the g4 square making Ng4 impossible.

In some white variations they will play 7.Be2 which is a direct tranposition into the Classical variation of the Sicilian Dragon.

The mainline move order of the Classical variation is to have 6.Be2 and not 6.Be3

However, Some people will try to do a trick move order to confuse you. Which is done to make sure you know what your doing as black.

The position bascially is no longer a Yugoslav attack any more its a completely different variation. However, some people play it that way as a way of tricking sicilian dragon players with move order tricks.

If they play 7.Be2 you can't play 7...Ng4  because that would lose a piece instantly since white has 2 pieces guarding g4 and black only has 1 piece guarding g4. White would follow up with 8.Bxg4 and win a piece.

7...Ng4 works if your opponent does not find a defense to the g4 square. Which means if they played something like 7.Qd2 than you have 7...Ng4.

In short what you want to know is if white does not defend the g4 square Ng4 is usually a go to move. If white defends g4 square which their are several moves he can play to defend it than Ng4 is a no go.

7.Be2,  7.f3, or 7.h3 These are a couple of moves as you can see which defend g4.

X_PLAYER_J_X

The below diagram is usually how the Yugoslav Attack line plays out.

Here is the Classical Variation line it plays out little difference. However, White has some different variations they can use.

As you can see if they go with the Classical move order they could try for 7.Be3 line.

Which if they want to be tricky they can start it off with the Yugoslav Attack move order.

 

Players like to be tricky in chess to confuse you lol.

its a tricky move order that sets a trap. If you forget your objective you can fall prey to it.

The objective is the g4 square. The idea you have is to use the g4 square for your knight to attack the dark bishop.

An here is the line my friend fell into. He fell into the trap with this weird move order trick.

My friend said " Wait a min I think white messed up. They are suppose to play 7.f3 in the Yugoslav attack and he didn't".

Than he thought about it and said I think I can play Ng4 here because if white plays Bb5+ I can just move my king to f8 and not lose a piece.

That is what my friend was thinking.

However, He missed the simpliest idea. The knight is not defended accurately.

My friend was thinking of all complex Kf8 moves and all that stuff and the simple move is the move that killed him.

Simply because he forgot the objective.

You can't worry about the bishop if you can't get to g4.

Robert_New_Alekhine

The reason that after Bg7 white cannot play Bb5 is that there is no reason! However, white's only USEFUL move in the position is Qd2, whereas after Ng4! Bb5+ Bd7 and black is much better.