(;GM[1]FF[4]CA[UTF-8]AP[CGoban:3]ST[2]RU[Japanese]SZ[19]KM[0.00]PW[white]PB[black]AW[db][gb][dc][ec][gc][hc][ed][gd][de][ee][fe]AB[ca][bb][hb][ib][bc][ic][cd][dd][hd][jd][ge][he][cf][df][ef][ff]C[it's easy for black to kill here];AW[cb]TR[cb]C[But with an another stone for white, it's black turn, what is white status ?](;B[fb];W[fa];B[fc];W[da]C[white is alive])(;B[fa];W[ga];B[da];W[ea];B[eb];W[fb]C[white is still alive])(;B[ea];W[fa];B[fb];W[ga]C[still alive])(;B[da];W[ea];B[fb];W[fc];B[ga];W[eb]C[white is alive])(;B[ga];W[fa];B[da](;W[ea];B[fb](;W[ha];B[fc];W[ba];B[ca]C[white is dead])(;W[ba];B[fc];W[ha];B[ca]C[still dead]))(;W[fc];B[ea];W[eb]C[status final = Ko !!])))