(;AW[ad]AW[bd]AW[cd]AW[dd]AW[eb]AB[ae]AB[be]AB[ce]AB[de]AB[ee]AB[fe]AB[fd]AB[fc]AB[fb]AB[fa]AW[db]AW[cb]AW[bb]AW[ab]C[Black can't kill White but has the best result.]AP[goproblems]
(;B[da];W[ea];B[ec];W[dc])
(;B[ea]
(;W[da]
(;B[dc];W[ec])
(;B[ec];W[dc]C[RIGHT])
(;B[ed];W[ec]))
(;W[ec]
(;B[ca];W[da])
(;B[da];W[ca]C[RIGHT])))
(;B[dc];W[ec];B[ea];W[da])
(;B[ec]
(;W[dc]
(;B[da];W[ea])
(;B[ea];W[da]C[RIGHT]))
(;W[ea]
(;B[cc];W[dc])
(;B[dc];W[cc]C[RIGHT])))
(;B[ed]
(;W[ec];B[ea];W[da])
(;W[ea];B[ec];W[dc])))