Hi all, I am gonna try annotating my own game and maybe master games as well. I will need your help to corrected my view or ideas or if you have a better way of saying it feel free to say it here.
Questions- How do you know when is it the end of the book move ? and can you tell me when the opening stage finish ? ( In this game here) I know that there no hard and fast rule about this one.
So let begin, here the game down below.
Opening Annotated 1


Is 6.e3 is the end of the book move because the usual reply should be f3 ?
Do you think around move 12.0-0 ? is the end of the opening stage ?

a3 is not very strong, there are 2 better options
1. play Qc3, Qb3 or Bd2 to prevent doubled pawns
2. play e3 or Nf3 and wait for black to take on c3 without wasting a tempo on 4. a3
a3 is a move which can be saved for later since black cannot move the bishop back after a3 because that would waste a tempo.

4.a3 is one of the response to the Nimzo-Indian defense and also is called the Samisch Variation. Yes you are right lastwarrior about the other possible white's fourth move as you mention earlier including e3.

"The Samisch Variation (4.a3) is an arrogant reaction, investing a tempo to force Black to implement his strategy of doubling the white c-pawns. White tries to start an immediate attack by expanding in the centre and smoking out the opposing king.This show of aggression is not to be taken lightly and Black needs to be well acquainted with the dangers which lie in store for him in order to react properly. "
source: BCO, Garry Kasparov and Raymond Keene
Using Garry Kasparov as a reference, It's hard to argue with that, Although one could simply say he's a grandmaster, as we are not?. Which moves smoked out the opposing king?

I don't think 11.f3 was the best idea, there wasn't any reason to play it at the time. Your e4 pawn wasn't threatened, I think 11.0-0 would have been better.
13.g3 wasn't very good either, I understand you were trying to prevent Nf4, but it's not that much of a threat.

after 6 ... c5
i'd think to take 7.dxc5 dxc5 8.Qxd8+ with the king forced to recapture, trapping it in the middle with a wide open queen side to attack. white should be better from there?
i know it's an old thread, but i like to get in the last word when possible :-P
hey kco! you still living in perth? message me if you want to play over the board some time :-)
and the best definition i've seen for the end of the opening is when all your pieces are developed.
1.d4 attacking the c4 and e5 sq. free the black sq bishop Nf6 attaaking the e4 sq and protecting the d5 sq. 2.c4 getting another pawn to the central sq to eye on e5 sq. e6 preparing for d5. 3.Nc3 develop a piece and getting incontrol of the d5 sq. Bb4 pinning the knight. 4.a3 the Samisch Variation, as it pointed earlier is it kind of weak, lose a tempo, so why not develope another piece like the 4.Qc2 The Classical Variation is pointed it out that move is too tame from the BCO or 4.e3 The Rubinstein Varaition which continues to be the main line of the Nimzo-Indian.