could i have won #42. Rd8

12. a3  Looks like a mistake

43.Re8 was a terrible blunder. you went from winning to losing in one move.

Just choose: 43. h7, 43.Rd8+. More than one way to win.

Now for the early stages of the game:

I don't really believe in the line white chose against Alekhine's defense.

But if you already chose this line, you have to play 9.Bxd3 and not 9.cxd3 which is quite a large inaccuracy. After 9...Nc6 black simply has a much better position.

After 11...e6 it almost seems like black has winning chances. At the very least a nice advantage.

You must defend your pawn with 12.Bf4. No choice.

After the central e pawn falls, the position is most likely either winning already of close to winning for black. White's only trump is his two bishops.

14.d4 helps black to win, with one fell swoop, white loses his only trump card, and gets his pawn structure really damaged. Considering white is already a pawn down, now the position is absolutely won for black. At this point, I was wondering how white got back to be in a winning position.

26...Rxc1 27.Kxc1 Rc7+ followed by Kg7 and Kg6 for example, is just an easy black win. So this is the first weird choice by black here (26...Rfc7. It's still much better and maybe winning, but not so easily anymore).

29.h6 would be my choice of how to give black a headache:) but white is struggling even after that.

30.h6 should lose instantly to 30...Kg6 and if Rh4 then e5 and black runs all over white.

After the strange 31...Kf6 32.Rg3, white has serious chances to draw the game all of a sudden.

A few moves later and a few strange moves, the position is very interesting again. White seems to have nothing to worry about anymore. Still, black shouldn't have any worries if he just plays  37...Re7 and simply threatens to bring the king over to force white's rook away from that pawn.

37...Rc4 is a dangerous but a lot more active way to play. Still, looks ok.

38...Rxd4? black loses the plot in my opinion, as rooks belong behind passed pawns (whether your own or your opponent's), and it'll be very hard to get there from d4, so 38...Rc2+.

In the game, probably 39.Rh8 is an instant win within a couple of moves.

I have reffered to the fiasco in the end in the beginning of this (very long) post.

dude! u should have gone 48. Rxe6! great move! u would have gotten queen!

There is no 48.Rxe6

42. Kg2 followed by Rd8+ was better.  Hell, even 41. Rd7+ would have been flamboyant, but winning.

thanks for the analysys grolitch with your help im able to see my mistakes more clearly and winning opurtonities that i missed.

this was a 5 min blitz game, he threw an opening at me that i didnt know.

so i should study positional and openings i geuss.