SGF Support Spec for BKGo
=========================
   27 March 1999

Here are the 13 property-codes that the initial release of BKGo will
support; they are exactly sufficient for sending the state of a
GoBoard object to a data stream.

When reading an SGF stream, the parser will store *all* properties it
can find, even if it doesn't understand them.  When GoBoard executes a
newly-contsructed GameTree, it will simply ignore unrecognized
properties.  Although BKGo will correctly read in and store "branches"
of the SGF tree, it will *not* execute alternate branches of gameplay
(i.e if a node has more than one child).  For now, it will simply
execute the "main" line of play by only traversing to a node's first
child.

Root Node Codes (for "game setup"):
---------------
PW, PB  -- names of the players
DT      -- the date
GN      -- GameName, i.e. filename 
AP, CP  -- Computer application & version, Copyright info
GM      -- type of Game (i.e. Go, Chess, etc.) -- always "1" !
FF      -- version of SGF file -- always "4" !
SZ      -- size of board

Game Play Codes
---------------
B, W    -- black/white's move, expressed in coordinates [a-s],[a-s] (or [])
MN      -- move number (keep our nodes numbered for future use!)
C       -- Comment from chat window



Therefore, standard BKGo SGF output will have nine pieces of
information in its "root" node (the first paragraph), and then each
line will represent a new "move" node:

(;FF[4] GM[1] SZ[19]
AP[BKGo:0.7] CP[GnuGPL 2] GN[savegame.sgf]
PW[Karl] PB[Ben] DT[1999-03-27]

;MN[1] B[fh] C[Ben: good start.]
;MN[2] W[qs]
;MN[3] B[fg]
;MN[4] W[fi] C[Karl: take that!]
)