Currently supported SGF features (e=edit, v=view):
Variations (v,e)
B, W Normal moves (v,e)
PW, PB, DT, GN gameinfo for editing (v,e)
C comment texts (v,e)
CA, can read character sets supported by phone, saves UTF-8 (v).
Full SGF4 Gameinfo in root node (v)
AB, AW, AE move setup (v)
LB, L labels (v)
CR, TR, SQ, MA, SL, M markings (v)
TW, TB territory marking (v)
PL to set next to play in problem solving (v)
WV marker for wrong variations in problem solving (v)