This is the first problem of another set of 7x7 endgames, focusing on life & death this time. Can Black win this game?
(;GM[1]FF[4]CA[UTF-8]AP[CGoban:2]ST[2]
RU[Japanese]SZ[7]KM[0.50]TM[]
AW[eb][fb][gb][dc][ec][bd][cd][dd][ae][be][de][cf][df]AB[bb][cb][db][ac][bc][fc][gc][ad][ed][fd][ee][ef][ff]C[No komi, no prisoners - black to play and win!]
(;B[aa]CR[aa]
(;W[eg]CR[eg]
;B[fg]CR[fg]
;W[dg]CR[dg]
(;B[ea]CR[ea]
;W[fa]CR[fa]
;B[da]CR[da]C[ Black wins by one point! RIGHT CHOICE])
(;B[da]CR[da]
;W[ea]CR[ea]C[Jigo... Bd7 is wrong]))
(;W[da]CR[da]
;B[ca]CR[ca]
;W[ea]CR[ea]
(;B[dg]CR[dg]
;W[cg]CR[cg]
;B[eg]CR[eg]C[Black wins by one point! RIGHT CHOICE])
(;B[eg]CR[eg]
;W[dg]CR[dg]C[Jigo... BE1 is wrong])))
(;B[da]CR[da]
(;W[ea]CR[ea]
(;B[ba]CR[ba]
;W[eg]CR[eg]
;B[fg]CR[fg]
;W[dg]CR[dg]C[This is only a jigo....])
(;B[dg]CR[dg]
;W[cg]CR[cg]
;B[eg]CR[eg]
;W[ba]CR[ba]
;B[aa]CR[aa]
;W[ab]CR[ab]C[Now c7 is not possible (WE7 took away a liberty), so black collapses]))
(;W[ba]CR[ba]
;B[aa]CR[aa]
;W[ab]CR[ab]
;B[ca]CR[ca]C[So after D7 black is alive, but there is the problem of WE7 after BD8...!]))
(;B[ea]CR[ea]
;W[da]CR[da]C[Black is dead])
(;B[dg]CR[dg]
;W[da]CR[da]C[Black is dead]))