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life and death
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Problem | 13864 |
Created | 2010-07-28 |
Name | Comb patterns, Pattern 18 |
Source | All about life and death, Cho Chikun |
Rating | |
Difficulty | 2.6 dan |
Average Solve Time | 65 secs |
User Attempts |
482 / 1269 |
Solve Ratio Rating | 6 kyu |
| rating history |
White to play and make ko
(;AB[sr]AB[rr]AB[qq]AB[pq]AB[or]AW[nr]AW[nq]AW[lr]AW[op]AW[pp]AW[qp]AW[ro]AW[rq]AW[sq]AP[goproblems]
(;W[qs];B[qr]
(;W[os];B[ps];W[pr]C[RIGHT]))
(;W[os];B[ps]
(;W[qs];B[qr];W[pr]C[RIGHT])
(;W[oq]
(;B[ns]))
(;W[pr];B[ns])
(;W[qr];B[qs])
(;W[rs];B[qs]
(;W[pr];B[ns])
(;W[qr];B[pr])))
(;W[ps];B[os];W[rs];B[qr];W[qs];B[oq]C[Seki])
(;W[rs];B[qr]
(;W[ps];B[os];W[qs];B[oq])
(;W[os];B[ps];W[oq];B[ns])))
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