A ko fight after all! True, it's only a short one, but positions like this occur all the time during real games, so it should be an useful exercise.
(;GM[1]FF[4]CA[UTF-8]AP[CGoban:2]ST[2]
RU[Japanese]SZ[7]KM[0.50]TM[]
AW[db][dc][ec][fc][dd][fd][gd][de][fe][bf][cf][ef]AB[ca][da][cb][eb][fb][gb][cc][gc][cd][be][ce][af]C[No komi, no prisoners - black to play and win!]
(;B[bg]CR[bg]
;W[cg]CR[cg]
(;B[ae]CR[ae]
;W[ag]CR[ag]
(;B[df]CR[df]
;W[dg]CR[dg]
;B[bg]CR[bg]
;W[ea]CR[ea]
(;B[fa]CR[fa]
;W[ag]CR[ag]
;B[eg]CR[eg]
;W[fg]CR[fg]
;B[bg]CR[bg]C[Black connects the ko and wins by one point RIGHT])
(;B[ag]CR[ag]
;W[fa]CR[fa]
;B[ga]CR[ga]
;W[ea]CR[ea]
;B[fa]CR[fa]
;W[ea]CR[ea]C[E7 was a ko theat!]))
(;B[dg]CR[dg]
;W[df]CR[df]
;B[bg]CR[bg]
;W[ea]CR[ea]
(;B[fa]CR[fa]
;W[ag]CR[ag]C[Black has no more ko threats, so white will connect - jigo!
])
(;B[ag]CR[ag]
;W[fa]CR[fa]
;B[ga]CR[ga]
;W[ea]CR[ea]
;B[fa]CR[fa]
;W[ea]CR[ea]C[e7 was a ko threat!]))
(;B[eg]CR[eg]
;W[df]CR[df]
;B[bg]CR[bg]
;W[ea]CR[ea]
(;B[fa]CR[fa]
;W[ag]CR[ag]C[Black is a ko threat short, so white will connect and secure a jigo])
(;B[ag]CR[ag]
;W[fa]CR[fa]
;B[ga]CR[ga]
;W[ea]CR[ea]
;B[fa]CR[fa]
;W[ea]CR[ea]C[E7 was a ko threat....])))
(;B[dg]CR[dg]
;W[df]CR[df]
;B[ae]CR[ae]
;W[ag]CR[ag]C[white will connect next - jigo!]))
(;B[ae]CR[ae]
;W[bg]CR[bg]C[Connecting is secure but leads to a jigo])
(;B[ag]CR[ag]
;W[bg]CR[bg]
;B[ae]CR[ae]C[This is only a jigo.]))