Problem	12050
Created	2008-12-12
Source
Rating

Difficulty	8 dan
Average Solve Time	90 secs
User Attempts	11 / 135
Solve Ratio Rating	4 dan
	rating history

White to play.
Kill all black stones on the right side ! (marked stones)

All comments appreciated ;)

(;AB[rq]AB[qq]AB[sp]AB[so]AB[ro]AW[rn]AW[rm]AB[rl]AB[ql]AB[rj]AW[qo]AW[qp]AW[rp]AW[pq]AW[pr]AW[po]AW[oo]AB[pn]AW[ol]AW[pk]AW[qk]AB[pm]AW[nn]AW[qi]AW[pi]AW[og]AW[pf]AW[rf]AB[ri]AB[si]AW[rh]AW[sh]AB[qh]AB[qg]AB[rg]AB[qc]AB[oc]AB[ob]AB[nb]AW[nc]AW[mc]AW[od]AW[oe]AB[nd]AW[me]AB[mb]AB[lc]AB[kc]AW[md]TR[qg]TR[qh]TR[rg]TR[ri]TR[rj]TR[si]TR[rl]TR[ql]TR[pm]TR[pn]TR[so]TR[ro]TR[sp]TR[rq]TR[qq]C[Ko is not a solution]AP[goproblems] (;W[se];B[qn]C[T15 is nice ;)] (;W[sr] (;B[rr] (;W[sq];B[ss] (;W[sq] (;B[sg]C[CHOICE] (;W[rk];B[re] (;W[rd];B[qe] (;W[qf];B[sf] (;W[qd];B[sd] (;W[rc];B[rb] (;W[pc];B[sc];W[qb];B[ra];W[sb]C[Very Nice !RIGHT]) (;W[pd];B[sc]) (;W[sc];B[pd];W[se]C[ko]) (;W[qb];B[pc] (;W[sc];B[pd];W[se]C[ko]) (;W[pd];B[sc]) (;W[sb];B[pd];W[ra];B[pe])) (;W[pe];B[sc];W[se];B[re]) (;W[sb];B[pd])) (;W[sc];B[rc];W[se]C[ko])) (;W[sd];B[qd])) (;W[qd];B[qf])) (;W[qf];B[sf] (;W[rd];B[sd] (;W[qd];B[rc]) (;W[rc];B[qd]) (;W[qe];B[se] (;W[rc];B[qd]) (;W[qd];B[rc])) (;W[sc];B[se] (;W[qd];B[rc]) (;W[rc];B[qd]) (;W[qe];B[qd]))) (;W[sd];B[rd]) (;W[qd];B[rd];W[rc];B[rb])) (;W[qe];B[rd] (;W[sf];B[qf]) (;W[qf];B[sf])) (;W[qd];B[rd];W[rc];B[rb]) (;W[pe];B[rd] (;W[sf];B[qf]) (;W[qf];B[sf])) (;W[sd];B[qe];W[qf];B[sf])) (;W[sn];B[rk])) (;B[sr]C[NOTTHIS] (;W[sn];B[sq] (;W[qr] (;B[sg] (;W[rk];B[re] (;W[rd];B[qe] (;W[qf];B[sf] (;W[qd];B[sd] (;W[rc];B[rb] (;W[pc];B[sc];W[qb];B[ra] (;W[sb]C[Very nice !RIGHT]) (;W[qa];B[sb]C[arg !])) (;W[sc];B[pd];W[se]C[only ko]) (;W[pd];B[sc]) (;W[pe];B[sc];W[se];B[re]) (;W[qb];B[pc] (;W[sb];B[pd];W[ra];B[pe]) (;W[pe];B[sc];W[se];B[re]) (;W[pd];B[sc]) (;W[sc];B[pd];W[se]C[ko]))) (;W[sc];B[rc];W[se]C[ko]) (;W[pe];B[rc];W[se];B[re])) (;W[sd];B[qd])) (;W[qd];B[qf])) (;W[qf];B[sf] (;W[rd];B[sd] (;W[qd];B[rc]) (;W[qe];B[se] (;W[rc];B[qd]) (;W[qd];B[rc])) (;W[rc];B[qd];W[qe];B[se])) (;W[sd];B[rd])) (;W[qe];B[rd] (;W[sf];B[qf]) (;W[qf];B[sf])) (;W[qd];B[rd] (;W[qf];B[sf];W[rc];B[rb]) (;W[sf];B[qf]))) (;W[sk]C[NOTTHIS]) (;W[sl]C[NOTTHIS])) (;B[rk]C[NOTTHIS];W[sg];B[sf];W[sg];B[sh];W[sf];B[qf];W[qe])) (;W[rs]C[NOTTHIS])) (;W[rk]C[This move easily kill black after T3-T2 exchangeRIGHT]))) (;W[rk];B[sq];W[sl];B[sm])) (;W[sn];B[sq] (;W[rs];B[rk] (;W[qr];B[sg]) (;W[sg];B[ss]C[ko])) (;W[rk];B[rs])) (;W[rk];B[sq] (;W[rs];B[qs] (;W[sn];B[ss]) (;W[sl];B[qr]) (;W[qr];B[ss];W[sl];B[sm])) (;W[sl];B[sm]) (;W[sk];B[sm] (;W[sl];B[qm];W[rs];B[qs]) (;W[rs];B[qs]) (;W[qs];B[rs]))) (;W[rs];B[rk] (;W[sg];B[sm] (;W[sq];B[ss];W[sq];B[sr]) (;W[qr];B[sn];W[sq];B[qm])) (;W[sn];B[sg]) (;W[qr];B[sg]))) (;B[sq]C[NOTTHIS];W[rr])) (;W[rr];B[rk] (;W[qr];B[sg]) (;W[sg];B[sm])) (;W[sn] (;B[sq]C[CHOICE];W[rk];B[qr]) (;B[rk]C[CHOICE] (;W[sq];B[sg]) (;W[sg];B[sq]))) (;W[rk];B[qr] (;W[sl];B[sk] (;W[sm];B[qm];W[sj]C[ko]) (;W[sj];B[qm] (;W[sk];B[sm]) (;W[sm];B[sk]C[ko]))) (;W[sk];B[sm] (;W[qs];B[rs]) (;W[sl];B[qm]) (;W[sr];B[sq] (;W[rs];B[qs]) (;W[qs];B[rs]) (;W[sl];B[qm]))) (;W[sr];B[sq] (;W[rs];B[qs];W[ps];B[sm]) (;W[sl];B[sm] (;W[sk];B[qm]) (;W[sn];B[qm];W[qs];B[sm] (;W[rs];B[rn]) (;W[rn];B[rs]))) (;W[sk];B[sm] (;W[rs];B[qs]) (;W[qs];B[rs]) (;W[sl];B[qm]))) (;W[rs];B[qs];W[sl];B[sk] (;W[sj];B[qm];W[sm];B[sk]C[ko]) (;W[sm];B[qm];W[sj]C[ko]))) (;W[qr];B[rk] (;W[sn];B[sg]) (;W[sg];B[sm])) (;W[sg];B[qr] (;W[rk];B[sm]) (;W[sr];B[sq] (;W[qs];B[rs];W[ps];B[sm]) (;W[rs];B[qs];W[ps];B[sm]) (;W[rk];B[sm] (;W[qs];B[rs]) (;W[rs];B[qs]))))) (;W[qf];B[rk]LB[rh:1]LB[sj:2]C[Black has 2 eyes]) (;W[rk];B[qf] (;W[qe];B[re]) (;W[re];B[qe])) (;W[qn];B[qf] (;W[re];B[qe]) (;W[qe];B[re])) (;W[sf];B[qf];W[qe];B[sg] (;W[re];B[rk]) (;W[rd];B[rk]) (;W[rk];B[re])) (;W[re];B[rk]) (;W[sr];B[rk]))