All (game-specific) property values are case insensitive.
The default board size is 11 x 11. The minimum size for a row or a column is 1. If a board is asymmetric, the SZ property should specify [number_of_columns : number_of_rows] in line with the SGF FF specification.
Black tries to connect the top and bottom of the board; White tries to connect the left and right sides.
The default first player is Black.
If there are more than 26 columns, they are identified by base-26 alphabet numbers, i.e., the next columns after z are aa, ab, ac, ..., az, ba, bb, and so on. The next column after zz is aaa.
Column labels are case insensitive. Examples: [a1], [G5], [D11], [aA27], [AB6].
Example normal moves: B[e4], W[F9].
The following moves are special:
Example special moves: B[resign], W[swap-pieces], B[forfeit].
Property: IS Propvalue: list of composed SimpleText ':' SimpleText Propertytype: root Function: This property allows applications to store and read an initial viewer setting. The property value is a list of "keyword followed by ':' followed by either 'on' or 'off'". Valid keywords are: 'tried' - identify future moves that have been tried? 'marked' - show good/bad move markings? 'lastmove' - identify the last cell played? 'headings' - display column/row headings (a b.., 1 2..)? 'lock' - lock the game against new moves (for analysis)? This property is allowed in the root node only. Example: IS[tried:on][lock:off][marked:off] Property: IP Propvalue: SimpleText Propertytype: game-info Function: Designates the initial position that the viewer should display. It will most frequently indicate the current position of play in the game. This is necessary because future possible moves may have been explored, and the user must be able to distinguish real moves actually made from exploratory moves. More than one IP property in a game is illegal, and the behaviour undefined. The property value should be empty (""); it is specified as SimpleText for compatibility.