(;AB[db]AB[dc]AB[dd]AB[ce]AB[be]AW[bf]AW[cf]AW[df]AW[ee]AW[ed]AW[ec]AW[eb]AW[gb]AW[bh]C[Black to move]AW[ae]AW[de]AB[ac]AW[ba]AP[goproblems]
(;B[bb];W[da]
(;B[ca];W[cb]
(;B[cc];W[bd]
(;B[ca];W[ea]
(;B[bc];W[cb]C[Well done! :)RIGHT]MA[ca])
(;B[cd];W[cb]C[White still has B17 ko threat! :(]MA[ca])
(;B[aa];W[bc]C[:(]))
(;B[cd];W[ca]C[:(])
(;B[bc];W[ca]C[:(])
(;B[aa];W[ea]TR[bc]TR[ca]C[:(])
(;B[ea];W[fa]
(;B[ca];W[bc]
(;B[ea];W[ad]
(;B[ab];W[da]MA[ea]C[White still has a ko threat at C16! :(])
(;B[da];W[ab]C[:(])
(;B[aa];W[ab]C[Double ko! :(]MA[ac])
(;B[cd];W[ab];B[aa]MA[ba]C[Double ko! :(];W[da]MA[ea]C[Double ko! :(]))
(;B[aa];W[ea]C[:(])
(;B[ab];W[ea]C[:(])
(;B[cd];W[cb]C[:(]))
(;B[cd];W[ca]C[:(])
(;B[bc];W[ca]C[:(])
(;B[aa];W[ea]TR[bc]TR[ca]C[:(])))
(;B[bd];W[cc]C[:(]))
(;B[cc];W[bd]
(;B[ca];W[cb]MA[ca]
(;B[ea];W[fa]
(;B[ca];W[bc]
(;B[ea];W[ad]
(;B[ab];W[da]C[White still has a threat at C16! :(]MA[ea])
(;B[aa];W[ab]MA[ac]C[Double ko! :(])
(;B[da];W[ab]C[:(])
(;B[cd];W[ab];B[aa];W[da]MA[ea]C[Double ko! :(]))
(;B[ab];W[ea]C[:(])
(;B[aa];W[ea]C[:(]))
(;B[aa];W[ea]TR[bc]TR[ca]C[:(]))
(;B[bc];W[ca]C[:(])
(;B[cd];W[ca]C[:(])
(;B[aa];W[ea]C[:(]TR[bc]TR[ca]))
(;B[cd];W[ca]C[:(])
(;B[bc];W[ca]C[:(])
(;B[aa];W[ea]TR[ca]TR[bc]C[:(]))
(;B[bd];W[cc]C[:(])
(;B[cb];W[ca]C[:(]TR[bd]TR[cc])
(;B[ea];W[ca]C[:(])
(;B[aa];W[ca]C[:(]))
(;B[cb];W[bd]TR[bc]TR[cd]C[:(])
(;B[da];W[bd]TR[bc]TR[cd]C[:(])
(;B[bc];W[da]C[:(])
(;B[ca]C[];W[bc]
(;B[bb];W[ad]
(;B[ab];W[cc]C[:(])
(;B[cc];W[ab]C[:(])
(;B[aa];W[cc]C[:(]))
(;B[bd];W[ab]C[:(])
(;B[ad];W[bd]C[:(])
(;B[cd];W[bd]C[:(]))
(;B[bd];W[da]C[:(])
(;B[cc];W[da]C[:(])
(;B[ea];W[bd]TR[bc]TR[cd]C[:(])
(;B[ad];W[da]C[:(]))