In this game, white still have a chance to win. Find it ...
(;GM[1]FF[4]CA[UTF-8]AP[CGoban:2]ST[2]
RU[Japanese]SZ[7]KM[0.00]
PW[Blanc]PB[Noir]AW[dc][fc][gc][cd][gd][ce][de][ee][fe][ge][bf][cf]AB[cb][eb][fb][gb][cc][ec][bd][dd][ed][fd][be][af][bg]C[The komi is 6.5, white have to play and win the game.]PL[W]
(;W[bc]CR[bc]
;B[bb]CR[bb]
;W[ac]CR[ac]
;B[ab]CR[ab]
(;W[cg]CR[cg]
;B[ad]CR[ad]
(;W[fg]CR[fg]
;B[ae]CR[ae]
;W[ag]CR[ag]
;B[ef]CR[ef]
;W[ff]CR[ff]
;B[bg]CR[bg]
(;W[bc]CR[bc]
;B[ac]CR[ac]
;W[ag]CR[ag]C[RIGHT Black have no others ko-threads, he pass. White wins by 0.5 pts.])
(;W[ac]CR[ac]
;B[bc]CR[bc]
;W[ag]CR[ag]C[RIGHT Black have no others ko-threads, he pass. White wins by 0.5 pts.]))
(;W[eg]CR[eg]
;B[ae]CR[ae]
;W[ag]CR[ag]
;B[ef]CR[ef]
(;W[ff]CR[ff]
;B[bg]CR[bg]
(;W[bc]CR[bc]
;B[ac]CR[ac]
;W[ag]CR[ag]
;B[dg]CR[dg]
;W[df]CR[df]
;B[bg]CR[bg]C[White have no others ko-threads, he pass. White loses by 0.5 pts.])
(;W[ac]CR[ac]
;B[bc]CR[bc]
;W[ag]CR[ag]
;B[dg]CR[dg]
(;W[df]CR[df]
;B[bg]CR[bg]C[White have no others ko-threads, he pass. White loses by 0.5 pts.])
(;W[fg]CR[fg]
;B[bg]CR[bg]C[White have no others ko-threads, he pass. White loses by 0.5 pts.])))
(;W[fg]CR[fg]
;B[bg]CR[bg]
(;W[ac]CR[ac]
;B[bc]CR[bc]
;W[ag]CR[ag]
;B[ff]CR[ff]
(;W[df]CR[df]
;B[bg]CR[bg]C[White have no others ko-threads, he pass. White loses by 0.5 pts.])
(;W[gf]CR[gf]
;B[bg]CR[bg]C[White have no others ko-threads, he pass. White loses by 0.5 pts.]))
(;W[bc]CR[bc]
;B[ac]CR[ac]
;W[ag]CR[ag]
;B[ff]CR[ff]
(;W[gf]CR[gf]
;B[bg]CR[bg]C[White have no others ko-threads, he pass. White loses by 0.5 pts.])
(;W[df]CR[df]
;B[bg]CR[bg]C[White have no others ko-threads, he pass. White loses by 0.5 pts.])))))
(;W[fg]CR[fg]
;B[ad]CR[ad]
;W[cg]CR[cg]
;B[ae]CR[ae]
;W[ag]CR[ag]
;B[ef]CR[ef]
;W[ff]CR[ff]
;B[bg]CR[bg]
(;W[ac]CR[ac]
;B[bc]CR[bc]
;W[ag]CR[ag]C[RIGHT Black have no others ko-threads, he pass. White wins by 0.5 pts.])
(;W[bc]CR[bc]
;B[ac]CR[ac]
;W[ag]CR[ag]C[RIGHT Black have no others ko-threads, he pass. White wins by 0.5 pts.])))
(;W[cg]CR[cg]
;B[bc]CR[bc]
(;W[fg]CR[fg]
;B[ae]CR[ae]
;W[ag]CR[ag]
;B[ef]CR[ef]
;W[ff]CR[ff]
;B[bg]CR[bg]C[White have no others ko-threads, he pass. White loses by 0.5 pts.])
(;W[ag]CR[ag]
;B[ae]CR[ae]
(;W[fg]CR[fg]
;B[bg]CR[bg]C[White have no others ko-threads, he pass. White loses by 0.5 pts.])
(;W[bg]CR[bg]
;B[ef]CR[ef]
(;W[ff]CR[ff]
;B[fg]CR[fg]
(;W[df]CR[df]
;B[eg]CR[eg]
;W[gf]CR[gf]C[Seki .. big lose for White.])
(;W[eg]CR[eg]
;B[dg]CR[dg]C[White is dead.])
(;W[gg]CR[gg]
;B[eg]CR[eg]
(;W[dg]CR[dg]
;B[gf]CR[gf]C[White is dead.])
(;W[gf]TR[dg]CR[gf]C[White is dead (dead Seki, black can play in D1 and kill the group if he wants).])
(;W[df]CR[df]
;B[gf]CR[gf]C[White is dead.])))
(;W[fg]CR[fg]
;B[ff]CR[ff]
(;W[gf]CR[gf]
;B[eg]CR[eg]
(;W[gg]CR[gg]C[White is dead (dead Seki, black can play in D2 and kill the group if he wants).])
(;W[dg]CR[dg]
;B[gg]CR[gg]C[White is dead.])
(;W[df]CR[df]
;B[gg]CR[gg]C[White is dead.]))
(;W[eg]CR[eg]
;B[gf]CR[gf]
;W[dg]CR[dg]C[Seki .. big lose for White.]))
(;W[eg]CR[eg]
;B[ff]CR[ff]
(;W[df]CR[df]
;B[gf]CR[gf]C[White is dead.])
(;W[gf]CR[gf]
;B[fg]CR[fg]
(;W[dg]CR[dg]C[Seki .. big lose for White.])
(;W[df]CR[df]
;B[dg]CR[dg]C[White is dead.])))))))