(;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]))