(;GM[1]FF[4]CA[UTF-8]AP[CGoban:2]ST[2]
RU[Japanese]SZ[4]KM[0.00]
PW[Weiß]PB[Schwarz]AW[db]AB[ca][ac][ad][bd][cd][dd]C[White to play - what's his best result?]PL[W]
(;W[bb]CR[bb]
(;B[cb]CR[cb]
;W[cc]CR[cc]
(;B[bc]CR[bc]
;W[ab]CR[ab]C[A snapback - white wins.... RIGHT CHOICE])
(;B[dc]CR[dc]
(;W[ab]CR[ab]
;B[da]CR[da]
;W[bc]CR[bc]C[White wins! RIGHT CHOICE])
(;W[bc]CR[bc]
;B[da]CR[da]
(;W[ab]CR[ab]C[White wins! RIGHT CHOICE])
(;W[ba]CR[ba]C[White wins! RIGHT CHOICE]))))
(;B[ab]CR[ab]
;W[ba]CR[ba]C[Black is lost]))
(;W[cb]CR[cb]
;B[bb]CR[bb]C[W C3 doesn't work]))