Remember, Qa2b3 means that there are three queens, potentially at a2, a4, and b4. All of them can move to b3.

??

I would interpret Qa2b3 to only mean that a Queen at a2 is moving to b3 - I don't know how you could derive the existence and position of two other Queens from this.

And from my playing experience I had thought that when two or more of the same piece could move to a given square, you added the minimal extra information to disambiguate, either the rank number or file letter. For example in the following position there are two rooks that can move Ra4, so to disambiguate I add the rank, thus R8a4.

  +---+---+---+---+---+---+---+---+
8 | R |   |   |   |   |   |   |   | 
  +---+---+---+---+---+---+---+---+
7 |   |   |   |   |   |   |   |   |
  +---+---+---+---+---+---+---+---+
6 |   |   |   |   |   |   |   |   |
  +---+---+---+---+---+---+---+---+
5 |   |   |   |   |   |   |   |   |
  +---+---+---+---+---+---+---+---+
4 |   |   |   |   |   |   |   |   |
  +---+---+---+---+---+---+---+---+
3 |   |   |   |   |   |   |   |   |
  +---+---+---+---+---+---+---+---+
2 |   |   |   |   |   |   |   |   |
  +---+---+---+---+---+---+---+---+
1 | R |   |   |   |   |   |   |   |
  +---+---+---+---+---+---+---+---+
    a   b   c   d   e   f   g   h

[download]

There is an excellent description of this notation at wikipedia

 

In reply to Re: Re: Parsing Chess Algebra Notation by EdwardG
in thread Parsing Chess Algebra Notation by cyocum

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