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flag problem... Well Constructed Needs Fixing Invalid Duplicate
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Problem 11077
Created 2008-03-17
Source Shower
Rating
Difficulty 9 dan
Average Solve Time 130 secs
User Attempts
18 / 258
Solve Ratio Rating 5 dan
rating history
Black played the marked stone and thinks it was two points better than solid connection. Do your best!
!!!!!!!!!!!!!!!!!!!
If you want to cut the stone on the first line, play out the right side first. I will try to cover all the possible variations, but they are Really Many and i am only a mouse. Cutting the first line stone, then playing one move elsewhere and then playing atari there again and then elsewhere is very risky thing!
!!!!!!!!!!!!!!!!!!!
(;AB[rp]AB[qo]AB[pp]AB[pn]AB[on]AB[om]AB[nm]AB[nl]AB[ml]AB[ll]AB[lm]AB[ln]AB[lo]AB[kn]AB[jo]AB[jp]AB[kp]AB[ip]AB[hp]AB[hq]AB[hr]AB[is]AW[hs]AW[gs]AW[gr]AW[gq]AW[gp]AW[ho]AW[io]AW[go]AW[in]AW[jn]AW[jm]AW[km]AW[kl]AW[kk]AW[lk]AW[mk]AW[nk]AW[ok]AW[ol]AW[pm]AW[qn]AW[rn]AW[ro]AW[ql]AW[rl]AW[oo]AW[op]AB[no]AB[np]AB[oq]AB[nq]AW[nn]AB[ns]TR[ns]C[White to play]AP[goproblems]
(;W[sp]
(;B[sq]
(;W[rq];B[so]
(;W[qq];B[qp]
(;W[sr];B[sp]
(;W[pr]
(;B[rs]
(;W[qs];B[rr];W[ir];B[js];W[jr];B[ks]
(;W[lr];B[ls];W[mr];B[ms];W[nr];B[or];W[os]C[Big koRIGHT])
(;W[kr];B[ls];W[mr];B[ms];W[nr];B[or];W[os]C[Mega ko :)RIGHT]))
(;W[ir];B[js];W[jr];B[ks]
(;W[lr];B[ls]
(;W[mr];B[ms];W[qs];B[rr];W[nr];B[or];W[os]C[Big koRIGHT])
(;W[qs];B[rr];W[mr];B[ms];W[nr];B[or];W[os]C[Big koRIGHT]))
(;W[kr];B[ls]
(;W[mr];B[ms];W[qs];B[rr];W[nr];B[or];W[os]C[Mega ko :)RIGHT])
(;W[qs];B[rr];W[mr];B[ms];W[nr];B[or];W[os]C[Mega ko :)RIGHT]))
(;W[qs];B[rr]
(;W[lr];B[ls];W[mr];B[ms];W[nr];B[or];W[os]C[Big koRIGHT])
(;W[kr];B[ls];W[mr];B[ms];W[nr];B[or];W[os]C[Mega ko :)RIGHT]))))
(;B[rr]C[NOTTHIS];W[rs]C[Of course black can make this ko.RIGHT]))
(;W[rs];B[qr];W[pr];B[pq];W[rr];B[ps];W[qs];B[os])
(;W[qr];B[rs])
(;W[ir];B[js];W[jr];B[ks]
(;W[lr];B[ls]
(;W[pr];B[rs])
(;W[mr];B[ms]))
(;W[kr];B[ls]
(;W[pr];B[rs])
(;W[mr];B[ms]))
(;W[pr];B[rs]
(;W[lr];B[ls]
(;W[mr];B[ms];W[qs];B[rr])
(;W[qs];B[rr]))
(;W[kr];B[ls]
(;W[mr];B[ms];W[qs];B[rr])
(;W[qs];B[rr]))
(;W[qs];B[rr]))))
(;W[ir];B[js]
(;W[sr];B[sp];W[pr];B[rs];W[qs];B[rr])
(;W[jr];B[ks]
(;W[sr];B[sp])
(;W[kr];B[ls])
(;W[lr];B[ls]))))
(;W[sr];B[sp]
(;W[qq];B[qp]
(;W[pr]
(;B[rs]
(;W[qs];B[rr];W[ir];B[js];W[jr];B[ks]
(;W[lr];B[ls];W[mr];B[ms];W[nr];B[or];W[os]C[Big koRIGHT])
(;W[kr];B[ls];W[mr];B[ms];W[nr];B[or];W[os]C[Mega ko :)RIGHT]))
(;W[ir];B[js];W[jr];B[ks]
(;W[lr];B[ls]
(;W[mr];B[ms];W[qs];B[rr])
(;W[qs];B[rr]))
(;W[kr];B[ls]
(;W[mr];B[ms];W[qs];B[rr])
(;W[qs];B[rr]))
(;W[qs];B[rr])))
(;B[rr]C[NOTTHIS];W[rs]C[Of course black can make this ko.RIGHT]))
(;W[rs];B[qr];W[pr];B[pq];W[rr];B[ps];W[qs];B[os])
(;W[qr];B[rs])
(;W[ir];B[js];W[jr];B[ks]
(;W[lr];B[ls])
(;W[kr];B[ls])
(;W[pr];B[rs])))
(;W[ir];B[js]
(;W[qq];B[qp];W[pr];B[rs];W[qs];B[rr])
(;W[jr];B[ks])))
(;W[ir];B[js]
(;W[qq];B[qp]
(;W[sr];B[sp])
(;W[jr];B[ks]))
(;W[sr];B[sp]
(;W[qq];B[qp];W[pr];B[rs];W[qs];B[rr];W[jr];B[ks]
(;W[lr];B[ls];W[mr];B[ms];W[nr];B[or];W[os]C[Big koRIGHT])
(;W[kr];B[ls];W[mr];B[ms];W[nr];B[or];W[os]C[Mega ko :)RIGHT]))
(;W[jr];B[ks]
(;W[qq];B[qp])
(;W[kr];B[ls])))
(;W[jr];B[ks]
(;W[qq];B[qp]
(;W[sr];B[sp])
(;W[kr];B[ls])
(;W[lr];B[ls]))
(;W[sr];B[sp]
(;W[qq];B[qp])
(;W[kr];B[ls]))
(;W[lr];B[ls])
(;W[kr];B[ls]))))
(;W[ir];B[js]
(;W[rq];B[so]
(;W[qq];B[qp])
(;W[sr];B[sp]
(;W[qq];B[qp];W[pr];B[rs];W[qs];B[rr])
(;W[jr];B[ks]))
(;W[jr];B[ks]))
(;W[jr];B[ks]
(;W[rq];B[so]
(;W[qq];B[qp]
(;W[sr];B[sp])
(;W[kr];B[ls])
(;W[lr];B[ls]))
(;W[sr];B[sp]
(;W[qq];B[qp])
(;W[kr];B[ls]))
(;W[lr];B[ls])
(;W[kr];B[ls]))
(;W[kr];B[ls];W[mr];B[ms];W[rq];B[so]
(;W[qq];B[qp];W[sr];B[sp]
(;W[pr];B[rs])
(;W[nr];B[or];W[pr];B[os]
(;W[rs];B[ps];W[qs];B[qr])
(;W[qs];B[ps];W[rs];B[qr];W[rr];B[pq])))
(;W[sr];B[sp]))
(;W[lr];B[ls])))
(;W[qq];B[qp]
(;W[rq];B[so])
(;W[ir];B[js])))
(;B[rq]C[NOTTHIS];W[sq];B[sr];W[so];B[rr]C[Correct answer; O1 move only gives white more ko threats.RIGHT]))
(;W[rq];B[sp];W[qq];B[qp];W[pr];B[os])
(;W[ir];B[js]
(;W[sp];B[sq]
(;W[rq];B[so])
(;W[jr];B[ks]))
(;W[jr];B[ks]
(;W[sp];B[sq]
(;W[rq];B[so]
(;W[qq];B[qp]
(;W[sr];B[sp]
(;W[lr];B[ls])
(;W[kr];B[ls])
(;W[pr];B[rs]))
(;W[kr];B[ls]
(;W[sr];B[sp]
(;W[pr];B[rs])
(;W[mr];B[ms]))
(;W[mr];B[ms]))
(;W[lr];B[ls];W[sr];B[sp]))
(;W[sr];B[sp]
(;W[qq];B[qp]
(;W[lr];B[ls])
(;W[kr];B[ls])
(;W[pr];B[rs]))
(;W[kr];B[ls]
(;W[qq];B[qp])
(;W[mr];B[ms];W[qq];B[qp])))
(;W[lr];B[ls]
(;W[qq];B[qp];W[sr];B[sp])
(;W[sr];B[sp]
(;W[qq];B[qp]
(;W[pr];B[rs])
(;W[mr];B[ms]))
(;W[mr];B[ms]))
(;W[mr];B[ms]
(;W[qq];B[qp];W[sr];B[sp];W[pr];B[rs])
(;W[sr];B[sp];W[qq];B[qp];W[pr];B[rs])))
(;W[kr];B[ls]
(;W[qq];B[qp]
(;W[sr];B[sp]
(;W[pr];B[rs])
(;W[mr];B[ms]))
(;W[mr];B[ms]))
(;W[sr];B[sp]
(;W[qq];B[qp])
(;W[mr];B[ms];W[qq];B[qp]))
(;W[mr];B[ms])))
(;W[kr];B[ls];W[mr];B[ms];W[rq];B[so]
(;W[qq];B[qp];W[sr];B[sp]
(;W[pr];B[rs];W[qs];B[rr])
(;W[nr];B[or];W[pr];B[os]
(;W[rs];B[ps];W[qs];B[qr];W[rr];B[pq])
(;W[qs];B[ps];W[rs];B[qr];W[rr];B[pq])))
(;W[sr];B[sp];W[qq];B[qp]))
(;W[lr];B[ls]
(;W[rq];B[so]
(;W[qq];B[qp];W[sr];B[sp])
(;W[sr];B[sp]
(;W[qq];B[qp]
(;W[pr];B[rs])
(;W[mr];B[ms]))
(;W[mr];B[ms]))
(;W[mr];B[ms]
(;W[qq];B[qp];W[sr];B[sp];W[pr];B[rs])
(;W[sr];B[sp];W[qq];B[qp];W[pr];B[rs])))
(;W[mr];B[ms];W[rq];B[so]
(;W[qq];B[qp];W[sr];B[sp];W[pr];B[rs])
(;W[sr];B[sp];W[qq];B[qp];W[pr];B[rs]))))
(;W[kr];B[ls]
(;W[sp];B[sq]
(;W[rq];B[so]
(;W[qq];B[qp]
(;W[sr];B[sp]
(;W[pr];B[rs]
(;W[mr];B[ms];W[qs];B[rr])
(;W[qs];B[rr]))
(;W[mr];B[ms]
(;W[pr];B[rs])
(;W[nr];B[or];W[pr];B[os]
(;W[rs];B[ps];W[qs];B[qr])
(;W[qs];B[ps];W[rs];B[qr];W[rr];B[pq]))))
(;W[mr];B[ms];W[sr];B[sp]
(;W[pr];B[rs])
(;W[nr];B[or];W[pr];B[os]
(;W[rs];B[ps];W[qs];B[qr])
(;W[qs];B[ps];W[rs];B[qr];W[rr];B[pq]))))
(;W[sr];B[sp]
(;W[qq];B[qp]
(;W[pr];B[rs])
(;W[mr];B[ms]))
(;W[mr];B[ms];W[qq];B[qp]
(;W[pr];B[rs])
(;W[nr];B[or];W[pr];B[os]
(;W[rs];B[ps];W[qs];B[qr])
(;W[qs];B[ps];W[rs];B[qr];W[rr];B[pq]))))
(;W[mr];B[ms]
(;W[qq];B[qp];W[sr];B[sp]
(;W[pr];B[rs])
(;W[nr];B[or];W[pr];B[os]
(;W[rs];B[ps];W[qs];B[qr])
(;W[qs];B[ps];W[rs];B[qr];W[rr];B[pq])))
(;W[sr];B[sp])))
(;W[mr];B[ms];W[rq];B[so]
(;W[qq];B[qp];W[sr];B[sp]
(;W[pr];B[rs])
(;W[nr];B[or];W[pr];B[os]
(;W[rs];B[ps];W[qs];B[qr])
(;W[qs];B[ps];W[rs];B[qr];W[rr];B[pq])))
(;W[sr];B[sp])))
(;W[mr];B[ms];W[sp];B[sq];W[rq];B[so]
(;W[qq];B[qp];W[sr];B[sp]
(;W[pr];B[rs])
(;W[nr];B[or];W[pr];B[os]
(;W[rs];B[ps];W[qs];B[qr])
(;W[qs];B[ps];W[rs];B[qr];W[rr];B[pq])))
(;W[sr];B[sp])))
(;W[lr];B[ls]
(;W[sp];B[sq]
(;W[rq];B[so]
(;W[qq];B[qp];W[sr];B[sp]
(;W[pr];B[rs])
(;W[mr];B[ms]))
(;W[sr];B[sp]
(;W[qq];B[qp]
(;W[pr];B[rs]
(;W[mr];B[ms];W[qs];B[rr])
(;W[qs];B[rr]))
(;W[mr];B[ms];W[pr];B[rs]))
(;W[mr];B[ms];W[qq];B[qp];W[pr];B[rs]))
(;W[mr];B[ms]
(;W[qq];B[qp];W[sr];B[sp];W[pr];B[rs];W[qs];B[rr])
(;W[sr];B[sp];W[qq];B[qp];W[pr];B[rs];W[qs];B[rr])))
(;W[mr];B[ms];W[rq];B[so]
(;W[qq];B[qp];W[sr];B[sp];W[pr];B[rs];W[qs];B[rr])
(;W[sr];B[sp];W[qq];B[qp];W[pr];B[rs];W[qs];B[rr])))
(;W[mr];B[ms];W[sp];B[sq];W[rq];B[so]
(;W[qq];B[qp];W[sr];B[sp];W[pr];B[rs])
(;W[sr];B[sp];W[qq];B[qp];W[pr];B[rs])))))
(;W[qq]
(;B[qp]
(;W[rq];B[sp];W[pr];B[os])
(;W[sp];B[sq]
(;W[rq];B[so]
(;W[sr];B[sp]
(;W[pr]
(;B[rs]
(;W[qs];B[rr];W[ir];B[js];W[jr];B[ks]
(;W[lr];B[ls];W[mr];B[ms];W[nr];B[or];W[os]C[Big koRIGHT])
(;W[kr];B[ls];W[mr];B[ms];W[nr];B[or];W[os]C[Mega ko :)RIGHT]))
(;W[ir];B[js];W[jr];B[ks]
(;W[lr];B[ls]
(;W[mr];B[ms];W[qs];B[rr])
(;W[qs];B[rr]))
(;W[kr];B[ls]
(;W[mr];B[ms];W[qs];B[rr])
(;W[qs];B[rr]))
(;W[qs];B[rr])))
(;B[rr]C[NOTTHIS];W[rs]C[Of course black can make this ko.RIGHT]))
(;W[rs];B[qr];W[pr];B[pq];W[rr];B[ps];W[qs];B[os])
(;W[qr];B[rs])
(;W[ir];B[js];W[jr];B[ks]
(;W[lr];B[ls])
(;W[kr];B[ls])
(;W[pr];B[rs])))
(;W[ir];B[js]
(;W[sr];B[sp])
(;W[jr];B[ks])))
(;W[ir];B[js]
(;W[rq];B[so])
(;W[jr];B[ks]
(;W[rq];B[so])
(;W[lr];B[ls]
(;W[rq];B[so])
(;W[mr];B[ms];W[rq];B[so]))
(;W[kr];B[ls]
(;W[rq];B[so])
(;W[mr];B[ms];W[rq];B[so])))))
(;W[ir];B[js];W[sp];B[sq]
(;W[rq];B[so]
(;W[sr];B[sp])
(;W[jr];B[ks]))
(;W[jr];B[ks]
(;W[rq];B[so]
(;W[sr];B[sp])
(;W[kr];B[ls])
(;W[lr];B[ls]))
(;W[lr];B[ls]
(;W[rq];B[so];W[sr];B[sp])
(;W[mr];B[ms];W[rq];B[so];W[sr];B[sp];W[pr];B[rs]))
(;W[kr];B[ls]
(;W[rq];B[so]
(;W[sr];B[sp]
(;W[pr];B[rs])
(;W[mr];B[ms]))
(;W[mr];B[ms]))
(;W[mr];B[ms];W[rq];B[so];W[sr];B[sp]
(;W[pr];B[rs])
(;W[nr];B[or];W[pr];B[os]
(;W[rs];B[ps];W[qs];B[qr])
(;W[qs];B[ps];W[rs];B[qr];W[rr];B[pq])))))))
(;B[rq];W[qp];B[po];W[rr];B[qr]
(;W[sq];B[pq];W[sp]C[RIGHT])
(;W[sp];B[pq];W[sq]C[RIGHT]))))
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