(;GM[1]FF[4]CA[UTF-8]AP[CGoban:2]ST[2] RU[Japanese]SZ[4]KM[0.00] PW[Weiß]PB[Schwarz]AW[ab][ac][dc]AB[da][db][ad][bd][cd]C[Black to play - what's the best he can do?] (;B[cb]CR[cb] ;W[bb]CR[bb] (;B[cc]CR[cc] ;W[ba]LB[dd:A]CR[ba]C[Please play A now...] ;B[dd]CR[dd]C[Seki, Black wins by one point (the prisoner) RIGHT]) (;B[bc]CR[bc] ;W[ba]CR[ba]C[Seki, Black wins by one point (the prisoner). RIGHT])) (;B[cc]CR[cc] ;W[cb]CR[cb] ;B[bb]CR[bb] ;W[ba]CR[ba]C[White wins!]) (;B[bb]CR[bb] ;W[cc]CR[cc] ;B[bc]CR[bc] ;W[cb]CR[cb] (;B[ba]CR[ba] ;W[ca]LB[aa:A]CR[ca]C[Please play A now.] ;B[aa]CR[aa]C[Seki & jigo (two prisoners each)]) (;B[aa]CR[aa] ;W[ca]CR[ca] (;B[ba]CR[ba]C[Seki & jigo (2 prisoners each)]) (;B[dd]CR[dd] ;W[ba]CR[ba]C[White wins.]))) (;B[bc]CR[bc] ;W[cb]CR[cb] ;B[bb]CR[bb] ;W[cc]CR[cc] ;B[ba]CR[ba] ;W[ca]LB[aa:A]CR[ca]C[Please play A now.] ;B[aa]CR[aa]C[Seki & jigo (two prisoners each)]))