Problem	9548
Created	2006-12-06
Source	review and extra stone added
Rating

Difficulty	1.6 dan
Average Solve Time	54 secs
User Attempts	420 / 1444
Solve Ratio Rating	4 kyu
	rating history

how should white handle the upper left cornor?

(;AB[cb]AB[cc]AB[fc]AB[fd]AB[ic]AB[cj]AB[cm]AB[dm]AB[fm]AB[hm]AB[ho]AB[hp]AB[ip]AB[gq]AB[md]AB[nd]AB[od]AB[pd]AB[pc]AB[oq]AB[pp]AB[oo]AB[pn]AB[qe]AB[re]AB[rf]AB[qi]AB[qj]AB[qk]AB[qm]AB[rn]AB[ro]AB[qp]AW[dc]AW[ec]AW[dd]AW[df]AW[ch]AW[cn]AW[do]AW[fo]AW[dq]AW[io]AW[jo]AW[jp]AW[iq]AW[nq]AW[np]AW[ql]AW[pl]AW[pk]AW[oi]AW[pg]AW[pf]AW[qf]AW[rg]AW[rk]AW[rm]AW[sl]AW[oc]AW[nc]AW[mc]AW[lc]AW[da]AB[be]AW[ce]AB[cd]AW[eb]AP[goproblems] (;W[bf] (;B[ad] (;W[bb];B[ba] (;W[bc];B[ab] (;W[ca];B[bd];W[aa]C[Just ko.]) (;W[bd];B[ac]) (;W[af];B[bd])) (;W[ab];B[bc];W[af];B[ae];W[ca];B[ac]) (;W[ca];B[ab]C[only ko]) (;W[ac];B[bc]) (;W[af];B[ab])) (;W[ca] (;B[ba]C[CHOICE] (;W[bb];B[ab]C[only ko]) (;W[ab] (;B[bb] (;W[ac];B[af];W[ag];B[bc];W[ae]C[only ko]) (;W[af]C[];B[ac];W[bd]C[RIGHT])) (;B[bc];W[af]C[RIGHT])) (;W[bc];B[ab];W[bb]C[];B[bd];W[aa]C[Just ko.]) (;W[ac];B[bc];W[ab];B[af];W[ag];B[bb];W[ae]C[only ko])) (;B[bb]C[] (;W[ba]C[RIGHT]) (;W[af];B[ba] (;W[ae];B[bd]) (;W[bd];B[bc];W[ae];B[ab]C[Just ko]) (;W[ab];B[ac] (;W[bd]C[RIGHT]) (;W[ae];B[bd])) (;W[ac];B[ab]) (;W[bc];B[bd])))) (;W[ba];B[ca])) (;B[ae] (;W[ac];B[ab];W[bb];B[bc];W[aa];B[ca];W[af];B[ba]) (;W[ca];B[ba];W[ab] (;B[bb];W[ac]C[RIGHT]) (;B[ac];W[bc]C[RIGHT]) (;B[bc];W[ac]C[RIGHT]) (;B[ad];W[ac]C[RIGHT])))) (;W[ca];B[bg]))