invalid problem set
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Problem | 1805 |
Created | 2002-12-16 |
Source | amateur game |
Rating | |
Difficulty | 2.1 dan |
Average Solve Time | 41 secs |
User Attempts |
584 / 3405 |
Solve Ratio Rating | 1 dan |
| rating history |
This is a position from a game I observed today. Please forget about the outside - what is blacks best endgame in the corner?
(;GM[1]FF[4]CA[UTF-8]AP[CGoban:2]ST[2]
RU[Japanese]SZ[19]KM[0.50]TM[]
AW[qn][so][rp][sp][lq][mq][qq][nr][rr]AB[rn][sn][qo][ro][np][pp][qp]C[Black to move!]
(;B[pr]CR[pr]
(;W[pq]CR[pq]
(;B[oq]CR[oq]
;W[or]CR[or]
(;B[rq]CR[rq]
;W[qr]CR[qr]
(;B[sr]CR[sr]C[RIGHT CHOICE])
(;B[sq]LB[sr:A]CR[sq]C[A is better!]))
(;B[qr]CR[qr]
;W[rq]CR[rq]
;B[rs]CR[rs]
;W[ps]CR[ps]C[Black is a liberty short]))
(;B[sr]CR[sr]
;W[rq]CR[rq]
;B[oq]CR[oq]
;W[or]CR[or]
;B[qr]CR[qr]
;W[ps]CR[ps]))
(;W[qr]CR[qr]
;B[sr]CR[sr]
;W[pq]CR[pq]
;B[oq]CR[oq]
;W[or]CR[or]
;B[rq]CR[rq]C[RIGHT CHOICE]))
(;B[pq]CR[pq]
;W[pr]CR[pr])
(;B[oq]CR[oq]
;W[pr]CR[pr]
;B[or]CR[or]
;W[os]CR[os]C[This is not good enough])
(;B[rq]CR[rq]
;W[sq]CR[sq]
;B[pr]CR[pr]
;W[qr]CR[qr]
;B[or]CR[or]C[This is not as good as the solution])
(;B[sr]CR[sr]
;W[rq]CR[rq]
;B[pr]CR[pr]
;W[pq]CR[pq]
;B[oq]CR[oq]
;W[or]CR[or]
;B[qr]CR[qr]
;W[ps]CR[ps])
(;B[or]CR[or]
;W[oq]CR[oq]
;B[pr]CR[pr]
;W[pq]CR[pq]
;B[nq]CR[nq]
;W[mr]CR[mr]
(;B[qr]CR[qr]
;W[rq]CR[rq]
;B[rs]CR[rs]
;W[os]CR[os])
(;B[rq]CR[rq]
;W[sq]CR[sq]
;B[qr]CR[qr]
;W[qs]CR[qs])))
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