(;GM[1]FF[4]CA[UTF-8]AP[CGoban:2]ST[2] RU[Japanese]SZ[4]KM[0.00] PW[Weiß]PB[Schwarz]AW[aa][ab][cb][ac][cc][cd][dd]AB[da][bb][db][bc][dc][ad]C[Black to play - what's the best he can do?] (;B[ca]CR[ca] ;W[ba]CR[ba] ;B[ca]CR[ca] ;W[bd]CR[bd] (;B[ac]CR[ac] ;W[db]CR[db] ;B[ba]CR[ba] ;W[ab]CR[ab] ;B[aa]CR[aa]C[Seki! Black wins by one point - 5 prisoners against 4. RIGHT]) (;B[db]CR[db] ;W[ac]CR[ac] ;B[ab]CR[ab] ;W[ba]CR[ba] ;B[ad]CR[ad] ;W[da]CR[da]C[White wins!])) (;B[ba]CR[ba] ;W[ca]CR[ca] (;B[db]CR[db] (;W[bd]CR[bd]C[Black loses the capturing race]) (;W[ab]CR[ab]C[This is a mistake!] ;B[dc]CR[dc] ;W[da]CR[da] ;B[db]CR[db] ;W[aa]CR[aa] ;B[ac]CR[ac] ;W[ab]CR[ab]C[Jigo!])) (;B[bd]CR[bd] ;W[ab]CR[ab]C[Black loses the capturing race])))