(;AB[bb]AB[cb]AB[cc]AB[dd]AB[de]AB[df]AB[ef]AB[fc]AB[fg]AB[gg]AB[hg]AW[ff]AW[eg]AW[dg]AW[fh]AW[gh]AW[cf]AW[ce]AW[cd]AW[ch]AW[bc]AW[bd]AW[ab]C[Please play the biggest endgame move.]AB[hh]AB[ic]AP[goproblems] (;W[ba] (;B[dc]C[Good job! Because of F14, black cannot block at C19.RIGHT]) (;B[ca]C[Black makes a mistake. How does white continue?];W[dc] (;B[db];W[ec]C[Good job! Black cannot defend both sides. RIGHT]) (;B[ec];W[db];B[aa] (;W[da];B[ac];W[ed]C[RIGHT]) (;W[ed];B[da]C[Not as large as it could be.])))) (;W[aa];B[ba];W[dc];B[db];W[ec];B[ed];W[eb];B[fb];W[ea];B[fa]) (;W[ac];B[ba];W[dc];B[ec]) (;W[dc];B[ec] (;W[db];B[eb];W[ba];B[da]C[Good job! RIGHT]) (;W[ba];B[db]C[RIGHT])))