(;GM[1]FF[4]CA[UTF-8]AP[CGoban:3]ST[2] RU[Japanese]SZ[9]KM[0.00] PW[White]PB[Black]AW[da][bb][cb][eb][fb][cc][hc][cd][hd][de][he][ef][if][fg][gg][hg][hh]AB[db][dc][ec][fc][gc][ed][gd][fe][ge][gf][hf] (;B[hb] ;W[gb] (;B[ia] ;W[ie] ;B[ea] ;W[fa] ;B[ga] ;W[ha]C[Not the best ko (0 local ko-threads)]) (;B[ie] ;W[id] (;B[ea] ;W[fa] ;B[ia] ;W[ie] ;B[ga] ;W[ha]C[Not the best ko (0 local ko-threads)]) (;B[ia] ;W[ea] ;B[ic] ;W[ib]C[Not the best ko (0 local ko-threads)])) (;B[ea] ;W[fa] (;B[ie] ;W[id] ;B[ia] ;W[ie] ;B[ga] ;W[ha]C[Not the best ko (0 local ko-threads)]) (;B[ia] ;W[ie] ;B[ga] ;W[ha]C[Not the best ko (0 local ko-threads)])) (;B[ig] ;W[ie]) (;B[ca] ;W[ea])) (;B[gb] ;W[ea] (;B[hb] ;W[ib] (;B[ie] ;W[id] (;B[ia] ;W[ig] (;B[ic] ;W[ie] (;B[ga] ;W[ib]C[RIGHT Best ko for black (+ 2 local ko-threats)]) (;B[ca] ;W[ba]C[- 1 ko-threat])) (;B[ca] ;W[ba]C[- 1 ko-threat])) (;B[ga] ;W[ia]) (;B[ig] ;W[ih] (;B[ia] ;W[ig] (;B[ic] ;W[ie] (;B[ga] ;W[ib]C[RIGHT Best ko for black (+ 2 local ko-threats)]) (;B[ca] ;W[ba]C[- 1 ko-threat])) (;B[ca] ;W[ba]C[- 1 ko-threat])) (;B[ca] ;W[ba]C[- 1 ko-threat])) (;B[ca] ;W[ba]C[- 1 ko-threat])) (;B[ic] ;W[ie] (;B[ia] ;W[ga]) (;B[ga] ;W[ia])) (;B[ia] ;W[ie] (;B[ic] ;W[ga]) (;B[ga] ;W[ic])) (;B[ga] ;W[ia]) (;B[ig] ;W[ie] (;B[ic] ;W[ih] (;B[ia] ;W[ga]) (;B[ga] ;W[ia])) (;B[ia] ;W[ih]) (;B[ga] ;W[ic]))) (;B[ie] ;W[hb] (;B[ig] ;W[ga]) (;B[ha] ;W[id]) (;B[ga] ;W[id]))) (;B[ea] ;W[gb] (;B[ca] ;W[hb]) (;B[hb] ;W[ha] (;B[ib] ;W[fa]) (;B[ca] ;W[ib])) (;B[ie] ;W[hb])) (;B[ga] ;W[ea]) (;B[ie] ;W[gb]))