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7 dan
This problem isn't cool, i just found it VERY complex, cos every bad first move as black is little L&D problem for white to live (I dont suppose, that i made all answers correct, so comments are invited)
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Author
marwin
Created
2005-02-07
Difficulty
7 dan (
history
)
Source
N/A
AVG solve time
38 sec
Stars
2.5 (
4 votes
)
User attempts
97 / 1750
Collections
N/A
Genre
life and death
ⓒ
Your attempts
N/A
Similar problems
Created
2005-02-07
Source
N/A
Stars
2.5 (
4 votes
)
Collections
N/A
Your attempts
N/A
Problem flags
Problem stars
(;C[Black to play and kill]AW[rp]AW[qp]AW[pp]AW[op]AW[or]AB[nr]AB[np]AB[nq]AB[no]AB[mm]AB[ol]AB[pl]AB[ql]AB[rm]AB[ro]AB[qo]AB[kq]AW[on]AW[pn]AP[goproblems] (;B[sr] (;W[rq]C[];B[pr];W[qr];B[pq]C[RIGHT]) (;W[sq]C[CHOICE] (;B[rq];W[sp] (;B[oq] (;W[rr];B[qq];W[pq];B[qr]C[RIGHT];W[qs];B[rs]C[RIGHT]) (;W[qr];B[pq];W[qq];B[rr];W[pr];B[os]C[RIGHT])) (;B[qr];W[oq] (;B[rs];W[qq];B[pr];W[ps];B[rr];W[pq];B[po];W[oo];B[ns];W[os];B[so];W[qs];B[nn];W[ss];B[rr];W[qr]) (;B[qq];W[rs];B[rr];W[os];B[po];W[oo];B[ns];W[qs];B[pr];W[ps];B[so];W[pq]) (;B[os];W[qq] (;B[rr];W[ps] (;B[pr];W[ns]) (;B[qs];W[pr])) (;B[pr];W[rr];B[rs];W[ss];B[qs];W[pq]LB[sr:Ko?];B[ps];W[ns]) (;B[ps];W[rr] (;B[rs];W[pr]LB[rq:Ko?] (;B[qs];W[ss];B[ns];W[sr]) (;B[rq])) (;B[pr];W[rs])) (;B[qs];W[pr];B[ps];W[rr];B[rs];W[ss];B[ns];W[sr]) (;B[rs];W[pr];B[ps];W[rr];B[qs];W[ss];B[ns];W[sr]))) (;B[pr];W[rr];B[qq];W[qr] (;B[pq];W[oq];B[ps];W[os]) (;B[ps];W[pq];B[rs];W[qs])) (;B[pq];W[oq] (;B[qr];W[qq] (;B[rr];W[pr]) (;B[pr];W[rr] (;B[os];W[qs]) (;B[rs];W[ps];B[rq];W[os];B[qs];W[rr]))) (;B[qq];W[rr];B[qr];W[ss] (;B[os];W[qs]) (;B[pr];W[qs])))) (;B[rr];W[oq] (;B[rq];W[sp];B[qr];W[pr];B[qq];W[os];B[rs];W[qs];B[ps];W[pq];B[qs];W[ss];B[rr];W[qr];B[qs];W[rs];B[sr];W[rs];B[ss];W[rq]) (;B[pr];W[os];B[qs];W[qq];B[qr];W[rq];B[po];W[oo];B[pq];W[ps]))) (;W[qr]C[];B[sp];W[rq] (;B[sq];W[pq];B[ps];W[os] (;B[qs];W[rr];B[rs];W[pr] (;B[so];W[ss];B[rs];W[qs]) (;B[ss];W[so])) (;B[rr];W[qs])) (;B[pq] (;W[sq] (;B[pr]C[RIGHT]) (;B[oq];W[pr];B[os];W[ps];B[rs]C[RIGHT]) (;B[os];W[oq];B[pr];W[qs];B[ps]C[RIGHT]) (;B[ps];W[oq];B[os];W[pr])) (;W[oq];B[sq]C[RIGHT]))) (;W[sp];B[oq];W[pq];B[qr];W[pr] (;B[rs];W[os] (;B[rq];W[qs]) (;B[qs];W[rq];B[rr]C[RIGHT])) (;B[os];W[rs]))) (;B[oq];W[pq] (;B[qr];W[pr];B[sr];W[rq];B[rr];W[rs]) (;B[pr];W[qr];B[os];W[rq]) (;B[rq];W[rr] (;B[sp];W[sr] (;B[sq];W[qq];B[so];W[ps]) (;B[qq];W[qr];B[os];W[pr])) (;B[pr];W[qr];B[os];W[sq])) (;B[os];W[pr];B[rr];W[sr];B[qr];W[ps];B[sp];W[sq] (;B[rs];W[so]) (;B[so];W[rq] (;B[rs];W[qs]) (;B[qs];W[rs])))) (;B[pr];W[qr] (;B[oq];W[pq];B[os];W[rq]) (;B[pq];W[oq];B[os];W[qq] (;B[ps];W[qs];B[ns];W[sr] (;B[sp];W[sq];B[rr];W[rs]) (;B[rs];W[rr];B[sp];W[sq])) (;B[qs];W[rs];B[ps];W[ns])) (;B[rq];W[rr] (;B[oq];W[sq]) (;B[sp];W[sr];B[sq];W[qq];B[so];W[pq]) (;B[pq];W[qq];B[sq];W[oq];B[sp];W[sr];B[so])) (;B[os];W[pq] (;B[oq];W[rq]) (;B[qs];W[rs] (;B[oq];W[rq]) (;B[rr];W[ps]))) (;B[rr];W[pq] (;B[ps];W[os] (;B[qs];W[rs]) (;B[rs];W[qs];B[sp];W[sq];B[rq];W[so])) (;B[qs];W[ps])) (;B[qs];W[pq] (;B[os];W[rs] (;B[oq];W[rq]) (;B[rr];W[ps])) (;B[ps];W[os];B[rr];W[rs]))) (;B[pq];W[oq];B[rq];W[sp];B[qq];W[pr];B[qr];W[qs] (;B[rr];W[os];B[rs];W[sq];B[ps];W[sr]) (;B[os];W[rr])) (;B[qr];W[pr] (;B[rq];W[sp];B[rs];W[sr];B[sq];W[qq];B[rr];W[ps];B[oq];W[pq]) (;B[sr];W[rq];B[rr];W[rs];B[sp];W[sq];B[oq];W[pq];B[os];W[ps];B[ns]) (;B[rr];W[oq] (;B[sr];W[sp];B[rs];W[ps];B[qq];W[rq];B[so];W[qs];B[po];W[oo];B[nn];W[pq];B[qn];W[sq]) (;B[qq];W[rs];B[qs];W[sq];B[os];W[ps];B[so];W[sr];B[ss];W[rq]) (;B[sp];W[sq];B[rq];W[so];B[sr];W[sp];B[qq];W[os] (;B[qs]) (;B[rs];W[qs];B[ps];W[pq])))) (;B[rr];W[qr] (;B[rq];W[sp];B[qq];W[pr];B[oq];W[pq] (;B[os];W[ps];B[rs];W[sq]) (;B[ps];W[os];B[qs];W[rs];B[qs];W[sr];B[ss];W[sq]) (;B[qs];W[ps];B[ss];W[sq];B[sr];W[rs])) (;B[oq];W[rq];B[sr];W[pq];B[os];W[pr])) (;B[rq];W[rr] (;B[qq];W[sq] (;B[oq];W[pq];B[pr];W[qr];B[os]) (;B[pq];W[oq]) (;B[pr];W[qr];B[pq];W[oq] (;B[os];W[ps]) (;B[ps];W[os]))) (;B[sq];W[sp];B[qr];W[qq];B[pr];W[oq];B[os];W[ps];B[qs];W[rs];B[sr];W[ss] (;B[sq];W[pq]) (;B[ps];W[sq])) (;B[qr];W[qq];B[pr];W[rs];B[sq];W[sp];B[sr];W[ss];B[sq];W[oq];B[os];W[ps];B[qs];W[pq]) (;B[sr];W[qq] (;B[sq];W[sp]) (;B[sp];W[sq])) (;B[pr];W[oq] (;B[os];W[sq];B[qq];W[qr]) (;B[qq];W[sq];B[qr];W[ps];B[rs];W[sr];B[qs];W[os]))) (;B[qq];W[rr];B[oq];W[pq];B[pr];W[qr];B[os];W[qs];B[sq];W[rq];B[sp];W[sr]) (;B[os];W[rr];B[pr];W[qr] (;B[sq];W[sp];B[pq];W[qq] (;B[qs];W[rs] (;B[sr];W[oq]) (;B[oq];W[sr])) (;B[ps];W[qs];B[sr];W[ss];B[rs];W[rq])) (;B[pq];W[qq];B[sq];W[sp] (;B[qs];W[rs] (;B[sr];W[oq]) (;B[oq];W[sr])) (;B[ps];W[qs];B[sr];W[ss];B[rs];W[rq]))) (;B[sq];W[sp] (;B[rr];W[qr];B[oq];W[rq] (;B[pq];W[sr]) (;B[sr];W[pq])) (;B[oq] (;W[pr];B[pq];W[qq];B[rr];W[qr] (;B[os];W[rq];B[ps];W[sr]) (;B[sr];W[os];B[qs];W[rs];B[ss];W[rq])) (;W[pq];B[qr];W[pr];B[rr];W[rq];B[sr];W[rs]))) (;B[ps];W[qr] (;B[sr];W[os];B[pr];W[pq];B[sp];W[rq];B[sq]) (;B[os];W[sr];B[rs];W[qs];B[rr];W[rq];B[sp];W[pr])) (;B[rs];W[qr] (;B[sp];W[rq];B[sq];W[sr];B[ps];W[os];B[oq];W[pr];B[pq];W[qs]) (;B[sr];W[sq];B[rq];W[sp];B[qq] (;W[rr];B[pq];W[oq]) (;W[pq];B[rr];W[qs])) (;B[oq];W[rr];B[sq];W[sp];B[sr];W[pq] (;B[rq];W[ps]) (;B[os];W[qs]))))