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