(;GM[1]FF[4]CA[UTF-8]AP[CGoban:2]ST[2] RU[Japanese]SZ[4]KM[0.00] PW[Weiß]PB[Schwarz]AW[da][bb][ac][bc][dd]AB[aa][cb][db][cc][ad]C[Black to play - what's his best result?] (;B[cd]CR[cd] (;W[ba]CR[ba] (;B[bd]CR[bd]C[White can't play c4, so he is dead RIGHT]) (;B[ca]CR[ca] ;W[bd]CR[bd]C[This is only a jigo....])) (;W[ca]CR[ca] ;B[ba]CR[ba] ;W[ca]CR[ca] (;B[da]CR[da] ;W[bd]CR[bd] ;B[dc]CR[dc]C[Seki, Black wins by three points (4 prisoners against 1)]) (;B[bd]CR[bd] ;W[ab]CR[ab] ;B[ba]CR[ba]C[White is dead]))) (;B[ca]CR[ca] ;W[bd]CR[bd] (;B[ba]CR[ba] ;W[cd]CR[cd]C[This is only a jigo - seki....]) (;B[cd]CR[cd] ;W[ba]CR[ba]C[This is only a jigo])) (;B[ba]CR[ba] ;W[cd]CR[cd]C[This is only a jigo - seki]) (;B[dc]CR[dc] ;W[ba]CR[ba] (;B[cd]CR[cd] ;W[ca]CR[ca]C[White wins!]) (;B[ca]CR[ca] (;W[cd]CR[cd] ;B[bd]CR[bd] ;W[cd]CR[cd] ;B[bd]CR[bd] ;W[ad]CR[ad]C[Seki, White wins by one point (4 prisoners against 3)]) (;W[bd]CR[bd] ;B[cd]CR[cd]C[White wins by one point!]))) (;B[bd]CR[bd] ;W[cd]CR[cd] ;B[bd]CR[bd] ;W[ba]CR[ba] (;B[ca]CR[ca] ;W[ad]CR[ad]C[Black is lost]) (;B[dc]CR[dc] (;W[ca]CR[ca] ;B[cd]CR[cd] ;W[ab]CR[ab]C[Seki, White wins by one point (3 prisoners against 2)]) (;W[cd]CR[cd] ;B[ca]CR[ca] ;W[ad]CR[ad]C[Seki, White wins by one point (4 prisoners against 3)]))))