The GameType tag defines the type of the draughts game, including the size of the board and the preferred notation. It has been previously defined on [Grimminck].
The GameType tag has the following syntax:
GameType "Typenumber [,Start colour (W/B),Board width, Board height, Notation [,Invertflag]]"
A regular expression for the GameType tag is
"[09]+(,[WB],[09]+,[09]+,[ANS][0123](,[01])?)?"
The game type is a number followed by some optional attributes. Several numbers are predefined, as given by the following table. A test page for the GameType tag can be found at gametype.html.
Type  Game  Full details  Result type  Capture Separator 

0  Chess  
1  Chinese chess  
219  Future chess expansion  
20  10x10 International draughts  [GameType “20,W,10,10,N2,0”]  International  x 
21  English draughts  [GameType “21,B,8,8,N1,0”]  Default  x 
22  Italian draughts  [GameType “22,W,8,8,N2,1”]  Default  x 
23  American pool checkers  [GameType “23,B,8,8,N1,0”]  Default  x 
Pool checkers (unified) *)  [GameType “23,W,8,8,A0,0”]  Default  x  
Zimbabwean pool checkers *)  [GameType “23,W,8,8,A0,0”]  Default  x  
Jamaican draughts *)  [GameType “23,W,8,8,A1,1”]  Default  x  
24  Spanish draughts  [GameType “24,W,8,8,N1,1”]  Default  x 
25  Russian draughts  [GameType “25,W,8,8,A0,0”]  Default  : 
26  Brazilian draughts  [GameType “26,W,8,8,A0,0”]  Default  x 
27  Canadian draughts  [GameType “27,W,12,12,N2,0”]  International  x 
28  Portuguese draughts  [GameType “28,W,8,8,N1,1”]  Default  x 
29  Czech draughts  [GameType “29,W,8,8,A0,0”]  Default  x 
30  Turkish draughts  [GameType “30,W,8,8,A0,0”]  Default  x 
31  Thai draughts  [GameType “31,B,8,8,N2,0”]  Default   
40  Frisian draughts  [GameType “40,W,10,10,N2,0”]  Default  x 
41  Spantsiretti draughts  [GameType “41,W,10,8,A0,0”]  Default  : 
4249  Future draughts expansion  
50  Othello  
51..  Future expansion 
*) Note that Pool checkers and Jamaican draughts have been added later. They have the same rules as American pool checkers, but they use algebraic notation, and white moves first. Moreover, in Jamaican draughts the direction of the numbering is vertical instead of horizontal. Zimbabwean is played on the light squares. All checkers variants share the number 23, but the abbreviated version [GameType "23"] still expands to [GameType "23,B,8,8,N1,0"] (American pool checkers).
The game types 29, 30, 31, 40 and 41 are not listed in [Wikipedia], but they were added based on conventions of the game site Play OK and the program Aurora Borealis.
Attribute  Description 

Startcolour  Either W or B  white/black side starts 
Boardwidth  Width of board. 
Boardheight  Height of board. 
Notation  A character indicating the notation type
followed by a number indicating the location of the first square (A1 or 1) from the perspective of the starting player

Invertflag 

Important
The interpretation of the Invertflag has been changed! The previous interpretation (0 = Play on dark squares, 1 = Play on light squares) was not accurate for certain game types.
Note
The Startcolour field is just an indication for the colour of the pieces, but it has no influence on the notation.
Note
The principal direction of the notation is assumed to be horizontal. This means that square 2 is always to the left or to the right of square 1.
Note
Usually the game is played on the dark squares.
[GameType "0"] {Straight chess}
[GameType "0,W,8,8,S0"] {Straight chess with full spec}
[GameType "20"] {10x10 draughts}
[GameType "21,B,8,8,N1,0"] {English draughts with full spec}
Italian draughts uses the following notation:
For Italian draughts the first square (1) is located in the top left corner of the board. The next square (2) can be found by moving in horizontal direction to the right. Therefore Italian draughts gets the notation number 2, that corresponds with (Top left, horizontal).
American pool checkers uses the following notation:
Pool checkers uses the following notation:
Jamaican draughts uses the following notation: