(2) Jensen,Claus (2315) - Norchenko,Konstantin Grigorie (2325) [C00]
WS/MN/094 ICCF, 18.02.2013

1.e4 c5 2.Sf3 e6
He may have thought we were heading for a Tajmanov Sicilian, but that's not what I had in mind

3.d3 Sc6 4.g3 d5 5.De2
[5.Sbd2 is probably the more normal move]

[another development plan is to fianchetto the bishop 5...Sge7 6.Lg2 g6 7.0-0 Lg7 ]

6.Lg2 Sf6 7.0-0 0-0 8.e5
This is a key move in the King's Indian attack! - it could in fact have been on the previous move I guess. It's so important because otherwise black could play e5 at the right time! The move also removes a couple of defending from the kingside: The bishop on c8 and the knight on f6

This is an important position in the King's Indian Attack. White's plan is to start a piece attack on the black king, possibly following up with a pawn storm. Black, on the other hand, should do one of two things: 1) Quick advance of his queenside pawns to gain space and initiative there, or 2) Play f6 as quickly as possible to remove the white spearhead pawn on e5

prophylaxis against black's b5! [if instead 9.Te1 black can quickly expand on the queenside 9...b5 10.h4 b4 11.Sbd2 a5 ]

[in view of white's prohylactic move against b5, black should probably go for plan B - removing the e5 pawn 9...f6 10.exf6 Sxf6 ]

[I did consider 10.Sc3 to keep control of the b5 square, but black has 10...Sd4 11.Sxd4 cxd4 the knight on f3 was an important attacker for white and should not have been traded off for a black kingside knight!]

Clearly in white's interest! The e4 square is now a very nice square for a white knight [Surely the most principled continuation for black is 10...b5! ]

I allow myself another move directed at b5. The position is quite "slow", so why not take as much counterplay away as possible. Btw, the computer has no idea what is going on in a position like this one. If my memory serves me well, this was evaluated as slightly better for black! [the alternative 11.Sbd2 b5 12.Se4 bxc4 13.dxc4 gives black a little more play on the queenside]

strategically bad, if you ask me! Black has to play for either the b5 or f6 pawn break! [11...Tb8 12.Sbd2 b5 13.axb5 axb5 14.cxb5 Txb5 15.Sc4 ; 11...f6 12.exf6 Sxf6 13.Sbd2 ]

12.Sbd2 Tb8 13.h4
adding support for a piece to g5 and also giving space for a knight manoeuvre to h2-g4

a strategical victory for white! [the obvious alternative was 13...b5 14.axb5 axb5 15.cxb5 Txb5 16.Sc4 black can "liberate" some queenside pieces, but can he withstand the upcoming white attack?]

14.Se4 Lb7 15.Lf4
with the black queen on c7 this move rules out a future f6 from black

15...Sb4 16.Tad1
This is pretty much a dream position for the King's Indian Attack player! Black has been deprived his usual queenside counterplay and f6 is also not possible at the moment. And all white pieces are ready to jump at the black king!

What else can he play? Should I defend the a4 pawn?

the position is offering white some tactical possibilities which is why it's not neccessary to care about the pawn for now

black wisely removes the queen [if black takes the pawn he is in big trouble: 17...Lxa4?? 18.Sf6+! taking advantage of the fact that the f4 bishop is on same diagonal as the black queen 18...Lxf6 19.exf6 Lxd1 20.Dxd1 e5 21.fxg7 exf4 22.Dh5 ]

[the tactic on f6 doesn't work 18.Sf6+ gxf6 19.Sxh7 Te8 only leads to a draw]

in view of the upcoming Qh5, h6 has to come sooner or later

19.Sf3 b5 20.axb5 axb5
now that the knight has been driven from g5 it's time to occupy g4 instead.

21.Sh2 bxc4 22.bxc4 De8 23.Sg4
black is in trouble! All sorts of threats on f6 and h6

a really ugly move, but the alternatives were no better [one example 23...Ta8 24.Sef6+ Sxf6 25.exf6 gxf6 26.Lxc6 Sxc6 27.Lxh6 ]

[There may still be some tactic on f6 24.Sgf6+ gxf6 25.Dxh5 Sxe5 but probably not leading to more than a draw according to the computer]

24...Ta8 25.Ta1
there is still time to take ALL counterplay from black [25.Dxh5? f5 forcing a queen exchange]

25...Tb8 26.Ta7
White has a big advantage. Dominating both sides of the board. Black has no good moves

26...Ta8 27.Tea1 Txa7 28.Txa7 g6
After the pieces has provoked weaknesses in the black king position it's time push the pawns

29.g4 Db8
[29...Lxh4 30.gxh5 Le7 31.Sg4+- ]

rook had to move anyway, so why not remove a defender of the f6 square?

30...Lxd7 31.gxh5 Lc6 32.Sg4 Lxe4 33.Lxe4 Dd8 34.Lh6 Sa6
[34...Lxh4 35.Df3 f5 36.exf6 Txf6 37.Dg2+- ]

35.hxg6 fxg6 36.Sf6+ Lxf6 37.Dg4
I believe it was an interesting display of how dangerous the King's Indian Attack can be if black doesn't seek counterplay in time 1-0