(;AB[aa]AB[ac]AB[bc]AB[cc]AB[dc]AB[eb]AB[ea]AW[fb]AW[ec]AW[ed]AW[gc]AW[dd]AW[cd]AW[bd]AW[ad]LB[fe:Yes]LB[ff:No]C[Can black safely tenuki?FORCE]AP[goproblems]
(;B[ff];W[fe]AW[aa]AW[ac]AW[bc]AW[cc]AW[dc]AW[eb]AW[ea]AB[ad]AB[bd]AB[cd]AB[dd]AB[ed]AB[ec]AB[fb]AB[gc]C[Why?]
(;B[ca];W[cb]
(;B[ba];W[bb];B[ab]C[Correct, a ko for life.RIGHT])
(;B[fa];W[ba])
(;B[bb];W[da]
(;B[fa];W[ba])
(;B[ba];W[ab]))
(;B[da];W[ba]))
(;B[ba];W[ca]
(;B[ab];W[bb])
(;B[bb];W[cb])
(;B[cb];W[bb])
(;B[db];W[bb])
(;B[da];W[db])
(;B[fa];W[bb]))
(;B[ab]C[Very funny])
(;B[bb];W[ca]
(;B[ba];W[cb])
(;B[ab];W[cb])
(;B[cb];W[db])
(;B[db];W[cb])
(;B[fa];W[cb])
(;B[da]C[Very funny];W[cb]))
(;B[cb];W[ca]
(;B[bb];W[db])
(;B[db];W[bb])
(;B[fa];W[bb])
(;B[ba]C[];W[bb])
(;B[ab]C[Very funny])
(;B[da]C[Very funny];W[db]))
(;B[db];W[cb]
(;B[ca];W[ba])
(;B[fa];W[da]))
(;B[da];W[ca]
(;B[db];W[cb])
(;B[cb];W[db])
(;B[ba];W[db])
(;B[bb];W[cb])
(;B[ab]C[Very funny])))
(;B[fe];W[ca]C[Let's test that theory]
(;B[cb];W[ba]
(;B[bb];W[ab]C[Well, partial credit for getting the ko at least.])
(;B[da];W[ab]C[Black can't push]))
(;B[bb];W[db];B[cb];W[fa])
(;B[db];W[bb]
(;B[cb];W[ba])
(;B[ba];W[ab]))
(;B[ab]C[Very funny])
(;B[ba];W[bb]
(;B[cb];W[ab];B[ba];W[db])
(;B[ab];W[cb]))
(;B[da];W[fa];B[db];W[bb])))