(;GM[1]FF[4]CA[UTF-8]AP[CGoban:2]ST[2]
RU[Japanese]SZ[19]KM[0.00]TM[]
PW[White]PB[Black]AW[cn][ap][bp][cp][cq][dr][er]AB[gp][aq][bq][dq][eq][fq][ar][cr][gr][as][bs]C[what is white's best in the corner?]PL[W]
(;W[cs]CR[cs]
;B[ds]CR[ds]
(;W[es]CR[es]
;B[fs]CR[fs]
;W[cs]CR[cs]C[RIGHT
ko, and white takes first])
(;W[fs]CR[fs]
;B[fr]CR[fr])
(;W[fr]CR[fr]
;B[fs]CR[fs]))
(;W[ds]CR[ds]
;B[fr]CR[fr]C[white is lost])
(;W[es]CR[es]
;B[fs]CR[fs]
(;W[cs]CR[cs]
;B[ds]CR[ds]C[this is not the best ko, as black took first])
(;W[ds]CR[ds]
;B[fr]CR[fr]))
(;W[fs]CR[fs]
;B[fr]CR[fr]
(;W[cs]CR[cs]
;B[ds]CR[ds])
(;W[es]CR[es]
;B[gs]CR[gs]))
(;W[fr]CR[fr]
;B[ds]CR[ds]))