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life and death
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Problem | 4086 |
Created | 2004-03-18 |
Source | Japanes book |
Rating | |
Difficulty | 3.2 dan |
Average Solve Time | 80 secs |
User Attempts |
246 / 2038 |
Solve Ratio Rating | 2 dan |
| rating history |
Black to play. This is not so hard if you take all the possibilities into account. Thanks to tails for finding another solution.
(;AW[cm]AW[bn]AW[cn]AW[bo]AW[ap]AW[cp]AW[cq]AW[dq]AW[eq]AW[fq]AW[gq]AW[cr]AB[bj]AB[ck]AB[bl]AB[dl]AB[dm]AB[dn]AB[co]AB[do]AB[fo]AB[bp]AB[gp]AB[ip]AB[bq]AB[hq]AB[br]AB[er]AB[fr]AB[gr]C[Black to play.]
(;B[ar];W[bs]
(;B[an]C[RIGHT])
(;B[aq];W[as]
(;B[bq];W[an])
(;B[an];W[bq]))
(;B[am]
(;W[cs]
(;B[aq];W[an]C[White lives.])
(;B[an];W[ao]
(;B[aq]C[RIGHT])
(;B[cl];W[as])
(;B[bm];W[as])))
(;W[ao];B[aq]C[RIGHT]))
(;B[bm];W[cs]
(;B[aq];W[an]C[White lives])
(;B[an];W[as];B[am];W[ao]C[White lives.])))
(;B[cs];W[bs]
(;B[ds];W[ar]C[ko])
(;B[as];W[ds];B[dr];W[bs]))
(;B[an];W[ar]C[White lives.])
(;B[dr];W[bs];B[ar];W[an]C[White lives.])
(;B[bm];W[ar]C[White lives.])
(;B[ao];W[ar]
(;B[aq];W[bs]C[Ko])
(;B[bs];W[cs];B[aq];W[an]C[Ko])
(;B[cs];W[ds];B[bs];W[dr];B[aq];W[an]C[Ko])))
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