White to play and get the best life and death result. If black is unconditionally alive with points, play at 'T' (N13). I thought this one wouldn't be too difficult, but based on the rating, I might have been wrong. Please flag or comment if there is a mistake.
(
;
AB [ih][jh][kh][li][lj][lk][il][jl][kl][hi][hj][hk]
AW [gi][gj][gk][hl][im][jm][km][ll][mk][mj][mi][lg][mh][kg][jg][ig][hh]
C [White to play and get the best life and death result. If black is unconditionally alive with points, play at 'T' (N13).]
LB [mg:T]
(
; W [jj]; B [kk]
(; W [ii]; B [ik] (; W [ji]; B [ki]; W [ij] C [RIGHT][Correct.])(; W [ki]; B [lh]; W [ji] C [Seki.])(; W [lh]; B [ki] C [It looks like a rabbity six, but the stone on J11 makes it a seki.])(; W [ij]; B [ji] C [Seki.])(; W [kj]; B [ki] C [Alive.])(; W [jk]; B [ji] C [Alive.]))
(; W [lh]; B [ii] C [Seki.])
(; W [ki]; B [ii] C [Seki.])
(; W [ik]; B [ii] C [Seki.])
(; W [ji]; B [ij] C [Seki.])
(; W [kj]; B [ij] TR [jk][ji] C [Miai for life.])
(; W [jk]; B [ji] TR [kj][ij] C [Miai for life.])
(; W [ij]; B [ji] C [Seki.])
)
(; W [lh]; B [jj])
(; W [ii]; B [jj])
(; W [ji]; B [jj])
(; W [ki]; B [jj])
(; W [ij]; B [jj])
(; W [kj]; B [jj])
(; W [ik]; B [jj])
(; W [jk]; B [jj])
(; W [kk]; B [jj])
(; W [mg]; B [jj] C [You missed your chance!])
)