1. e4 c5 2. f4 Sicilian Grand Prix Attack opening. When I first saw f4 I thought good my opponent is weakening his kingside, but it is actually a rather solid move. White will have castled before black can use the f-file weakness so it will be come a strength. White will also be able to develop his kings knight behind his pawns so that they remain mobile
Nc6 3. Nf3 e6 Preparing to play d5
4. Bc4 d5 d5 now gains a tempo as the bishop will be under attack even if the pawns are swapped. 4Nc3 may have been better
5. exd5 exd5 6. Bb5 Pinning the knight. White would have had an extra tempo if this was played as the fourth move instead of Bc4
Nf6 If the bishop takes the pinned knight black will be equal in development and have a strong pawn centre
7. O-O White gets to safety, but also with the rook baking the f pawn he is threatening to push it ( eventually ) ideally to f6. White also has the Re1 threat until black castles
Be7 Prepares castling. Note that if Re1 is played then any blocking move by black will pin the blocking piece. Be6 would be a bad block because f5 wins the bishop for a pawn. Ne4 has the same problem, and Ne7 is illegal due to the pin, so the text move is the only one that properly blocks the e-file
8. Bxc6+ There were probably better development moves to do here. If white really wants to swap it can be delayed util the move that black castles. Doing it now slows development and reduces whites options ( that is, white can swap the bishop or can redeploy it, but blacks knight has no options because it is pinned. Taking both pieces off the board means that both pieces have no options... so white has reduced options
bxc6 9. Ne5 If this was played at move 8 it would have had more effect since black would have had to have played Bd7 to avoid losing the exchange, which would have allowed white to trade knight for bishop
c4 There are a number of options to defend the pawn on c6. Bd7, Bb7, Qd6, Qc7, Qb6 and the text move. The listed moves are obviously moving an extra piece to defend the pawn, but why would one want their queen on pawn guarding duty? The two spots for the bishop aren't great. Black has the two bishop advantage so wouldn't want Bd7 where one bishop is under fire. Bb7 makes the bishop 'bad', it is blocked in on one diagonal by its pawn and is blocking the half open b-file that the rook would like to use. So how does c4 protect the pawn? It opens up the diagonal to whites king, so now Nxc6 loses to Qb6+ forking the king and knight. It also opens the dark squared bishops diagonal for moves such as Bc5+
10. d4 Blocks the diagonal, putting pressure again on c6
cxd3 re-opening the diagonal
11. Nxd3 cxd3 and the pawn could be immobilised with Ba6 pinning the pawn to the rook
Bg4 This move develops the bishop, but also notice how it restricts the white queens options. She only has two safe squares available
12. Qe1 Qd2 would have put the queen in an uncomfortable position. After Ne4 the queen would have to move again and can't move to anywhere except e1 ( The text move but a tempo down ) or f2 or e3 which both put the queeen and king in line on the dark diagonal. If the white knight was harrassed this could be dangerous. The text move also pins blacks bishop to the king
O-O King safety is the long term benefit, but it frees up the useful dark square bishop and threatens Re8 capturing the open file
13. Ne5 Blocks the e-file and threatens the bishop. While the bishop is threatened blacks knight on f6 must remain to support it
Bf5 The bishop pair is too nice to lose. Attacks a hanging pawn
14. c3 As mentioned above Nxc6 loses to Qb6+ forking king and knight
Re8 Lining up the rook with the queen and threatening a discovered pin on the knight
15. Nd2 Ng4 Ne4 was probably better as the knight would have been hard to dislodge from there. I had thought that the threat on the queen and control of the open file would have more power
16. Ndf3 The knight is now protected by a knight
Nxe5 Mistake. f6! is the move here. If the knight doesn't move it is lost for a pawn. If it does move then Bc5+ wins the queen. e.g. f6 Nd3 Bc5+ Nxc5 Rxe1 Rxe1 where black has a slight advantage of queen for rook and bishop
17. fxe5 If knight takes then the knight would be lost ( e.g. Nxe5 Bc5+ Be3 Bxe3+ Qxe3 f6 ) . This move puts the pawn in a powerful position
Bd6 Discovers a pin on the pawn and it is now attacked and defended twice. f6 would attack it a third time
18. Qg3 Leaves the pawn partially pinned on the diagonal instead of the file. The pawn is still twice defended, but now the pin is only partial since the pawn attacks the bishop down the line of the pin
Bc7 Returns the partial pin to a full pin ( the bishop is no longer under attack )
19. Bf4 The pawn is now defended thrice, and the pin is also released. Threatens e6
Rb8 Gets the final rook into a better position on the half open file, and attacks a hanging pawn. The big downside is that the rook is in the line of the enemy bishop
20. b4 a5 An offer of a pawn. Taking this pawn would reduce whites queenside pawns to three isolated pawns which would easily fall. Threatens to win a pawn axb4 cxb4 Rxb4
21. a3 protects the pawn
Re6 Lifts the rook to a place where it can harass the queen, pin pawns to the enemy king, and protects blacks backwards pawn on c6
22. Nd4 Threatens the pawn, rook and bishop
Bb6 Since so many pieces are forked, the forking piece is pinned. The rook is protecting the pawn but cant also protect the bishop
23. bxa5 The bishop can't take the pawn because it is holding the pin on the other diagonal 23... Bxd4+ 24. cxd4 Now black has a protected candidate pawn on e5 so whites centre pawns are stronger than blacks who has a backwards pawn on c6
Qxa5 Picks up a straggler. Black will now try to attack the a and d pawns while trying to protect the c-pawn.
25. Rf2 This is a good time to stop and look at the board colours. This move has got blacks last piece off a light square ( except one pawn ) . White has only two pieces on dark squares. The bishops of opposite colours are having their effect. Also note how whites bishop is bad ( stuck behind his pawns ) , whereas blacks bishop is good ( in front of his pawns )
Rg6 Threatens the queen, and when she moves the pawn will be pinned to the king
26. Qf3 Be4 Threatens the queen again and lines up the rook and bishop on the g2 pawn. Also the bishop can never be dislodged from this square as there are no pawns or minor pieces that can threaten it
27. Qe3 A tempo has been lost now ( this could have been done on move 26 ) . Also it locks one diagonal off from whites bishop
Qa4 Threatening Rb3 attacking the queen and winning the a-pawn
28. e6 Discovering an attack on the rook
Re8 Mistake. Rb3 was better here
29. exf7+ Kxf7 It now looks like there is a nasty discovered check available on blacks king, however black has no pieces on dark squares for the bishop to win
30. Qh3 Threatening checkmate ( Qd7+ Kf8 Bd6++ Kg8 Qxe8#
Kg8 Removes all ability for white to check
31. Be5 Qa8 Needing to push white off the f-file requires the queens support on the baseline
32. Bd6 Blunder
Rxd6 33. Raf1 Keeps black off the f-file, and ties blacks queen to the back rank
Qc8 Aiming at trading down or threating blacks queen getting to g4
34. Qc3 Rg6 Returning the rook to its best position
35. a4 Qa6 blacking and threatening the passed pawn
36. Qc5 protects the passed pawn. If Qxa4 then Qf8+ Rxf8 Rxf8#
Qxf1+ Queen sacrifice. Removes the threat of mate on black and threatens mate or serious material loss. Expected Kxf1 Bd3+ Re2 Rxe2 Qa7 ( The only place that keeps the queen safe from a discovered attack. If not Qa7 then the rook can be moved to attack the queen while at the same time the bishop gives check ) Rf6+ Kg1 Re1#
37. Rxf1 The easier win as follows
Rxg2+ 38. Kh1 Rg6+ Rf3 Bxf3# 0-1