(;GM[1]FF[4]CA[UTF-8]AP[CGoban:2]ST[2] RU[Japanese]SZ[4]KM[0.00] PW[Weiß]PB[Schwarz]AW[bb][cb][dc]AB[aa][ab][ac][bd][cd][dd]C[Black to play - what's the best he can do?] (;B[db]CR[db] (;W[bc]CR[bc] ;B[cc]CR[cc] ;W[ca]CR[ca]C[Seki, Black wins by one point ( 1 prisoner against 0) RIGHT]) (;W[cc]CR[cc] ;B[ca]CR[ca] ;W[da]CR[da] ;B[ba]CR[ba]C[White is lost]) (;W[da]CR[da] ;B[cc]CR[cc] ;W[db]CR[db] (;B[ba]CR[ba]C[White is lost ]) (;B[bc]CR[bc]C[White is lost]))) (;B[bc]CR[bc] ;W[ba]CR[ba]C[Black is dead!]) (;B[cc]CR[cc] ;W[db]CR[db] (;B[ba]CR[ba] ;W[bc]CR[bc]C[Black is dead!]) (;B[ca]CR[ca] ;W[bc]CR[bc]C[Black is dead!])) (;B[ca]CR[ca] ;W[ba]CR[ba] ;B[cc]CR[cc] ;W[db]CR[db]C[Seki, White wins by one point (1 prisoner against 0)]) (;B[ba]CR[ba] ;W[ca]CR[ca] ;B[cc]CR[cc] ;W[db]CR[db]C[Seki, and jigo!]))