The black group on the left occured in a yesterday played 7x7 game. What can White do inside it to avoid defeat?!
(;GM[1]FF[4]CA[UTF-8]AP[CGoban:2]ST[2]
RU[Japanese]SZ[7]KM[0.50]
AW[ea][eb][gb][dc][fc][bd][cd][dd][ed][fd][gd][de][df][dg][eg]AB[ca][da][db][bc][cc][ad][be][ce][ee][fe][ge][cf][ef][gf][cg][fg]C[No komi, no prisoners -White to play and win!]PL[W]
(;W[ba]CR[ba]
;B[cb]CR[cb]
(;W[af]CR[af]
;B[ae]CR[ae]
(;W[ab]CR[ab]
;B[ac]CR[ac]
;W[bg]CR[bg]C[I like this seki :) RIGHT])
(;W[bg]CR[bg]
;B[ab]CR[ab]C[This is a jigo, too, but White will have to sacrifice three more stones, with a jigo as result.])
(;W[bb]CR[bb]
;B[ac]CR[ac]
;W[bg]CR[bg]
;B[ab]CR[ab]C[Also a seki - and a jigo, since black will capture three white stones in the upper left.]))
(;W[ab]CR[ab]
;B[ac]CR[ac]
;W[af]CR[af]
;B[bf]CR[bf]
(;W[bg]CR[bg]
;B[ag]CR[ag]C[There is no white ko threat])
(;W[ag]CR[ag]
;B[ae]CR[ae]C[This is a seki, too, but Black can capture three more stones in the lower left, making it a jigo.])
(;W[ae]CR[ae]
;B[ag]CR[ag]
;W[ae]CR[ae]
;B[af]CR[af]C[This is only a jigo!]))
(;W[bb]CR[bb]
;B[ac]CR[ac]
;W[af]CR[af]
;B[bf]CR[bf]
;W[bg]CR[bg]
;B[ag]CR[ag]C[There is no white ko threat.]))
(;W[af]CR[af]
;B[ae]CR[ae]
(;W[ba]CR[ba]
;B[cb]CR[cb]
(;W[ab]CR[ab]
;B[ac]CR[ac]
;W[bg]CR[bg]C[I like this seki :) RIGHT])
(;W[bg]CR[bg]
;B[ab]CR[ab]C[This is a seki, too, but White will have to sacrifice three more stones in the upper left, making the game a jigo.]))
(;W[bg]CR[bg]
;B[bb]CR[bb]))
(;W[ab]CR[ab]
;B[bb]CR[bb]
;W[ba]CR[ba]
;B[aa]CR[aa]
(;W[ae]CR[ae]
;B[ac]CR[ac]
;W[af]CR[af]
;B[bg]CR[bg]C[Black wins by two points!])
(;W[af]CR[af]
;B[ac]CR[ac]
;W[ae]CR[ae]
;B[bg]CR[bg]C[Black wins by two points!]))
(;W[bb]CR[bb]
;B[cb]CR[cb]
;W[ba]CR[ba]
;B[ac]CR[ac]
;W[af]CR[af]
;B[ae]CR[ae]
;W[bg]CR[bg]
;B[ab]CR[ab]))