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flag problem... (4) Well Constructed (3) Needs Fixing (1) Invalid Duplicate
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Problem 12929
Created 2009-07-17
Source KGS Game
Rating
Difficulty 9 kyu
Average Solve Time 95 secs
User Attempts
1439 / 3612
Solve Ratio Rating 6 kyu
rating history
Try to kill all of black's side group, knowing that neither side has a single ko threat worth this much anywhere else on the board. Be sure to navigate to see some really interesting variations.
Comments and additional variations welcome. :)
Thanks to those who have caught some of my mistakes! :)
(;AW[ah]AW[bh]AW[bg]AW[cg]AW[cf]AW[ce]AW[dd]AW[de]AW[ee]AW[fe]AW[ff]AW[fg]AW[fh]AW[gh]AW[dj]AW[dk]AW[dl]AW[fj]AW[fk]AW[fl]AW[gj]AW[hi]AW[ii]AW[ji]AW[ij]AW[ik]AW[jh]AW[jg]AW[ig]AW[if]AW[hl]AW[gm]AW[em]AW[dn]AW[bo]AW[co]AW[cp]AW[dp]AB[df]AB[ef]AB[eg]AB[dg]AB[di]AB[eh]AB[ei]AB[fi]AB[gi]AB[el]AB[ch]AB[bi]AB[cj]AB[cl]AB[cm]AB[bm]AB[fm]AB[fn]AW[ac]AW[bc]AW[cc]AW[bd]AB[ad]AB[ag]AB[bf]AB[be]AB[bb]AB[cb]AB[db]AB[dc]AB[fc]AB[fd]AB[gd]AB[ge]AB[gf]AB[gg]AB[hg]AB[hh]AB[ih]AB[bp]AB[bq]AB[cq]AB[dq]AB[dr]AB[er]AB[fr]AW[eq]AW[fq]AW[gp]AW[gr]C[]AP[goproblems]
(;W[ck];B[bk])
(;W[ak];B[ai])
(;W[bk];B[ck]
(;W[ai];B[aj]C[]
(;W[bj];B[ci]C[Black had no ko threats worth this much.]
(;W[ak]C[RIGHT])
(;W[an];B[bl];W[ak]C[RIGHT])
(;W[ap];B[al];W[ak];B[an]
(;W[bn]C[RIGHT])
(;W[ao];B[bn]))
(;W[ao]C[RIGHT])
(;W[bn]C[RIGHT])
(;W[cd];B[al];W[ak];B[an];W[ao];B[bn])
(;W[al];B[bl];W[ak];B[am];W[aj];B[ao])
(;W[am];B[al]
(;W[an];B[bl])
(;W[ak];B[ao]
(;W[bl];B[bn])
(;W[bn];B[an])))
(;W[bl];B[al]))
(;W[ak];B[bj])
(;W[al]
(;B[am];W[bj];B[ci];W[ak];B[ao]C[Black connects.])
(;B[bj]
(;W[am];B[an]
(;W[bn];B[bl];W[ao];B[ak])
(;W[ao];B[bn])
(;W[bl];B[ak]))
(;W[an];B[am])))
(;W[bl];B[al])
(;W[am]
(;B[al]
(;W[bj];B[ci]
(;W[an];B[bl])
(;W[ak];B[ao]
(;W[bl];B[bn])
(;W[bn];B[an])))
(;W[ak];B[ao]
(;W[bl];B[bn])
(;W[bn];B[an])
(;W[bj];B[ci]
(;W[bl];B[bn])
(;W[bn];B[an])))
(;W[bl];B[ao]
(;W[bn];B[an])
(;W[ak];B[bn])))
(;B[ak]
(;W[bl];B[al])
(;W[al];B[bj]C[Oiotoshi (connect-and-die) for the second eye.])
(;W[an];B[al])))
(;W[an];B[bj]
(;W[al];B[am])
(;W[bl];B[am])
(;W[am];B[al])))
(;W[bj];B[ai]
(;W[aj];B[ci])
(;W[al];B[am];W[aj];B[ci])
(;W[an];B[am];W[aj];B[ci]))
(;W[aj];B[ai];W[bj];B[ci])
(;W[an];B[ak]
(;W[ai];B[aj]
(;W[al];B[bj]C[Oiotoshi (connect-and-die) for the second eye.])
(;W[bl];B[al]))
(;W[am];B[al]
(;W[aj];B[bl]C[Oiotoshi (connect-and-die) for the second eye.])
(;W[ai];B[aj]))
(;W[al];B[aj]
(;W[am];B[bl])
(;W[bl];B[am]))
(;W[aj];B[ai]
(;W[al];B[am];W[bj];B[ci])
(;W[bj];B[ci];W[al];B[am])
(;W[bl];B[bj]))
(;W[bj];B[aj])
(;W[bl];B[al]))
(;W[al];B[am]
(;W[ai];B[aj];W[bj];B[ci];W[ak];B[ao]C[Black connects.])
(;W[aj];B[ai];W[bj];B[ci])
(;W[bj];B[ai];W[aj];B[ci])
(;W[ak];B[ai])
(;W[bl];B[ai]))
(;W[am];B[an]
(;W[ao];B[bn]
(;W[ai];B[aj]
(;W[bj];B[ci]
(;W[ak];B[bl]C[Oiotoshi (connect-and-die) for the second eye.])
(;W[al];B[bl]C[Snapback. :/])
(;W[bl];B[ak];W[al];B[aj]C[Snapback. :/]))
(;W[ak];B[bj]))
(;W[aj];B[ai];W[bj];B[ci])
(;W[bj];B[ai];W[aj];B[ci]))
(;W[bn];B[al]
(;W[ai];B[aj]
(;W[ak];B[bj])
(;W[bj];B[ci]))
(;W[aj];B[ai];W[bj];B[ci])
(;W[bj];B[ai];W[aj];B[ci]))
(;W[al];B[bn]
(;W[ai];B[aj]
(;W[bj];B[bl]C[Snapback. :/])
(;W[ak];B[bj]))
(;W[aj];B[ai];W[bj];B[ci])
(;W[bj];B[ai];W[aj];B[ci]))
(;W[bl];B[al]
(;W[bj];B[ai])
(;W[ai];B[aj])
(;W[ak];B[ai];W[am];B[bn])
(;W[aj];B[ai])))
(;W[ak];B[ai];W[am];B[an]
(;W[bn];B[al])
(;W[ao];B[bn]))
(;W[bl];B[ai];W[am];B[an]
(;W[bn];B[al])
(;W[al];B[bn])))
(;W[aj];B[ai]
(;W[bj];B[ci]
(;W[ck];B[bk])
(;W[bk];B[ck])
(;W[al];B[am]
(;W[ck];B[bk])
(;W[bk];B[ck]))
(;W[an];B[am]
(;W[ck];B[bk])
(;W[bk];B[ck]))
(;W[am]
(;B[al];W[ck];B[bk])
(;B[an]
(;W[al];B[bl]
(;W[bk];B[ck])
(;W[bn];B[ak]
(;W[ck];B[bk])
(;W[bk];B[ck])))
(;W[bk];B[ck]
(;W[bn];B[al])
(;W[al];B[bn])))))
(;W[ck];B[bk])
(;W[bk];B[ck];W[bj];B[ci]))
(;W[an];B[ck]
(;W[am];B[ak]
(;W[al];B[aj])
(;W[aj];B[ai]))
(;W[ak];B[al];W[ai];B[bk];W[aj];B[am]))
(;W[bj];B[bk]
(;W[aj];B[ci]
(;W[ck];B[ai])
(;W[ai];B[ck]))
(;W[ck];B[aj])
(;W[ai];B[aj]))
(;W[al];B[ai]
(;W[ck];B[bk]
(;W[am];B[aj]
(;W[ak];B[an]
(;W[bn];B[bl])
(;W[ao];B[bn]))
(;W[bl];B[an]
(;W[bn];B[ak])
(;W[ao];B[bn])))
(;W[ak];B[am])
(;W[aj];B[am])
(;W[bl];B[am])
(;W[an];B[am]))
(;W[bk];B[ck]
(;W[am];B[an]
(;W[bn];B[ak]
(;W[ao];B[bl]
(;W[aj];B[bj]C[Oiotoshi (connect-and-die) for the second eye.])
(;W[bj];B[aj]))
(;W[aj];B[bj];W[ao];B[bl])
(;W[bj];B[bl]))
(;W[ao];B[bn]))
(;W[bj];B[am];W[aj];B[ci])
(;W[aj];B[am];W[bj]))
(;W[am];B[an]
(;W[bn];B[ak];W[ao];B[bk])
(;W[bl];B[bk])
(;W[bk];B[ck]
(;W[bn];B[ak]
(;W[ao];B[bl]
(;W[aj];B[bj]C[Oiotoshi (connect-and-die) for the second eye.])
(;W[bj];B[aj]))
(;W[aj];B[bj];W[ao];B[bl])
(;W[bj];B[bl]))
(;W[ao];B[bn]))
(;W[ck];B[bk]
(;W[bn];B[bl];W[ao];B[ak])
(;W[ao];B[bn]))
(;W[bj];B[ck]
(;W[bn];B[ak];W[ao];B[bl])
(;W[ao];B[bn]))
(;W[aj];B[bl]
(;W[bn];B[ak]
(;W[bk];B[bj];W[ck];B[am])
(;W[ck];B[bk]))
(;W[ao];B[bn]
(;W[ck];B[bk])
(;W[bk];B[ck]))
(;W[bk];B[ck]
(;W[bn];B[ak];W[al];B[am])
(;W[ao];B[bn])))
(;W[ak];B[bn]
(;W[ck];B[bk])
(;W[bk];B[ck])))
(;W[bl];B[am]
(;W[bk];B[ck])
(;W[ck];B[bk]))
(;W[ak];B[am];W[ck];B[bk]))
(;W[bl];B[bk]
(;W[ai];B[aj])
(;W[ck];B[al]))
(;W[am];B[al]
(;W[bk];B[ck]
(;W[ak];B[an]
(;W[ai];B[bn]
(;W[aj];B[bl])
(;W[bl];B[aj]
(;W[am];B[bj])
(;W[bj];B[aj]))
(;W[bj]
(;B[bl])
(;B[ci]
(;W[bl];B[aj])
(;W[aj];B[bl]))))
(;W[aj];B[ai];W[bj];B[ci])
(;W[bj];B[ai];W[aj];B[ci]))
(;W[ai]C[Black is caught in a snapback and oiotoshi (connect-and-die).];B[aj]
(;W[bj];B[ci])
(;W[ak];B[ao]
(;W[bl];B[bn])
(;W[bn];B[an])
(;W[bj];B[ci]))
(;W[bl];B[ao]
(;W[bn];B[an])
(;W[ak])))
(;W[aj];B[ai]
(;W[bl];B[bj]C[Snapback. :/])
(;W[bj];B[ci]))
(;W[bl];B[an]
(;W[bj];B[ai])
(;W[ai];B[aj])
(;W[ak];B[ai];W[am];B[bn])
(;W[aj];B[ai])))
(;W[ai];B[aj]
(;W[bk];B[ck]
(;W[bj];B[ci])
(;W[ak];B[ao]
(;W[bl];B[bn])
(;W[bn];B[an])
(;W[bj];B[ci]))
(;W[bl];B[ao]
(;W[bn];B[an])
(;W[ak])))
(;W[ck];B[bk]))
(;W[aj];B[ai]
(;W[bk];B[ck]
(;W[bl];B[bj]C[Snapback. :/])
(;W[bj];B[ci]))
(;W[ck];B[bk]))
(;W[ck];B[bk]
(;W[aj];B[ai])
(;W[ai];B[aj]))
(;W[bj];B[bk]
(;W[aj]
(;B[ak])
(;B[ck]))
(;W[ai];B[aj]))
(;W[ak];B[bk]
(;W[aj];B[ai]
(;W[bl];B[an]
(;W[bn];B[al])
(;W[ao];B[bn];W[ck];B[al])
(;W[al];B[bj]))
(;W[an];B[bl]))
(;W[ai];B[aj])))
(;W[ai];B[bk]
(;W[aj];B[ck]
(;W[al];B[am]
(;W[ao];B[ak])
(;W[ak];B[ao]))
(;W[ak];B[al];W[an];B[am])
(;W[bj];B[ci])
(;W[an];B[al])
(;W[am];B[al]))
(;W[ck];B[aj])
(;W[ak];B[al]
(;W[aj];B[ck];W[an])
(;W[ck];B[aj]))
(;W[al];B[am])
(;W[am];B[aj])))
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