(;SZ[4]AW[ba]AW[ca]AW[db]AW[ac]AW[dc]AW[cd]AB[ab]AB[bb]AB[cc]C[Black to play - what's the best he can do?!]GM[1]FF[4]CA[UTF-8]AP[CGoban:2]ST[2]RU[Japanese]KM[0.00]PW[WeiÒŸ]PB[Schwarz]
(;B[bd]
(;W[cb]
(;B[bc]C[RIGHT];W[dd];B[ad]C[Seki, Black wins by one point (the prisoner)! RIGHT])
(;B[dd];W[bc];B[ad];W[bc];B[ac];W[cd]C[Black has lost!]))
(;W[dd];B[cb]C[This is not good for White :)])
(;W[bc];B[dd];W[cb];B[ad];W[bc];B[ac];W[cd]C[Black has lost!]))
(;B[bc];W[bd];B[ad];W[dd]
(;B[cb];W[ac]C[and White wins.])
(;B[ac];W[cb]C[White wins.])))