1. f4 Nf6 2. Nf3 c5 3. g3 d5 4. Bg2 Nc6 5. d3 Qc7 Whites plan in this opening is to play an eventual e4 opening up the d-file. The Queen on c2/c7 supports the rooks doubling on this file
6. c3 h6 7. Qc2 Supports rook doubling on the d-file and the e4 push
e5 Black gets in e5 before white can play e4
8. e4 White has to consider some possibilities here. If black got another turn he would not play exf4 because white can recapture Bxf4. He would rather play e4 himself and at a minimum white will have a backwards e pawn. If white plays fxe5 black does not need to recapture immediately ( e.g. Nd7 ) and white would end up with an isolated pawn if playing e4. White continues with the original plan
dxe4 exf4 was not played because of the bishop recapture
9. dxe4 The d-file is now open. Both players would need a minimum of 5 moves to double rooks on the d-file ignoring tactics ( shift two minor pieces from the back rank, long castle Rd2/7, Rd1/8 ) , and it is black to move so has the first shot at claiming it
Bd6 Black takes the first step towards controlling the d-file, and unfortunately for white he gains a tempo in the process by threatening to win a pawn
10. f5 Prevents the loss of a pawn and cramps blacks light bishop, if it were to move to d7 then it blocks the a square the rooks require to double
b5 gains some queenside space and allows the bishop to develop without blocking the d-file
11. h3 White wants to develop his bishop and plays h3 so that it can develop to e3 without having it chased away by Ng4. The bishop would not sit well on b2
Bb7 12. Be3 O-O Black decides he can castle short and still get the d-file. The short castle looks like it has better pawn cover for the king, but white has some fairly advanced pawns on that side.
13. Nbd2 Blocks a square required to double the rooks. If the knight went to Na3 it would have limited usefulness after a6.
Na5 I think that black was trying to line up the weak pawn on e4 here, but the move takes the knight out of play at the same time
14. O-O The light bishop would be hanging after a long castle. The short castle lets the king protect it. The light bishop is required to protect the e4 pawn that is coming under attack.
Bc6 Making space for the queen on b7
15. b3 removing the c4 square from the a5 knight
Qb7 16. Nh2 Discovered defence of e4
Rad8 17. Rad1 Rd7 18. h4 Rfd8 Black can now claim the d-file, but d2 and d3 are blocked until either the knight or the dark bishop can be removed
19. g4 In the mean time whites play lies on the kingside
Be7 20. g5 forces open the h-file
hxg5 21. hxg5 Nxe4 If white now plays Bxe4 Bxe4 Nxe4 Rxd1 Rxd1 Rxd1+ Qxd1 Qxe4 white would be a pawn down and about to lose another. Nxe4 leads to the same situation.
22. Ng4 Blacks knight is pinned to his light bishop. White 'threatens' e5 forking the light bishop and rook, and 'sacrifices' the g5 pawn
Nxg5 23. Bxc6 If white recaptures with the queen then the queen and rook will be forked after Nxe5
Nxc6 24. f6 ! This move will either open the g-file after gxf6, lose the bishop if nothing is done, lose the now-hanging knight if nothing is done, or if Bxf6 Rxf6 gxf6 Nxf6+ forking the king and rook and still attacking the hanging knight, and the g-file is opened.
gxf6 25. Rxf6 ! White is down three pawns, and offers a temporary rook sacrifice. If Bxf6 white could naievely win back the sacrificed rook by the Nf6+ fork
Nh3+ Black shifts the hanging knight with tempo. Additionally this blocks the h-file, blocks the g1 square from whites rook, and after Kh2 Bxf6 Nxf6+ Kg7 Nxd7 Qxd7 blacks queen on d7 protects the h3 knight, black is two pawns up and should be able to trade down to a win
26. Kh2 Bxf6 27. Nxf6+ Kg7 28. Qf5 Not Nxd7 bringing blacks queen back into play. White instead protects the f6 knight, threatens the h3 knight ( with king or queen takes ) , and prepares the queen to harass the king
Rd6 Saving the rook from the knight
29. Bh6+ ! White, although down an exchange and two pawns can offer a bishop sacrifice to secure a forced mate: Bh6+
.Kh8 Qh7#
.Kxh6 Qh7+ Kg5 ( f ) Ne4+ Kf4 ( f ) Qh4+
..Kf5 Qxh3+ Kf4 ( Kg6 Rg1#
) Rf1#
..Kf3 Qg3+ Ke2 ( f ) Re1#
..Ke3 Qe1+
...Kf3 Qg3+ Ke2 Re1#
...Kf4 Qg3+ Kf5 Qf5#

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