Do you mean why is this position winning or how come you won the game?
why did i win? confused.


LDSSDL, it was all over at move 35, my threat was Rxa6 which transposes to the position that was played, but thanks for the remarks.
as for the pressure in the centre, once i saw that his pawn chain pointed at my king, and mine pointed at his queenside i had to attack first.
i kept the centre locked to keep his bishop out of play, but if i had to i would have opened it.


thanks, that makes sense to me, now i feel i have a better grip (i've been studying it too) on this game.
it probably seems silly to you, but every so often i play a game which surprises me, and it's good to discuss it.
thanks everybody
xxx ooo
EL
About your opening...e3 is a little passive. If you want it, you should play the bishop outside the pawn chain first. Much better, I think, is 5. e4 d6 6. Be2 and then either ...e5 or ...Nf6 (probably both eventually).
That fianchettoed bishop isn't weak, it just wasn't utilized. White normally counters it with a queen and bishop lined up on h6, where the bishop is either traded off, leaving dark square holes around the king (which brings playing for ...Bxh6 Qxh6, and Ng5 into the strategy), or the black bishop retreats to h8, where the white bishop holds some important territory. You played on the queenside, which is fine, but you really needed to use your bishop more. Instead, you locked it out with your c5 and c4 pushes. That's almost never a good idea. Better is cxd5 exd5, c4 where the center is pressured better and your bishop can gain some scope.
Up until 7. O-O this position appears to be book, except that i am not impressed with black's fianchetto, which looks weak to me.
7. ... Bf5 ?! // should complete development
11. Qxd3 // punishes previous error, now black looks weaker
16. c4 // the attack begins
20. cxd5 exd5 // forces black to choose which pawn structure he wants
// (but 20. ... cxd5 is no better)
23. a5 !? a6 ? // speculative move panics black
35. Rb6 ! // threatens 36. Rxa6 b7xQ 37. QxR+ QxQ 38. RxQ+ Kg7 39. Rb6! wins
35. ....... Ree8 ? // but there is nothing better.
and we transpose to 39. Rb6! winning quickly
However, i am not happy with this game, because i still do not understand why i won ... i know i'm not seeing deep enough into this position, and i have the uneasy feeling that i could have lost just as easily,