[Retros] Mushikui Reconstruction mathematical(+retro) question

[Mu-Tsun Tsai]

> The type of piece that's captured isn't used, so that should be 'Ne6xf4+'

> (i.e. 7).

>

> This seems to work as 8 though:

> W: Kh1 Bd1 Ne2 Ne6 Ng2

> B: Kh5 Pf4

> Ne2xf4++

>

> Joost


I made a remark earlier that double checks are denoted simply by "+", not 
"++".

So indeed 7 is the length of the longest possible move string. Some 
possibilities includes:

(1) Capturing promotion and check(mate), like "cxd8=Q+"

(2) Disambiguous capture and check(mate), like "Qf6xg7#", as you mentioned

(3) En passant capture and check(mate), like "axb6ep+"

These are the only three possible types for a length 7 move.

Recall that the format I'm using is the same as described in PGN spec 
document,
except for the only difference being that I put "ep" to denote en passant.
I now call this the "PGNep" format. Here's the discussion on this issue.

http://www.pairlist.net/pipermail/retros/2011-May/003504.html


Mu-Tsun