6...Wow! Going into this wild variation at this critical stage of the tournament is really courageous, Arun!

16 I've also seen Vivek Rao play 16 Rb1! here. The idea is sac the knight, and then follow with Rxb7!

20 Wooooo-ooo!!
Everybody Daa-aaance!
Woo-hoo-hoo
Clap your hands
CLAP your hands!!

If K moves now, -Qxc4!. Btw, this entire wild variation is given in Kasparov's book 'The Test of Time'!

21 Wooooooo!!! Now if 21...Rxd4, White plays 22 cxb7+ Kc7 23 Ra8! and then just queens! It's outrageous.

30...On 30...Rd2 31 Qe5+ K moves 32 Qf4! gives defensive capabilities.

31...c2 is answered by 32 Rc1 (Not 32 Ra7+? Kd6 33 Qd3+ Kc6 34 Qe4+ Rd5)

32 !! - What a concept from Hebden here! (But see ...33!, and ...36!)

33...c2! looks tough. ( 34 Rc1 Qb2!)

35...Wow. That's amazing. After 35...c1(Q), 36 Rxc1 Qxc1 37 g6! Rd8 38 Qg3+ and g7, White does indeed get big counterplay - at least drawing!

36...? Time pressure? 36...e5! wins!

37...And 37...Rd2 ?

Then 38 g6! Qxc1 ( 38...fg 39 f7 Rd8 40 Qf3+ Ka7 41 Rxc2 looks all right) 39 g7 Rxf2+ 40 Qxf2 Qh6 41 Qxc2! wins! What a variation! Black can't prevent queening!

39 This is so outrageous! Like something a computer would come up with.

42...! Strengthening the ...e5 idea - so forcing White's next, defusing g6. This forces a draw.

47 The dangerous looking 47 g6 only draws, tho Black must find the key idea: 47...fg 48 Kg5 Kd7 49 Kxg6 e5!! 50 fe ( 50 f5 e4 leads to queen endings that look drawn) Ke6 51 Kg7 (Not 51 f7?? Rf8!, and Black wins! [Not 51...Ke7?? 52 Kg7! Rf8/c8 53 e6! when White wins!]) Rd7+ 52 Kh6 Rd8 53 Kg7 Rd7+ draws.

48...forced!

On 49 g6, Black brings off an unlikely drawing idea: 49...fg 50 Kg7 Ke8!! 51 Kxh8 (or 51 f7+ Ke7 - same idea) Kf7!, drawing. The text is similar to this.

Just a couple of the suprising things that happen:

Black is prepared to walk directly into a queen and rook battery which...ends up just being a blind alley for White.

At one point Black has two moves on the d-file with his K. One draws, and the other wins.

White plays an unlikely sequence where he is down a rook, but drawing unless Black can play perfectly to demonstrate the win.

Move 36...e5

37 Qc4+ Kb7! (U.)

(Not 37...Rc5 38 Qxf7+ Kc6 [ 38...Kb8 39 Qe8+ Rc8 40 Qxe5+;=] 39 Qe8+ Kb7 40 Qa8+ Kc7 41 Ra7+ Kd6 42 f7 =)

38 Rc1! (U.)

( 38 Qe4 Kc6 39 Qc4+ Rc5 wins [ 40 Qe4+ Kd6; 40 Qxf7 Qg4+] ; 38 Qa6+ Kc6! ( 38...Kc7 39 Qc4+) 39 Qc8+ Kd6 40 Qd8+ Ke6 41 Qc8+ Rd7!(U.) 42 Qc6+ Kf5 43 Rc1 Qg4+ [ or 43...Qxc1] wins.)

38... Rd4! (box)

Now if 39 Qxc2+ Rg4+!(U.)

39 Qxf7+!

Which turned out to be much tougher than I thought.

39... Ka6

40 Qe6!!

I was ready to give up on 36...e5 here. I even wrote 'and Black can't win.' Then....'L.N.-No!'

40... Qxc1
41 Qc8+ Kb5
42 Qe8+ Kc5
43 f7

This is the move that made me want to just give up looking for the win.

Then I decided to see whether it might be useful to check WK to h3 first, rather than play 43...Rf4 immediately. Indeed, this is forced, and the only way to win.

43... Rg4+!
44 Kh3 Rf4
45 f8(Q)+ Rxf8
46 Qxf8+ Kd5!

(Not 46...Kd4? 47 Qxb4+ Kd3 48 Qb5+!, and White draws [ must also get the e-pawn to do that, hence not 48 Qc4+?)

47 Qf7+ ( 47 Qd8+ Ke4 48 Qa8+ Kd4 will escape)

47... Ke4!

(47...Kd4?? 48 Qc4 mate!)

48 Qc4+ Kf3

Here 49 Qd3+ Kxf2 is similar to 49 Qg4+ Kxf2. 50 Qf5+ follows both, but 50...Ke3 escapes to the queenside and wins, because Black has retained his b-pawn that he can shelter behind. Also after 49 Qd3+ Kf4 can be played, also ending the checks after 50 Qc4+ e4 51 Qf7+ Ke5 and here Black crawls around behind his e-pawn to also run to the queenside pocket and win.

So that's it!