This really misses the point of problem 16171, but is still something I thought would be cool to show.
(;AW[bc]AW[cd]AW[ce]AW[ad]AW[cb]AB[cc]AB[dc]AW[db]AB[eb]AB[ec]AB[dd]AB[de]AB[cf]AB[df]AW[bf]AW[bg]AW[ch]AW[ea]C[Assume the rest of the board is settled. Best local endgame move?FORCE]AB[gb]AP[goproblems]
(;B[be];W[bd]
(;B[bb];W[ba]
(;B[ab]
(;W[ae]
(;B[ca];W[da];B[fa]C[RIGHT])
(;B[fa];W[ac])
(;B[da];W[ca];B[fa];W[ac]))
(;W[ca]C[CHOICE];B[fa];W[ae];B[da]C[RIGHT];W[ac];B[aa];W[cb]C[RIGHT]))
(;B[fa];W[ab]C[You could do better.]))
(;B[fa];W[ba]C[You could do better.])
(;B[da];W[ba]C[You could do better.]))
(;B[bb];W[ba]
(;B[be];W[bd]
(;B[ab]
(;W[ae]
(;B[ca];W[da];B[fa]C[RIGHT])
(;B[fa];W[ac])
(;B[da];W[ca];B[fa];W[ac]))
(;W[ca]C[CHOICE];B[fa];W[ae];B[da]C[RIGHT];W[ac];B[aa];W[cb]C[RIGHT]))
(;B[fa];W[ab]C[You could do better.]))
(;B[ab];W[ac]
(;B[be]C[RIGHT])
(;B[ae];W[aa])
(;B[da];W[aa]C[You could do better.])
(;B[fa];W[aa]C[You could do better.]))
(;B[fa];W[ab]C[You could do better.]))
(;B[fa];W[ba]C[You could do better.])
(;B[da];W[ba]C[You could do better.])
(;B[ca];W[ba])
(;B[bd];W[be])
(;B[ab];W[bb])
(;B[ba];W[bb])
(;B[ae];W[bb])
(;B[fb];W[bb])
(;B[ac];W[ab])
(;B[aa];W[bb]))