(;GM[1]FF[4]CA[UTF-8]AP[CGoban:2]ST[2] RU[Japanese]SZ[4]KM[0.00] PW[Weiß]PB[Schwarz]AW[ca][ab][bb][cb]AB[da][ac][bc][cc][dd]C[Black to play - what's the best he can do?] (;B[db]CR[db] (;W[bd]CR[bd]C[W D2 is a variation] (;B[dc]CR[dc] ;W[cd]CR[cd]C[White wins!]) (;B[ba]CR[ba] ;W[dc]CR[dc] ;B[db]CR[db] ;W[aa]CR[aa] ;B[dc]CR[dc] ;W[cd]CR[cd] ;B[ad]CR[ad] ;W[bd]CR[bd] ;B[cd]CR[cd]C[Black wins by one point - 4 prisoners against 3. RIGHT]) (;B[cd]CR[cd] ;W[dc]CR[dc] ;B[db]CR[db] ;W[da]CR[da] ;B[ba]CR[ba] ;W[dc]CR[dc]C[White wins!]) (;B[ad]CR[ad] ;W[dc]CR[dc] ;B[db]CR[db] ;W[da]CR[da] ;B[ba]CR[ba] ;W[dc]CR[dc]C[White wins!]) (;B[aa]CR[aa] ;W[dc]CR[dc] ;B[db]CR[db] ;W[ba]CR[ba] ;B[dc]CR[dc] ;W[cd]CR[cd] ;B[ad]CR[ad] ;W[cd]CR[cd] ;B[bd]CR[bd]C[Black wins by one point - 4 prisoners against 3. RIGHT])) (;W[dc]CR[dc] ;B[db]CR[db] ;W[bd]CR[bd] (;B[ba]CR[ba] ;W[aa]CR[aa] ;B[dc]CR[dc] ;W[cd]CR[cd] ;B[ad]CR[ad] ;W[bd]CR[bd] ;B[cd]CR[cd]C[Black wins by one point - 4 prisoners against 3. RIGHT]) (;B[dc]CR[dc] ;W[ad]CR[ad] ;B[cd]CR[cd]C[Black wins by one point - 3 prisoners against 2. RIGHT]))) (;B[dc]CR[dc] ;W[bd]CR[bd] ;B[db]CR[db] ;W[ad]CR[ad]C[Black loses the capturing race]) (;B[bd]CR[bd] ;W[db]CR[db] ;B[dc]CR[dc]C[White wins by two points!]))