(;AB[bb]AB[db]AB[cb]AB[da]AW[bd]AW[cd]AW[cc]AW[dc]AW[ec]AW[eb]AW[ea]AW[de]AB[dd]AW[ee]AB[be]AB[ce]AB[df]AB[cf]AW[af]AW[ag]AW[ah]AB[bh]AB[bi]AB[bj]AB[aj]AW[bc]AB[ac]AB[cg]AB[ch]AW[ak]AW[bk]AW[cl]AW[cj]AW[ef]AW[eh]AW[dg]AB[dh]AW[fg]AW[ei]AW[di]AW[fj]AW[gd]AB[el]AB[ek]AB[dl]AB[fk]AB[gk]AB[cm]AB[bm]AB[am]AW[ck]AB[dm]AB[gj]AW[gi]AW[gh]C[Play the best endgame for black. The rest of the board is settled.]AB[dk]AP[goproblems]
(;B[ab];W[ae]
(;B[ad];W[ba]C[Black loses everything :(])
(;B[ba];W[ad]C[:(]))
(;B[ej];W[ae]C[:(])
(;B[eg];W[ae]C[:(])
(;B[ad];W[ae];B[ab];W[ba]C[:(])
(;B[ba];W[ae]
(;B[ab];W[ad]C[:(])
(;B[ad];W[ab]C[:(]))
(;B[ed];W[ae])
(;B[fd];W[ae])
(;B[bg];W[ae])
(;B[bf];W[ae])
(;B[ai];W[ae])
(;B[ae];W[ad]
(;B[ab];W[bg]C[:(])
(;B[bg];W[ej]
(;B[ab];W[ba]C[You got rid of a good ko threat])
(;B[ba];W[ab]C[You got rid of a good ko threat])
(;B[bf]C[:O])
(;B[ai]C[:O])
(;B[ci]C[];W[dj]C[You got rid of a good ko threat])
(;B[ed];W[eg])
(;B[fd];W[eg])
(;B[eg]C[Ko fight for the final point. :) You have ko threats at A18 (or B19) and C11 (or D10).RIGHT]TR[ab]TR[ci])
(;B[dj]C[You got rid of a good ko threat]))
(;B[ba];W[bg]C[:(])
(;B[ej];W[bg])
(;B[eg];W[bg])
(;B[ed];W[bg])
(;B[fd];W[bg])
(;B[bf];W[bg])
(;B[ai];W[bg])))
