Problem	11953
Created	2008-11-09
Source	Book
Rating

Difficulty	13.3 kyu
Average Solve Time	31 secs
User Attempts	30 / 66
Solve Ratio Rating	8 kyu
	rating history

Interesting and useful problem I found in a book.

(;AB[rq]AB[pq]AB[pp]AB[np]AB[nq]AB[lq]AB[oo]AB[on]AB[pn]AW[op]AW[oq]AW[or]AW[no]AW[nn]AW[po]AW[qo]AW[om]AW[qm]C[Black to play the best move(s).]AP[goproblems] (;B[os];W[nr] (;B[mr];W[pr];B[qr];W[pm] (;B[ps]C[RIGHT]) (;B[ns]C[RIGHT])) (;B[pr];W[mr]C[Black is separated, the corner is not completely safe, and any hopeful black territory from the three stones on the side is basically ruined.])) (;B[pr];W[os] (;B[ps];W[qn] (;B[nr];W[pm]C[Black is separated and the corner is not completely safe.]) (;B[ns];W[pm]C[Black is separated and the corner is not completely safe.])) (;B[nr];W[pm] (;B[ps];W[qn]C[Black is separated and the corner is not completely safe.]) (;B[ns];W[qn]C[Black is separated and the corner is not completely safe.]))) (;B[nr];W[os] (;B[pr];W[pm] (;B[ps];W[qn]C[Black is separated and the corner is not completely safe.]) (;B[ns];W[qn]C[Black is separated and the corner is not completely safe.])) (;B[ns];W[pm] (;B[pr];W[qn]C[Black is separated and the corner is not completely safe.]) (;B[ps];W[qn]C[Black is separated and the corner is not completely safe.]))) (;B[ns];W[os]C[Black is separated and the corner is not completely safe.]) (;B[ps];W[os]C[Black is separated and the corner is not completely safe.]) (;B[pm]C[NOTTHIS]) (;B[qn]C[NOTTHIS]))