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Well folks, one cannot always be right! Yesterday, I wrote that there were two main options for Black on move 18 - and, naturally, the World played a third.

Actually, I confess that I had seen this move, 18...f5, but felt it was a bit too risky. I was reluctant to even point out the possibility when Black had a sound option in 18...e6. Perhaps I ought to stop being so crafty! I should repeat again that I don't see the Analysts' recommendations before writing my commentary (a good thing) so there is no question of me being partial.

There is no doubting that 18...f5 is the most ambitious continuation: Black safeguards the wonderful pawn mass, and even begins to roll it forward a little; but in so doing creates a few chinks in his defensive armour. The big question is: can Black survive the coming onslaught?

It comes as no surprise to me that Garry decided not to take the pawn on b6 - it was more trouble than it was worth. After 19 Qxb6 Nd4 he would have been put on the defensive immediately; Black would threaten ...Ra6 winning the Queen, and although she could be extricated, an unpleasant defensive task awaited. This is certainly not Garry's style: he would rather give up material and attack than make a greedy grab and defend. Besides, objectively, I think Black simply had the better game.

Instead, the World Champion has chosen to play 19 Bg5, bringing out the Bishop to the most aggressive square, pressurising the e7 pawn, and at the same time 'connecting' White's rooks. That means they now protect each other, making Rfe1 possible, attacking Black's Queen and increasing the pressure on the e-file. Moreover, while 18...f5 prevents the pawn from being taken, it does not stop the Queen from zipping down the diagonal to f7 hitting some potentially tender spots.

That's the bad news; now the good news. Black still has a superb pawn structure so, as before, if the Queens were to be exchanged then those centre pawns supported by the king would give Black the advantage. Therefore, Garry is going all out for the attack, though with Black's King protected by two pawns, and the Knight on c6 providing solid support, it is not easy to see how he is going to break through. Moreover, if the World Champion wishes to use all his forces in the assault, he will probably have to give up his pawns on the queenside - then he really will be burning his boats.

The game is becoming more and more tense. Once again, consider the analysts options carefully. That's all for now - I'm going to spend the afternoon analysing the position. For those of you interested in my conclusions, join me in the Zone theatre chat room at 2pm PST (10pm GMT).

Nd4 to Kasparov's Bg5.

I hope the move Nd4 will be accepted now. Garry probably will answer with 20.Qf7 Ne2+ 21.Kh1 Bb2. White has many moves now. (20.Qb6:Ra6!-+)

Nd4 to Kasparov's Bg5

My recommendation is 19...Nd4 again, and that is because we have to force White's Queen to move from such a strong position on b3. Meanwhile we have to develop our counterplay before the White Rooks can come into play. The only active move left for White would be 20. Qf7 threatening the Bishop on g7 and putting more pressure on the pawn on e7. Black can reply with 20...Ne2+ (check), opening the long diagonal for the black bishop on g7 and trying to use the Knight as a shield on the "e" file. White is forced to put his King in safety with 21. Kh1 and Black has enough time to capture one more pawn with 21...Bxb2. Here White can try 22.Rae1 - since 22. Rab1? fails to 22...Bd4 23. Qxh7 Rh8 24. Qxg6 Qg4! with the powerful blow 25...Nf4!. After 22. Rae1 Black can attack the rook with 22...Bc3! 23.f3 ( or 23.Bxe7) 23...Qe5 and now 24.Bxe7 looks as the most promising for White in this position: 24...Qxe7 25. Qxe7 Kxe7 26. Rxe2(getting his piece back) 26... Kd7. Here White can try either 27. Rc1 or 27. Rc2, in both cases with a comfortable play for Black:

27.Rc1 Bd4 28.Rc4 Bc5, or 27.Rc2 Bd4 28. Rc4 Bc5 29. Rd1 Kc6! 30. Rh4 d5(or 30...h5)31. Rxh7 Rxa4.

Qd4 to Kasparov's Bg5

I have to say that I don't like our position much. I have analysed four lines of moves: -19...Qg4 (a desperate attack) 20.Qxb6 Rc8 21.Be3! f4 22.f3 Qf5 23.Bf2 Black position is hopeless.

-19...Qb4 20.Qf7 Bxb2 21.Tab1 with a clear plus for White.

-19...Nd4 20.Qf7 Ne2+ 21.Kh1 Bxb2 22.Rab1 Bd4 23.f3 Qe5 24.Rfe1 Bc3 25.Bxe7 Qxe7 26.Qxe7 Kxe7 27.Rxe2+ Kd7 28.Rxb6 Rxa4 29.Rxb7+ and in this endgame White is clearly better off.

-19...Qd4 probably the best choice but now the World champion has two ways to continue his attack: -20.Rae1!? Be5 21.Qf7 Qxb2 22.h3 or 22.h4 with good prospects for White.

-20.Rfe1 Be5 21.Qf7 Qxb2 (if 21...Qg4 22.f4 is strong ; 21...h6 22.Be3 Qh4 23.h3 Qf6 24.Qb3 big advantage for white) 22.Rad1 Rxa4 23.Qxh7 and now:

-23...Rg4 24.Qxg6 Nd4 25.Rxd4 follow by Qxf5+ with active play for White

-23...Ra2 24.Rf1 and black's defense is difficult.

I hope the other Analysts will find a defense for Black.

Qb4 to Kasparov's Bg5

I recommend the World plays the move 19...Qb4 (Queen on e4 to b4)

SUMMARY Every moment in a chess game, there are problems to solve, and pit-falls to be wary of. When I was analyzing the move 18...f5, it was clear that Black needed an answer to White's most aggressive course 19.Bg5 (threatening 20.Rfe1). I made the initial suggestion of centralizing with 19...Qd4, and if 20.Rfe1, then 20...Be5 (shielding the e-file), after which GM Chess School explored the position further on their web-site, establishing in many lines that Black was holding the position or would achieve sufficient counterplay. However, on further review of a piece of that analysis, I have come to the conclusion that I must instead propose a different move, i.e., 19...Qb4.

ANALYSIS SECTION On further review of the analysis on the GM School site, and by "listening in" on teammates on the World Team Strategy Bulletin Board, I focussed my attention on one particular line that troubled me.

After 19...Qd4 20.Rfe1 Be5, there is 21.Rad1 (This is the problem with 19...Qd4 - White develops this ROOK with TEMPO) 21...Qxb2 22.Qf7 Rxa4 23.Qxh7, after which there are two important lines:

A) 23...Rg4 24.Qxg6 Nd4,

Here GM School gave only 25.Rxe5 Nf3+ 26.Kh1 Nxe5 27.Qxf5+ e6 28.Qf8 Rd4, "and Black has an extra pawn and chances to win." (Note that 24...Bxh2+? loses to 25.Kxh2 Qxf2 26.Rxe7+!)

Here they (as did I) apparently overlooked 25.Rxd4, and now after 25...Rxd4 (25...Qxd4 loses to 26.Qxf5+ e6 27.Qf7+ Kc6 28.Qe8+) 26.Qxf5+ Kc7, White has 27.Qh7, with a clear advantage.

In situations like this, you simply look to strengthen your play and your resolve, and I turned my attention to an alternative to 23...Rg4, i.e., 23...Ra2. The critical line after 23...Ra2 is 24.Rf1! and now there is the idea 24...Bd4!? I saw on the Bulletin Board ("WDThompsonJr").

After 23...Ra2 24.Rf1 Bd4, the critical lines are:

A) 25.Rde1? loses to 25...Bxf2+.

B) 25.Qxg6? allows 25...Bxf2+ 26.Kh1 Qe5, and Black is better.

C) 25.Bh4 Qe2 26.Qxg6 Qg4 27.Qf7 (27.Qxg4 fxg4, is fine for Black) 27...Re2 28.Bg3 Qe4, and I think Black is OK.

D) 25.Rd2! when after 25...Qb3 however, I did not come to a conclusion as to whether Black was OK after 26.Rxa2 Qxa2 27.Qxg6 Qc2 28.Be3.

While lurking and responding "anonymously" on the Bulletin Board, my attention was turned to the line 19...Qb4!? 20.Qf7 Be5 (20...Qxb2 seems too dangerous to me, and has the potential misfortune to possibly transpose into the 19...Qd4 line, after 21.Rfe1 Be5 22.Qf7 Rxa4).

This new line was being discussed by Jason Van Eaton ("Curious") and Brian McCarthy.

The critical lines are: 20.Qf7 Be5, and now:

A) 21.Rfe1? h6! is good for Black, as the Black queen on b4 is put to good use controlling the d2-square.

B) 21.Rae1 h6!? and now:

B1) 22.Bc1 Qh4 23.h3 (if 23.g3 or 23.f4, Black plays 23...Qf6) 23...Qf6, or; B2) 22.Be3 f4 23.Bc1 g5, with a complicated position. C) 21.Rfd1 Qg4, seems fine for Black, hitting the Bishop on g5, and threatening Ra8xa4 in some instances.

D) 21.h3 (with this move White deals with the little problem on h2), and now 21...Rxa4 22.Rxa4 Qxa4 23.Qxh7 Bxb2 24.Qxg6 Qe4, is unclear. Finally,

E) 21.f4 Bxb2 22.Rae1 Re8 23.Qxh7 Qd4+ 24.Kh1 Qg7, with an unclear position.

So then! 19...Qb4 is my recommendation.

I will be playing at the US Junior Championship for the next 12 days, and I am fortunate to have my trainer GM Giorgi Kacheishvili assisting me at the tournament, and helping me in my analysis of this game. Because of my change in time zone and my needs to prepare during the tournament, you will see me at later times on the Bulletin Board, and as ever, I look forward to your input, encouragement, and camaraderie.