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  International Draughts Rules: Notation 

I've played Draughts ever since I was a kid, but I've never liked its traditional notation system, in which the squares are numbered 1 to 50 as in the table below.

After I invented      the need for a better coordinate system arose. On the above 10x10 board one can fairly easily count the subsequent squares of a column - say 3-13-23-33-43 - but Bushka was at the time played on a 9x11 board and one would have to count 3-14-25-36-47. Similar 'uneasy' counts appear in 8x8 Draughts variants (3-11-19-27) and in the 12x12 canadian variant (3-15-27-39-51-63). One can easily understand why players of 64 variants tend to fall back on Chess notation!

Pondering the problem I focused on the fact that the diagonal subdomain of a square board is in fact a square tesselation itself, albeit 45 degrees rotated.
If one rotates a draughts board 45 degrees counterclockwise and applies a transparent square overlay, this is the picture one gets:

The coordinate system for the overlay is both usual and logical. So why not hang on to it when the board is rotated back, as in the table below!

The resulting notation system is easy to learn, concise and equally well applicable for every board size, even for a rectangular board like Bushka had in the early days!
It has excellent features. A non capturing move always keeps a particular line. The index change on that line is sufficient to indicate the move. Thus f45 and gf5 indicate moves of a white man or any king. This makes the system even more concise than Chess notation! One can also immediately see the direction of the move, depending on which index changes (letter=left).

A multiple piece-capture does not necessarily keep a particular line and may end on the square of origin. The 'x' sign comes behind the indices, for instance e8g6x, eg8x or f6x.
Putting the 'x' sign at the end gives it a fixed place. Otherwise it would appear left or right in for instance fxd4 and f4x6.
In      placing the index in between or at the end signifies the difference between linear capture and capture with a piece, a difference that, though non-existent in Draughts, yet shows the resource of the system.
Later I read in J.F. Moser's Pocket Encyclopedia for Draughts players that it has been suggested before by Canadian Draughts player Paul Sonier in 1925.

As can be seen throughout the Draughts section, another feature of the diagonal notation system is that the oblique lines can be indicated on the side of the board very much the same way ranks and files are indicated on a Chess board.

When you      moves may be entered either way.

Signs used in notation are:

!	Good move
!!	Very good move
?	Bad move
??	Blunder
!?	Doubtful
?!	Risky
=	Equal position