(;GM[1]FF[4]CA[UTF-8]AP[CGoban:2]ST[2]
RU[Japanese]SZ[19]KM[0.00]
PW[White]PB[Black]AW[da][ab][db][ec][bd][cd][dd][ed][fd][ae][ge][ff][gf][gg][gh]AB[ea][cb][eb][fb][bc][dc][fc][gc][gd][id][be][ce][de][he][ef][if][bg][eg][hg][eh][hh][fi][hi][gj]LB[dc:1]C[how to answer black 1?]PL[W]
(;W[cc]CR[cc]
;B[ca]CR[ca]
(;W[dc]CR[dc]
;B[bb]CR[bb]
(;W[ba]CR[ba]
;B[aa]CR[aa]
(;W[ac]CR[ac]
;B[ad]CR[ad]
;W[ac]CR[ac]C[RIGHT
black dies in the corner, and white gets a live shape])
(;W[ad]CR[ad]
;B[ac]CR[ac]))
(;W[ac]CR[ac]
;B[ba]CR[ba]C[deado]))
(;W[bb]CR[bb]
;B[dc]CR[dc]
(;W[ba]CR[ba]C[alive, but white has lost points unnecessarily])
(;W[db]CR[db]
;B[ba]CR[ba])
(;W[ac]CR[ac]
;B[ba]CR[ba]))
(;W[ba]CR[ba]
;B[dc]CR[dc]
;W[bb]CR[bb]C[alive, but white has lost points for no compelling reason])
(;W[ac]CR[ac]
;B[dc]CR[dc]
;W[bb]CR[bb]
;B[ba]CR[ba]))
(;W[ca]CR[ca]
;B[ba]CR[ba])
(;W[bb]CR[bb]
;B[cc]CR[cc])
(;W[ba]CR[ba]
;B[ca]CR[ca]
(;W[cc]CR[cc]
;B[bb]CR[bb])
(;W[bb]CR[bb]
;B[cc]CR[cc])
(;W[db]CR[db]
;B[cc]CR[cc]))
(;W[ac]CR[ac]
;B[cc]CR[cc])
(;W[aa]CR[aa]
;B[cc]CR[cc])
(;W[af]CR[af]
;B[cc]CR[cc])
(;W[ee]CR[ee]
;B[ca]CR[ca])
(;W[fe]CR[fe]
;B[ca]CR[ca]))