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tesuji
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Problem | 16283 |
Created | 2012-07-21 |
Source | Basic Techniques of Go by Haruyama 8 dan and Nagahara 6 dan |
Rating | |
Difficulty | 11.5 kyu |
Average Solve Time | 62 secs |
User Attempts |
1179 / 3277 |
Solve Ratio Rating | 5 kyu |
| rating history |
(;AB[bc]AB[cd]AB[ce]AB[dd]AB[ed]AB[df]AB[dg]AB[dh]AB[ci]AB[dj]AB[bj]AB[bk]AB[bf]AW[be]AW[bd]AW[cc]AW[bb]AW[de]AW[cf]AW[ch]AW[cg]AW[bh]AW[bi]TR[cf]TR[cg]TR[ch]TR[bh]TR[bi]C[Black has a tesuji on the side to capture the marked stones. Can you find it? (has been edited slightly to avoid complex variations)]AW[cb]AP[goproblems]
(;B[ag];W[bg]
(;B[af];W[ac]
(;B[ai];W[ae];B[ah]C[Correct! The kosumi tesuji!RIGHT])
(;B[ah];W[ae];B[ai]C[Correct! The kosumi tesuji!RIGHT])
(;B[ae];W[ad]
(;B[ai];W[ah])
(;B[ah];W[ai]))
(;B[ad];W[ae]
(;B[ai];W[ah])
(;B[ah];W[ai])))
(;B[ae];W[af]C[Ko. Black can do better.])
(;B[ah];W[af]
(;B[ai];W[aj])
(;B[aj];W[ai]))
(;B[ai];W[af]
(;B[ah];W[aj])
(;B[aj];W[ah]))
(;B[ad];W[af]))
(;B[ai];W[af]
(;B[ah];W[bg]
(;B[aj];W[ag])
(;B[ag];W[aj])
(;B[ac];W[ag];B[aj]))
(;B[bg];W[ag])
(;B[ag];W[bg]
(;B[ah])
(;B[aj];W[ah]))
(;B[ad];W[ac]
(;B[ah];W[bg]
(;B[aj];W[ag])
(;B[ag];W[aj]))
(;B[ag];W[bg]
(;B[ah];W[aj])
(;B[aj];W[ah])))
(;B[aj];W[ah]))
(;B[ae];W[ac]
(;B[ag];W[bg]
(;B[ai];W[af]C[Ko. Black can capture unconditioonally.])
(;B[ah];W[af]C[Ko. Black can capture unconditionally.])
(;B[af];W[ad]
(;B[ai];W[ah])
(;B[ah];W[ai]))
(;B[ad];W[af]))
(;B[bg];W[ag]
(;B[af];W[ad])
(;B[ad];W[af])
(;B[ai];W[af])
(;B[ah];W[ai];B[aj];W[af]))
(;B[ai];W[bg]
(;B[ag];W[af]C[Ko. Black can capture unconditioonally.])
(;B[ah];W[af]
(;B[aj];W[bf])
(;B[ag];W[aj]))
(;B[af];W[ad]
(;B[ah];W[ag])
(;B[ag];W[ah]))
(;B[ad];W[af]))
(;B[ah];W[bg]
(;B[ag];W[af]C[Ko. Black can capture unconditionally.])
(;B[ai];W[af]
(;B[aj];W[bf])
(;B[ag];W[aj]))
(;B[af];W[ad]
(;B[ai];W[ag])
(;B[ag];W[ai])))
(;B[af];W[ag]
(;B[ai];W[ad])
(;B[ah];W[ai]
(;B[aj]C[Black can't push at b13])
(;B[bg];W[ad])
(;B[ad];W[bg]))
(;B[bg];W[ad])
(;B[ad];W[bg]))
(;B[ad];W[af]))
(;B[bg];W[ag]
(;B[ai];W[af])
(;B[ah];W[ai]
(;B[aj];W[af])
(;B[af];W[ae])
(;B[ae];W[af])
(;B[ad];W[ac];B[aj];W[af])
(;B[ac];W[cb]
(;B[ae];W[af])
(;B[ad];W[af])
(;B[aj];W[af])))
(;B[af];W[ae])
(;B[ad];W[ac]
(;B[ai];W[af])
(;B[ah];W[af]))
(;B[ae];W[ac]
(;B[af];W[ad])
(;B[ad];W[af])
(;B[ai];W[af])
(;B[ah];W[ai];B[aj];W[af]))
(;B[ac];W[ab]
(;B[ae];W[ad])
(;B[ad];W[ae])
(;B[af];W[ae])))
(;B[af];W[ag]
(;B[ae];W[ac]
(;B[ai];W[ad])
(;B[ah];W[ai]
(;B[aj]C[Black can't push at b13])
(;B[bg];W[ad])
(;B[ad];W[bg]))
(;B[bg])
(;B[ad];W[bg]))
(;B[ad];W[ac];B[ae];W[bg])
(;B[bg];W[ae])
(;B[ai];W[ac]
(;B[ah];W[aj])
(;B[aj];W[ae];B[ah];W[bg])
(;B[bg];W[ae])
(;B[ae];W[ad]))
(;B[ah];W[ai])
(;B[ac];W[bg]
(;B[ai];W[ae])
(;B[ah];W[ai]
(;B[aj];W[ae])
(;B[ae];W[ad])
(;B[ad];W[ae]))
(;B[ae];W[ad])
(;B[ad];W[ae])
(;B[ab];W[cb]
(;B[ae];W[ad])
(;B[ad];W[ae])
(;B[ai];W[ae])
(;B[ah];W[ai];B[aj];W[ae]))))
(;B[ad];W[ac]
(;B[ag];W[bg]
(;B[ai];W[af]
(;B[ah])
(;B[aj];W[ah]))
(;B[ah];W[af]
(;B[aj];W[ai])
(;B[ai];W[aj]))
(;B[af];W[ae]
(;B[ai];W[ah])
(;B[ah];W[ai]))
(;B[ae];W[af])
(;B[aj];W[af]
(;B[ah];W[ai])
(;B[ai];W[ah])))
(;B[ae];W[af])
(;B[af];W[ag];B[ae])
(;B[bg];W[ag]
(;B[ai];W[af])
(;B[ah];W[af]))
(;B[ai]
(;W[ag];B[aj];W[af];B[ah];W[bg])
(;W[bg];B[ah];W[af]
(;B[aj];W[ag])
(;B[ag];W[aj])))
(;B[ah];W[ag]
(;B[aj];W[ai])
(;B[ai];W[aj])
(;B[af];W[ai]
(;B[aj];W[ae])
(;B[bg];W[ae])
(;B[ae];W[bg]))
(;B[bg];W[af])))
(;B[ah];W[af]
(;B[ac];W[ab]
(;B[ai];W[bg]
(;B[aj];W[ag])
(;B[ag];W[aj])
(;B[ad];W[ae]))
(;B[ad];W[ae])
(;B[ae];W[ad])
(;B[bg];W[ag])
(;B[ag];W[bg]
(;B[ai];W[aj])
(;B[aj];W[ai])
(;B[ad];W[ae])
(;B[ae];W[ad]))
(;B[aj];W[bg]
(;B[ai];W[ag])
(;B[ag];W[ai])
(;B[ad];W[ai])
(;B[ae];W[ai])))
(;B[ag];W[bg]
(;B[ai];W[aj])
(;B[aj];W[ai]))
(;B[bg];W[ag])
(;B[ai];W[bg]
(;B[aj];W[ag])
(;B[ag])
(;B[ac];W[ag];B[aj]))
(;B[ae];W[bg]
(;B[ag];W[ai])
(;B[aj];W[ai])
(;B[ai];W[ad];B[aj];W[ag]))
(;B[ad];W[ac]
(;B[ai];W[bg]
(;B[aj];W[ag])
(;B[ag];W[aj]))
(;B[bg];W[ag])
(;B[ag];W[bg]
(;B[ai];W[aj])
(;B[aj];W[ai]))
(;B[aj];W[bg];B[ai];W[ag]))
(;B[aj];W[bg]
(;B[ai];W[ag])
(;B[ag];W[ai])))
(;B[ac];W[af]
(;B[cb]
(;W[ab];B[dc])
(;W[bg];B[dc];W[ad]))
(;B[bg];W[ag])
(;B[ai];W[bg];B[ah];W[ag];B[aj])
(;B[ah];W[ab]
(;B[ai];W[bg]
(;B[aj];W[ag])
(;B[ag];W[aj])
(;B[ad];W[ae]))
(;B[ad];W[ae])
(;B[ae];W[ad])
(;B[bg];W[ag])
(;B[ag];W[bg]
(;B[ai])
(;B[aj];W[ai])
(;B[ad];W[ae])
(;B[ae];W[ad]))
(;B[aj];W[bg]
(;B[ai])
(;B[ag])
(;B[ad];W[ai])
(;B[ae];W[ai])))
(;B[ae];W[bg]
(;B[ad];W[ab])
(;B[ab];W[ad]))
(;B[ag];W[bg])))
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