(;AP[goproblems]AB[ab]AB[bb]AB[db]AB[cb]AW[aa]AW[ca]AW[bc]AW[cc]AW[dc]AW[ec]AW[eb](;B[da]MA[ba]C[White cannot play at B19 so Black has 2 eyes.RIGHT])(;B[ea];W[da](;B[ba];W[da]C[Just one eye.])(;B[fa];W[gb]MA[da]C[Black cannot escape. If Black captures White throws in at D1 and Black has just one eye.];B[ba];W[da])(;B[ac];W[be](;B[ba];W[da])(;B[fa];W[gb];B[ba];W[da])))(;B[ba];W[da];B[ea];W[da]C[Just one eye.])(;B[ac];W[da]))