(;GM[1]FF[4]CA[UTF-8]AP[CGoban:2]ST[2] RU[Japanese]SZ[4]KM[0.00] PW[Weiß]PB[Schwarz]AW[ba][bb][ac][cc][ad][cd]AB[ca][ab][cb][dc][dd]C[Black to play - what's the best he can do?] ;B[bc]CR[bc] (;W[db]CR[db] ;B[aa]CR[aa] (;W[bd]CR[bd] (;B[bb]CR[bb] ;W[dc]CR[dc]C[Seki & Jigo (2 prisoners each)! RIGHT]) (;B[dc]CR[dc] ;W[bb]CR[bb]C[Uh oh... White wins!]) (;B[da]CR[da] ;W[bb]CR[bb]C[Uh oh... White wins!])) (;W[bb]CR[bb] ;B[bd]CR[bd] ;W[ac]CR[ac]C[Nice try, but since there is no stone at D4, Black can capture at B4.])) (;W[bd]CR[bd] ;B[bc]CR[bc]C[This was easy :)]) (;W[aa]CR[aa] ;B[ab]CR[ab]C[This was easy :)]))