(;GM[1]FF[4]CA[UTF-8]AP[CGoban:2]ST[2] RU[Japanese]SZ[19]KM[0.00] PW[White]PB[Black]AW[ba][da][gb][bc][fc][gc][bd][cd][dd][ed]AB[fa][bb][db][fb][cc][dc][ec]C[What can black do here?] (;B[ea]CR[ea] ;W[ab]CR[ab] (;B[cb]CR[cb]C[RIGHT]) (;B[ca]CR[ca] ;W[cb]CR[cb]C[Ko. Black can do better.])) (;B[ab]CR[ab] ;W[cb]CR[cb] (;B[eb]CR[eb] ;W[ca]CR[ca]C[Black is dead]) (;B[ea]CR[ea] ;W[eb]CR[eb]) (;B[ca]CR[ca]C[Ko. Black can do better.])) (;B[cb]CR[cb] ;W[ga]CR[ga] (;B[ca]CR[ca] ;W[ea]CR[ea] ;B[eb]CR[eb] ;W[ab]CR[ab]) (;B[ab]CR[ab] ;W[eb]CR[eb] (;B[ca]CR[ca] ;W[ea]CR[ea]) (;B[ea]CR[ea] ;W[eb]CR[eb]))) (;B[ca]CR[ca] ;W[cb]CR[cb]C[Ko. Black can do better.]) (;B[eb]CR[eb] ;W[ca]CR[ca] (;B[ab]CR[ab] ;W[cb]CR[cb]) (;B[cb]CR[cb] ;W[ab]CR[ab])))