(;GM[1]FF[4]CA[UTF-8]AP[CGoban:2]ST[2]SZ[13]AW[cb][dc][bd][cd][dd][ae]AB[db][eb][fc][be][ce][de][ee][bg]RU[Japanese]TM[]PW[White]PB[Black]C[Black plays, White dies. (Be careful of a Ko.) ](;B[ba]CR[ba];W[ca]CR[ca];B[bb]CR[bb];W[bc]CR[bc](;B[da]CR[da]C[RIGHT B13 is the vital point. After White C13, Black B12 destroys White's eye shape. ])(;B[ab]CR[ab];W[ac]CR[ac]))(;B[bb]CR[bb];W[ba]CR[ba](;B[bc]CR[bc];W[ab]CR[ab];B[ac]CR[ac];W[ad]CR[ad];B[aa]CR[aa]C[White gets a ko.])(;B[ac]CR[ac];W[bc]CR[bc]))(;B[ac]CR[ac];W[bb]CR[bb](;B[bc]CR[bc];W[ab]CR[ab](;B[ca]CR[ca];W[ba]CR[ba];B[af]CR[af];W[ad]CR[ad])(;B[ba]CR[ba];W[ca]CR[ca]))(;B[ab]CR[ab];W[bc]CR[bc](;B[ca]CR[ca];W[ba]CR[ba])(;B[ba]CR[ba];W[ca]CR[ca];B[aa]CR[aa];W[ad]CR[ad])(;B[af]CR[af];W[ad]CR[ad](;B[ba]CR[ba];W[ca]CR[ca];B[da]CR[da];W[aa]CR[aa])(;B[ca]CR[ca];W[ba]CR[ba])))(;B[ba]CR[ba];W[ab]CR[ab];B[ca]CR[ca];W[bc]CR[bc](;B[af]CR[af];W[ad]CR[ad])(;B[aa]CR[aa];W[da]CR[da])))(;B[ab];W[bb](;B[ad];W[ac])(;B[bc];W[ad])))