Problem 2621 goproblems.com


Author	Spica	Created	2003-06-23
Difficulty	9 dan (history)	Source	Spica
AVG solve time	56 sec	Stars	5 (6 votes)
User attempts	117 / 2366	Collections	7x7 Endgames
Genre	endgame	Your attempts	N/A
Similar problems
Created	2003-06-23
Source	Spica
Stars	5 (6 votes)
Collections	7x7 Endgames
Your attempts	N/A

(;SZ[7]AB[bd]AB[cd]AB[db]AB[dc]AB[fa]AB[fb]AB[gc]AB[ge]AB[ff]AB[fg]AB[cb]AB[gb]AB[ac]AB[ba]AW[be]AW[ce]AW[dd]AW[ec]AW[eb]AW[ea]AW[ee]AW[ef]AW[fc]AW[cc]AW[gg]AW[ca]AW[fd]C[Black's best result? (No komi, no prisoners, Japanese rules).]FF[4]GM[1]AP[SGFC:1.14]GN[tempeg7] (;B[gd] (;W[da] (;B[bc];W[fe] (;B[eg];W[dg];B[gf];W[af] (;B[ae];W[ad] (;B[df];W[cg];B[ae];W[bb];B[ab];W[ad] (;B[bf];W[cf];B[ae];W[bg];B[ad]C[Black wins by 1 pt. RIGHT]) (;B[cf];W[bg];B[ae]C[white passes, black connects - jigo]) (;B[de];W[cf];B[ae]C[White passes, black connects - jigo]) (;B[bg];W[cf];B[ae]C[white passes, black connects - jigo])) (;B[de];W[df];B[ae];W[bb];B[ab];W[ad]C[black loses by 1]) (;B[cg];W[df];B[ae];W[bb];B[ab];W[ad]C[black loses by 1]) (;B[cf];W[df];B[ae];W[bb];B[ab];W[ad]C[black loses by 1]) (;B[bf];W[df];B[ae];W[bb];B[ab];W[ad]C[black loses by 1]) (;B[bg];W[df];B[ae];W[bb];B[ab];W[ad]C[black loses by 1])) (;B[ad];W[ae]C[jigo]) (;B[df];W[cg]C[black must settle for jigo now]) (;B[cg];W[df]C[black must settle for jigo now]) (;B[bg];W[df]C[black must settle for jigo now]) (;B[cf];W[df]C[black must settle for jigo now]) (;B[bf];W[df]C[black must settle for jigo now])) (;B[df];W[eg] (;B[gf];W[cf];B[ae];W[af];B[ad]C[black loses by 1]) (;B[de];W[gf] (;B[ed];W[cf] (;B[dg];W[dd]C[black loses big]) (;B[dd];W[dg]C[black loses big])) (;B[cf];W[bf] (;B[ed];W[cg];B[dd];W[dg]C[black loses big]) (;B[cg];W[ed]) (;B[bg];W[cg] (;B[dg];W[cg]) (;B[ed];W[dg];B[dd];W[ae] (;B[ad];W[ag]C[white wins big]) (;B[ag];W[af] (;B[ad];W[bg]C[white wins big]) (;B[bg];W[ag];B[ad];W[bg]C[white wins big])))) (;B[af];W[cg];B[ed];W[dg];B[dd];W[ae]C[easy white win]) (;B[ae];W[cg];B[ed];W[dg];B[dd];W[bg];B[af]C[easy white win])) (;B[bf];W[cf];B[ed];W[dg]C[black loses big]) (;B[dg];W[ed]C[Black loses big]) (;B[cg];W[cf];B[ed];W[dg];B[dd];W[ae] (;B[ad];W[bg]C[Black loses big]) (;B[bg];W[bf];B[ad];W[ag]C[black loses big])))) (;B[ae];W[eg];B[gf];W[af] (;B[ad];W[bf]C[jigo]) (;B[bf];W[ad] (;B[df];W[de];B[ae];W[bb];B[ab];W[ad]C[black loses by 3]) (;B[de];W[df];B[ae];W[bb];B[ab];W[ad]C[black loses by 3]))) (;B[gf];W[eg];B[ae];W[af] (;B[ad];W[bf]C[jigo]) (;B[bf];W[ad] (;B[de];W[df];B[ae];W[bb];B[ab];W[ad]C[black loses by 3]) (;B[df];W[de];B[ae];W[bb];B[ab];W[ad]C[black loses by 3])))) (;B[bb];W[fe] (;B[eg];W[dg];B[gf];W[af] (;B[ad];W[ae]C[jigo]) (;B[ae];W[ad];B[bc];W[ae]C[Black's shape at the top isn't strong enough to play ko here. black loses by 2])) (;B[ae];W[eg];B[gf];W[af] (;B[ad];W[bf]C[jigo]) (;B[bf];W[ad];B[bc];W[ae]C[Black's shape at the top isn't strong enough to play ko here. black loses by 4])) (;B[df];W[eg] (;B[gf];W[cf];B[ae];W[af];B[ad]C[black loses by 1]) (;B[de];W[gf] (;B[ed];W[cf] (;B[dg];W[dd]C[black loses big]) (;B[dd];W[dg]C[black loses big])) (;B[bf];W[cf];B[ed];W[dg]C[black loses big]) (;B[cf];W[bf] (;B[ed];W[cg];B[dd];W[dg]C[black loses big]) (;B[cg];W[ed]) (;B[bg];W[cg] (;B[dg];W[cg]) (;B[ed];W[dg];B[dd];W[ae] (;B[ad];W[ag]C[easy white win]) (;B[ag];W[af] (;B[ad];W[bg]C[easy white win]) (;B[bg];W[ag];B[ad];W[bg]C[easy white win])))) (;B[af];W[cg];B[ed];W[dg];B[dd];W[ae];B[ad];W[ag]C[easy white win]) (;B[ae];W[cg];B[ed];W[dg];B[dd];W[bg];B[af]C[easy white win])) (;B[dg];W[ed]C[black loses big]) (;B[cg];W[cf];B[ed];W[dg];B[dd];W[ae];B[ad];W[bg]C[black loses big]))) (;B[gf];W[eg];B[ae];W[af] (;B[ad];W[bf]C[jigo]) (;B[bf];W[ad];B[bc]C[black's shape is not strong enough to play ko here. black loses by 4];W[ae]C[Black's shape at the top isn't strong enough to play ko here. black loses by 4])))) (;W[bb]C[this presents no danger to black];B[bc];W[aa];B[ab];W[da];B[ba]C[the score in this corner is the same as the main line but white now has no ko-threats or other aji to work with.])) (;B[da];W[gd]C[black can't recover from this loss]) (;B[ae];W[da] (;B[bb];W[gd]C[black loses by resign!]) (;B[bc];W[gd]C[black loses by resign!]) (;B[gd];W[bb]C[black loses by resign!])) (;B[df];W[gd];B[de];W[dg] (;B[ed];W[cf];B[dd];W[eg] (;B[ae];W[af] (;B[ad];W[ga];B[da]C[black loses by 11]) (;B[da];W[ga];B[ad]C[black loses by 11])) (;B[da];W[ga];B[ae];W[af];B[ad]C[black loses by 11])) (;B[cf];W[bf];B[ed];W[cg];B[dd];W[eg] (;B[da];W[ga];B[ae];W[bg];B[af];W[fe]C[black loses by 6]) (;B[ae];W[bg] (;B[af];W[fe];B[da];W[ga]C[black loses by 6]) (;B[da];W[ga];B[af];W[fe]C[black loses by 6])))) (;B[fe];W[gd]C[black loses by resign!]) (;B[eg];W[gd]C[Black loses by resign!]))