Hi
@frast,
your opponent realy played the opening very weird and pretty bad, losing two tempi in the first four moves.
Lets look into how you could have capitalized on that:
After 5...Nc6 you can indeed kick the Knight with d5, however I like to castle first before going into the attack. As a general rule you'll want your king in safety and as much developement as possible before attacking. Nethertheless d5 seems to work fine, so it is maybe just personal preference here.
7.Qe2, again castling might be a little better. The game could then go on like: 7. O-O d6 8.dxe6 Bxe6 9.Bxe6 fxe6 10.Ng5 Qd7 11.Qg4 Nf6 12.Qxe6 . After d6 there is no way to defend the e-pawn, but to abstain from d6 is equally bad as black can't develop his lightsquared bishop.
With 7...d6 your opponent threatens to close the center with e5, cutting of the Bc4 and Nc3 which are then blocked by their own pawns. You would have to regroup your pieces to start an attack, giving black the time to finish developement. Therefore you definitly should take on e6 now.
8...f6. Well the knight fork on f7 is a classic but I havn't seen it like this before. Having overlooked the possible fork it is logical to move the Bishop again. However h4 is not the best spot as after e5 the bishop is facing pawn-granite and practicly out of the game. Be3 was better.
Thankfully Nh6 was played instead. dxe6 is best giving you a good advantage.
12. Nd4 is bad. It allows: Bxd4 Rxd4 b5 Bb3 (if Bd3 c5 traps the rook) c5 Rd1 c4 trapping your bishop. As you noted in your analysis e5 is way better because fxe5 allows a tactic with Nd5. Another option was the imedeate Nd5. If Nxd5 then exd5 and if c6 you can choose between the safe Nf5 and the apparently winning sacrifice Nxf6.
14...b5. Black starts his own attack. Bd5 is better than Bd3. On d3 he will soon be attacked again by c4, followed by b4 and Qa5 and you are in serious trouble.
You are lucky your opponent didn't find Qa5 in the movesequence that followed in the game.
Well done in the end. Qh6 was cool.
About the analysis itself:
You are quite focused on pieces lining up and being pinned.
You have most of the tactical possibilites covered.
Sometimes in the game you move the right piece but to a bad square where its effectiveness is limited. Your analysis lacks the varaiations where you place the piece on a better square.
Overall it is a good analysis.
I hope this was helpfull and thanks for sharing your game.
Lukas