invalid problem set
Problem | 5788 |
Created | 2005-01-09 |
Source | head |
Rating | |
Difficulty | 7 dan |
Average Solve Time | 52 secs |
User Attempts |
143 / 1578 |
Solve Ratio Rating | 3 dan |
| rating history |
(;AB[ea]AB[eb]AB[ec]AB[ed]AB[de]AB[ce]AB[be]AB[ae]AB[ca]AW[bb]AW[bd]AW[dc]AW[db]AW[da]AW[dd]C[What's the best black can do?]AP[goproblems]
(;B[ad];W[bc]
(;B[ac];W[ab]
(;B[ba];W[cd];B[cb]C[seki])
(;B[cb];W[ba])
(;B[cd];W[ba]))
(;B[cd];W[ba])
(;B[ba];W[cd]
(;B[ac];W[ab];B[cb]C[seki])
(;B[aa];W[ab]
(;B[cb]C[seki])
(;B[ac];W[cb]))
(;B[cb];W[ab]C[seki])
(;B[ab];W[ac]
(;B[aa];W[cb])
(;B[cb];W[aa]C[ko, white takes first])))
(;B[cb];W[ba])
(;B[ab];W[ac]))
(;B[ac];W[ad]
(;B[bc];W[ab]
(;B[cd];W[ba])
(;B[cc];W[cb]
(;B[ba];W[cd])
(;B[cd];W[ba])))
(;B[cc];W[ab]
(;B[cb];W[bc]
(;B[ba];W[cd])
(;B[cd];W[ba]))
(;B[cd];W[cb]
(;B[bc];W[ba])
(;B[ba];W[bc]))
(;B[bc];W[cb]
(;B[cd];W[ba])
(;B[ba];W[cd]))
(;B[ba];W[bc]))
(;B[cd];W[ab]
(;B[bc];W[ba])
(;B[cc];W[bc]
(;B[cb];W[ba])
(;B[ba];W[cb]))
(;B[cb];W[bc]
(;B[cc];W[ba])
(;B[ba];W[cc])))
(;B[cb];W[ab]
(;B[cc];W[bc]
(;B[cd];W[ba])
(;B[ba];W[cd]))
(;B[bc];W[cc])
(;B[cd];W[bc]
(;B[cc];W[ba])
(;B[ba];W[cc])))
(;B[ab];W[bc]
(;B[cd];W[cb])
(;B[cb];W[cd];B[ba];W[aa];B[ab]C[seki])
(;B[ba];W[cd]
(;B[cb];W[aa];B[ab]C[seki])
(;B[aa];W[cb]C[symmetric, but not good for black.])))
(;B[ba];W[bc]
(;B[cb];W[ab])
(;B[cd];W[ab])
(;B[ab];W[cd]
(;B[cb];W[aa];B[ab]C[seki])
(;B[aa];W[cb]))))
(;B[cd];W[ba]
(;B[bc];W[ab])
(;B[cc];W[cb]
(;B[bc];W[ab])
(;B[ac];W[bc]
(;B[ad];W[ab])
(;B[ab];W[ad]))
(;B[ad];W[bc];B[ac];W[ab])
(;B[ab];W[bc]))
(;B[ad];W[bc])
(;B[ac];W[bc])
(;B[cb];W[cc])
(;B[ab];W[bc]))
(;B[bc];W[cc]
(;B[ac];W[ab]
(;B[ad];W[ba])
(;B[ba];W[ad]))
(;B[ab];W[ac])
(;B[ba];W[ac]
(;B[ad];W[cd];B[ab];W[aa]C[not a good ko for black.])
(;B[cd];W[ad];B[ab];W[aa]C[not a good ko for black.])
(;B[aa];W[ad])
(;B[ab];W[cb]))
(;B[cd];W[ac]
(;B[ad];W[ba];B[bc]C[ko, black takes first.RIGHT])
(;B[ba];W[ad];B[ab];W[aa]C[not a good ko for black.]))
(;B[ad];W[ac]
(;B[cd];W[ba];B[bc]C[ko, black takes first.RIGHT])
(;B[ba];W[cd];B[ab];W[aa]C[not a good ko for black.])))
(;B[cc];W[cd]
(;B[ad];W[bc]
(;B[cb];W[ba])
(;B[ac];W[cb])
(;B[ab];W[ba])
(;B[ba];W[cb]))
(;B[ac];W[bc]
(;B[cb];W[ba])
(;B[ab];W[ba])
(;B[ba];W[ab]
(;B[ad];W[cb])
(;B[cb];W[ad]))
(;B[ad];W[ba]))
(;B[bc];W[cb])
(;B[cb];W[bc])
(;B[ab];W[ad]
(;B[ac];W[bc])
(;B[bc];W[cb])
(;B[cb];W[ba])))
(;B[cb];W[bc])
(;B[ba];W[cd]
(;B[ad];W[bc]
(;B[cb];W[ab]C[seki])
(;B[ab];W[ac];B[cb];W[aa]C[ko, white takes first])
(;B[ac];W[ab];B[cb]C[seki]))
(;B[ac];W[ad]
(;B[bc];W[cb];B[ab];W[aa];B[ba]C[seki])
(;B[cb];W[bc];B[ab];W[aa];B[ab]C[seki])
(;B[ab];W[bc]
(;B[aa];W[cb])
(;B[cb];W[aa];B[ab]C[seki]))
(;B[cc];W[cb];B[ab];W[aa];B[ba];W[bc]))
(;B[bc];W[ac]
(;B[ad];W[cc];B[ab];W[aa]C[bad ko])
(;B[ab];W[cc];B[ad];W[aa]C[bad ko]))
(;B[ab];W[ad])
(;B[cb];W[bc]))
(;B[ab];W[bc]))
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