(;AB[ac]AB[db]AB[dc]AB[dd]AB[ce]AB[be]AW[ab]AW[cb]AW[cc]AW[cd]AW[bd]AB[df]AB[bg]AB[fb]AP[goproblems]
(;W[ba];B[ad]TR[aa]C[Creating an eye in the corner is useful in many positions.];W[bc]C[RIGHT])
(;W[bc];B[ba]
(;W[ca];B[ad];W[ae];B[ad])
(;W[ad];B[ca]))
(;W[ad]
(;B[ba]
(;W[ca];B[bb]LB[fg:T]C[Play at T if you wish to tenuki.]
(;W[bc]C[wB17 works but it is usually better is to tenuki.RIGHT])
(;W[fg]C[RIGHT];B[aa];W[bc]C[RIGHT]))
(;W[bb];B[ca])
(;W[aa];B[ca])
(;W[bc];B[ca])
(;W[da];B[ca]))
(;B[bb]
(;W[bc]C[RIGHT])
(;W[ba];B[aa];W[bc];B[ca];W[ab]C[Ko];B[ac]C[NOTTHIS])
(;W[aa];B[ba];W[ca];B[da];W[ab];B[aa];W[bc];B[ae]))
(;B[ca];W[ba]C[RIGHT]))
(;W[ae]
(;B[ca]
(;W[ba]C[White gets a 2nd eye in the corner.RIGHT]TR[aa]TR[bc])
(;W[bc];B[ba])
(;W[da];B[ba])
(;W[eb];B[ba]))
(;B[ba]
(;W[ca];B[ad];W[bc];B[ad])
(;W[ad];B[ca])))
(;W[af]C[This can work but isn't the best.];B[ba];W[ca];B[ad];W[ae];B[bb];W[bc];B[ad])
(;W[aa];B[ad];W[bc];B[ae])
(;W[bb];B[ad])
(;W[ca];B[ad];W[bc];B[ba];W[ae];B[ad])
(;W[da];B[ad];W[bc];B[ba]C[Pyramid four nakade.]TR[aa]TR[ba]TR[ca]TR[bb]
(;W[ae];B[ad])
(;W[ea];B[fa];W[eb];B[ec])
(;W[eb];B[ec];W[ea]LB[ee:T];B[ee]C[Black tenukis.]))
(;W[bf];B[ad];W[bc];B[ba]
(;W[ca];B[ae])
(;W[ae];B[ca]))
(;W[ea];B[ba]
(;W[ca];B[ad])
(;W[ad];B[ca];W[da];B[fa];W[bb];B[eb]))
(;W[eb];B[ba];W[ca];B[ad]))