Any help analysing my game?

[Site "Chess.com iPhone"]
[Date "03/03/2017 08:55pm"]
[White "ChessMate1278 (1583)"]
[Black "muharremzejnullahi (1714)"]

1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 e5 5.Nf5 d6 6.Nc3 g6 7.Ng3 Be6 8.Bb5 Qd7 9.O-O O-O-O 10.Bg5 f6 11.Be3 Kb8 12.Qd3 Qc8 13.Rad1 g5 14.Nf5 Bxf5 15.exf5 h5 16.Nd5 g4 17.Qa3 Nd4 18.Rxd4 exd4 19.Bxd4 b6 20.Nxb6 axb6 21.Bxb6 Qb7 22.Qa5 Rc8 23.Ba6 Qa8 24.Bxc8 Qxa5 25.Bxa5 Kxc8 26.g3 d5 27.Rd1 Ne7 28.Bb4 Nxf5 29.Bxf8 Rxf8 30.Rxd5 Ng7 31.b4 f5 32.Kf1 Rd8 33.Rxd8+ Kxd8 34.c4 Ne6 35.c5 f4 36.gxf4 Nxf4 37.b5 Kc7 38.b6+ Kc6 39.a4 Nd3 40.a5 Nxc5 41.Ke2 Kb7 42.Ke3 Ka6 43.Kd4 Nb7 44.Kd5 Nxa5 45.Kc5 Kb7 46.Kb5 Nc6 47.Kc5 Ne5 48.Kb5 Nf3 49.h4 gxh3

Hey all, I'm fairly new to this site and I was wondering if I could get a more experienced players input on my game. I'm not sure how to format it into a playable game thingy but hope posting the link will work.

 

1) learn about en passant

 

2) I feel you moved your King the wrong way strategically in the end. I'm no engine so I can't say for sure but keeping him busy taking your Queenside pawns while you take his pawns and try to advance on the Kingside might have been your best bet.

At the very least, had you taken his last two pawns with the King the game could not possibly have gotten worse than a draw for you.

...e5 in Sicilians is a little risky for Black since it leaves a gaping hole at d5 where White will want to plant a knight. That's one reason why 5. Nf5 didn't look right to me: since White wants to swing a knight over to d5, the fastest way to do that is Nc3-Nd5, which suggests putting the KN back at f3. I'd have to check a book or database to be sure, however.

7. Ng3 didn't look right to me for the same reason: 7. Ne3 followed soon by Nd5 looks like the correct plan.

10. Bg5 looks mostly like a lost tempo to me after 10...f6. Maybe you're trying to provoke a weakness on Black's kingside, but ...f6 doesn't weaken much, and you could have been using that time to launch a pawn storm at Black's king on the queenside.

18. Rxd4? Am I missing something, or does this just lose material? What was wrong with 18. Bxd4 exd4 19. Rxd4, which wins a pawn?

20. Nxb6. I would have more strongly considered 20. Bxb6 axb6 21. Nxb6, since that creates a greater immediate threat via an attack on the queen, and Qa8+. Right idea, wrong piece, I believe, but I'd have to look at it longer to be sure.

P.S.--20. Nxf6 Nxf6 21. Bxf6 looks good for White, too.

Thanks for the response sqod graf and Amadeus! Amadeus posted what I should've done in the endgame and it's basically what you said Graf, so it does work much better then what I actually did. I do know about en passant, although gonna check again with the chess.com lesson on it.

Thanks for the in-depth analysis sqod, putting the KN back on f3 looks like a good move and I didn't even consider it when analysing the game. Have no idea what I was doing with the bishop, and looking at after what you said it makes more sense to have just put it on e3 or something. With Rxd4 I was trying to clear up space to bring more of my pieces onto a attack on the enemy King, but it didn't work. Both your other variations are much better ideas :)

Would like to thank everyone again for helping me properly analyse it, the engine listed some moves as blunders or inaccuracies but I couldn't fully see why.

I would have played 31. Kg2 and wouldn't have swapped the rocks.

White had a brilliant attack that would have concluded in a win but for 24.Bxc8 which lost the advantage.  Also, a drawn endgame turned into a loss with 46.Kb5.  Very instructive and entertaining game.

 

I know White wants to get the rocks off , but 31. Kg2 is awfully passive, since Black will want to seize the e-file if he can, so I think 31. Kf1 would be better, though I still think any unprovoked king move is too passive at this point. Passed pawns must be pushed, so three passed pawns must be pushed-pushed-pushed.

P.S.--Great analysis, Clavius. So White *did* have a good reason for the rook sac: pressure on the a7-pawn, which forced a compromising pawn move in front of the king. Like you, I also kept kept wishing for White's unused rock/tank/castle-thingy to get involved in the attack, but I can see now that doing so would have eaten up a number of moves at a time I was hoping White already had a winning combo.

Thanks clavuis,for another great analysis. :)
I knew I had some sort of attack with the sacs, but I barely considered bringing the other rook in!

Very brilliant attack for a person of your given rating, but then the endgame shows some inexperience.

After move 30 the endgame is drawn with best play.  White has no hope of promoting a queenside pawn without support from the king so 31.Kf1 is the computer's choice which is not a passive move.  But white's pawns are not advanced very far, giving Black enough time to pick them off one by one.

Here is how it might go: