Problem 14475 goproblems.com


Author	ndkrempel	Created	2011-01-19
Difficulty	8 dan (history)	Source	N/A
AVG solve time	35 sec	Stars	4.33 (3 votes)
User attempts	37 / 220	Collections	9*9 games, Self made
Genre	life and death	Your attempts	N/A
Similar problems
Created	2011-01-19
Source	N/A
Stars	4.33 (3 votes)
Collections	9*9 games, Self made
Your attempts	N/A

(;SZ[9]AW[bh]AW[bg]AW[cg]AW[ci]AW[di]AW[dh]AW[ei]AW[bf]AW[be]AW[cd]AW[cc]AW[db]AW[eb]AW[dc]AW[ec]AW[fb]AW[ed]AW[fd]AW[ee]AW[ef]AB[dd]AB[ce]AB[de]AB[df]AB[cf]AB[dg]AB[eg]AB[eh]AB[fi]AB[fg]AB[gh]AB[ff]AB[fe]AB[gd]AB[gc]AB[fc]AB[gb]AB[fa]AB[ga]AW[ea]AB[ge]AB[gf]AB[he]AW[hg]AW[hf]AW[gg]AW[hh]AW[hi]AW[if]AB[ih]LB[aa:Yes]LB[ab:No]C[White has just played at the marked point, filling in black's last outside liberty. Does black owe a protective move inside his territory?FORCE]TR[dc]AP[goproblems] (;B[ab];W[ie]C[Ok, how do you answer white's plays then?] (;B[id];W[ib] (;B[ha];W[hd];B[hc];W[ic] (;B[hd];W[hb] (;B[ig];W[aa]C[If white passes, can you capture?] (;B[fh]C[];W[aa];B[ia];W[ib];B[gi]C[RIGHT]) (;B[ia];W[ib])) (;B[fh];W[aa]C[If white passes, can you capture?] (;B[ig]C[];W[aa];B[ia];W[ib];B[gi]C[RIGHT]) (;B[ia];W[ib]) (;B[ii];W[aa];B[ia];W[ib];B[gi]C[RIGHT])) (;B[ia];W[ib]) (;B[ii];W[aa]C[If white passes, can you capture?];B[fh];W[aa];B[ia];W[ib];B[gi]C[RIGHT])) (;B[hb];W[hd];B[bi];W[ai];B[id];W[gi] (;B[fh];W[hd]) (;B[ia];W[fh])) (;B[ia];W[hd];B[bi];W[ai];B[id];W[gi] (;B[fh];W[hd]) (;B[hb];W[fh])) (;B[fh];W[hd];B[bi];W[ai];B[id]C[Now if white passes, you must spend another move to end the ko.])) (;B[hd];W[ha] (;B[hb];W[gi];B[fh];W[ic];B[ia]C[Now if white passes, you must spend another move to end the ko.]) (;B[ig];W[hb]) (;B[fh];W[hb]) (;B[ii];W[hb])) (;B[hc];W[ic] (;B[hd];W[ha]) (;B[hb];W[hd];B[bi];W[ai];B[id];W[gi] (;B[fh];W[hd]) (;B[ia];W[fh])) (;B[ig];W[hd];B[bi];W[ai];B[id];W[ha] (;B[hd]C[Seki!]) (;B[hb];W[hd];B[ia];W[id])) (;B[fh];W[hd];B[bi];W[ai];B[id];W[ha] (;B[hd];W[gi]) (;B[hb];W[hd];B[ia];W[id]) (;B[ig];W[hd])) (;B[ha];W[hd];B[bi];W[ai];B[id];W[gi];B[fh];W[hd]) (;B[ii];W[hd];B[bi];W[ai];B[id];W[ha] (;B[hd]C[Seki!]) (;B[hb];W[hd];B[ia];W[id]))) (;B[ic];W[gi];B[fh];W[hc];B[hd];W[hb]) (;B[hb];W[ic] (;B[hd];W[gi];B[fh];W[ha];B[ia]C[Now if white passes, you must spend another move to end the ko.]) (;B[hc];W[hd];B[bi];W[ai];B[id];W[gi] (;B[fh];W[hd]) (;B[ia];W[fh]))) (;B[ia];W[ic] (;B[hd];W[ha] (;B[hb];W[gi] (;B[fh];W[hc]) (;B[ia];W[fh])) (;B[ig];W[hb]) (;B[fh];W[hb]) (;B[ii];W[hb])) (;B[hc];W[hd];B[bi];W[ai];B[id];W[ha] (;B[hd];W[gi]) (;B[hb];W[hd];B[ia];W[id]) (;B[ig];W[hd]) (;B[fh];W[hd]))) (;B[ig];W[hd];B[hc];W[ic] (;B[hd];W[ha]C[Seki!]) (;B[hb];W[hd];B[bi];W[ai];B[id]C[Now if white passes, you must spend another move to end the ko.]) (;B[fh];W[hd];B[bi];W[ai];B[id];W[ha] (;B[hb];W[hd];B[ia];W[id]) (;B[hd]C[Seki!]))) (;B[fh];W[hd];B[hc];W[ic] (;B[hd];W[ha];B[ig]C[Seki!]) (;B[hb];W[hd];B[bi];W[ai];B[id]C[Now if white passes, you must spend another move to end the ko.])) (;B[ii];W[hd];B[hc];W[ic] (;B[hd];W[ha]C[Seki!]) (;B[hb];W[hd];B[bi];W[ai];B[id]C[Now if white passes, you must spend another move to end the ko.]))) (;B[ic];W[id] (;B[hc];W[ha] (;B[ig];W[gi];B[fh];W[ib]C[Seki!]) (;B[fh];W[gi] (;B[ig];W[ib]C[Seki!]) (;B[ib]C[Seki!])) (;B[ib]C[Seki!]) (;B[hd];W[gi];B[fh];W[ib]) (;B[ii];W[gi];B[fh];W[ib]C[Seki!])) (;B[hd];W[hb] (;B[hc];W[gi];B[fh];W[ib]) (;B[ib];W[gi] (;B[ha];W[fh]) (;B[fh];W[ha])) (;B[ha];W[ib] (;B[hc];W[gi]) (;B[ig];W[hc]) (;B[ii];W[hc]))) (;B[ib];W[hd];B[hc];W[ha]) (;B[hb];W[hd] (;B[hc];W[ia]) (;B[ia];W[hc]))) (;B[ib];W[id] (;B[hc];W[ha]) (;B[ic];W[hd];B[hc];W[ha]) (;B[ha];W[hc])) (;B[hc];W[id] (;B[ic];W[ha] (;B[ig];W[gi];B[fh];W[ib]C[Seki!]) (;B[fh];W[gi] (;B[ig];W[ib]C[Seki!]) (;B[ib]C[Seki!])) (;B[ib]C[Seki!]) (;B[hd];W[gi];B[fh];W[ib]) (;B[ii];W[gi];B[fh];W[ib]C[Seki!])) (;B[ib];W[ha]))) (;B[aa];W[ab]AB[bh]AB[bg]AB[bf]AB[be]AW[cf]AW[ce]AB[cg]AB[cd]AB[cc]AB[ci]AB[db]AB[dc]AW[dd]AW[de]AW[df]AW[dg]AB[dh]AB[di]AB[ei]AW[eh]AW[eg]AB[ef]AB[ee]AB[ed]AB[ec]AB[eb]AB[ea]AW[fa]AB[fb]AW[fc]AB[fd]AW[fe]AW[ff]AW[fg]AW[fi]AW[ga]AW[gb]AW[gc]AW[gd]AW[ge]AW[gf]AB[gg]AW[gh]AW[he]AB[hf]AB[hg]AB[hh]AB[hi]AB[if]AW[ih]C[Show what you can do as black here then!] (;B[ie];W[id] (;B[ib];W[ha] (;B[hd];W[hc];B[ic];W[hd];B[hb];W[ig]LB[ac:Pass];B[ac];W[fh]LB[ad:Pass];B[ad];W[ia];B[ib];W[gi]) (;B[ic];W[hd]C[Big eye vs small eye])) (;B[ic];W[ib];B[hd];W[hc];B[id];W[ha]) (;B[hc];W[ib])) (;B[gi];W[fh];B[ie];W[id];B[ic];W[hd]) (;B[id];W[ie] (;B[hc];W[ib]) (;B[ib];W[hc];B[ic];W[ha])) (;B[ic];W[ie]) (;B[ib];W[ie] (;B[hb];W[ha]) (;B[id];W[hc];B[ic];W[ha])) (;B[hc];W[ib])))