Two wholeboard endgame problems
Posted: Thu Mar 10, 2011 3:28 am
Just a couple 9X9 wholeboard endgame problems I shared earlier in the KGS L19x19.com room. Have fun.
[sgf-full](;GM[1]FF[4]CA[UTF-8]AP[CGoban:3]ST[2]
RU[Japanese]SZ[9]KM[0.00]
AW[ba][cb][db][eb][fb][gb][hb][bc][fc][hc][ed][ee][ie][bf][cf][cg][dg][eg][ch][eh][fh][hh][bi][di][fi]AB[bb][cc][dc][ec][gc][bd][gd][hd][be][ce][de][he][af][df][ef][ff][bg][fg][gg][hg][ig][bh][gh]LB[ab:A][fd:C][id:D][ah:B][gi:E]C[Black to move
rough guess (miai values)
a - 3.5
b - 3
c - 4 ish? 3.5 to 4
d - 2
e - 2.5
So my rough feeling is c,a,b,e,d]PL[B]
;B[fd]
;W[ab]
;B[ag]
;W[gi]
;B[ic]
;W[ib]
;B[id]
;W[ad]
;B[ae]
;W[ac])[/sgf-full]
[sgf-full](;GM[1]FF[4]CA[UTF-8]AP[CGoban:3]ST[2]
RU[Japanese]SZ[9]KM[0.00]
AW[ba][da][ab][bb][cb][db][eb][hb][ac][cc][ec][fc][gc][cd][ed][be][ce][fe][ag][bg][cg][eg][ch][dh][eh][gh][hh][ih][ei][fi]AB[fb][gb][ib][bc][dc][hc][ad][bd][dd][gd][ee][ge][he][af][bf][cf][df][ef][ff][dg][fg][gg][hg][ig][fh][gi]LB[ha:F][fd:D][ae:A][de:C][bi:E][hi:B]C[Black to move
A - 3
B - 5 + seki threat
C - 2
D - 1
E - seki or ko if B
F - 4.75 (ish)
So it seems like the progression should be something like
B,F, E, ...]PL[B]
;B[hi]
;W[ha]
;B[ae]
(;W[bi]
;B[de]
;W[fd]
;B[ic]
;W[fa]
;B[ia]
;W[ga]
;B[]
;W[]TW[aa][ca][ea][fb][gb][dc][dd]TB[hd][id][ie][gf][hf][if][gh][hh][ih][ii]C[B+1])
(;W[de]
;B[bi]
;W[ci]
;B[ah]
;W[fd]
;B[ic]
;W[fa]
;B[ia]
;W[ga]
;B[]
;W[]TW[aa][ca][ea][fb][gb][dc][dd]TB[hd][id][ie][gf][hf][if][gh][hh][ih][ii]C[B+2]))[/sgf-full]
RU[Japanese]SZ[9]KM[0.00]
AW[ba][cb][db][eb][fb][gb][hb][bc][fc][hc][ed][ee][ie][bf][cf][cg][dg][eg][ch][eh][fh][hh][bi][di][fi]AB[bb][cc][dc][ec][gc][bd][gd][hd][be][ce][de][he][af][df][ef][ff][bg][fg][gg][hg][ig][bh][gh]LB[ab:A][fd:C][id:D][ah:B][gi:E]C[Black to move
rough guess (miai values)
a - 3.5
b - 3
c - 4 ish? 3.5 to 4
d - 2
e - 2.5
So my rough feeling is c,a,b,e,d]PL[B]
;B[fd]
;W[ab]
;B[ag]
;W[gi]
;B[ic]
;W[ib]
;B[id]
;W[ad]
;B[ae]
;W[ac])[/sgf-full]
[sgf-full](;GM[1]FF[4]CA[UTF-8]AP[CGoban:3]ST[2]
RU[Japanese]SZ[9]KM[0.00]
AW[ba][da][ab][bb][cb][db][eb][hb][ac][cc][ec][fc][gc][cd][ed][be][ce][fe][ag][bg][cg][eg][ch][dh][eh][gh][hh][ih][ei][fi]AB[fb][gb][ib][bc][dc][hc][ad][bd][dd][gd][ee][ge][he][af][bf][cf][df][ef][ff][dg][fg][gg][hg][ig][fh][gi]LB[ha:F][fd:D][ae:A][de:C][bi:E][hi:B]C[Black to move
A - 3
B - 5 + seki threat
C - 2
D - 1
E - seki or ko if B
F - 4.75 (ish)
So it seems like the progression should be something like
B,F, E, ...]PL[B]
;B[hi]
;W[ha]
;B[ae]
(;W[bi]
;B[de]
;W[fd]
;B[ic]
;W[fa]
;B[ia]
;W[ga]
;B[]
;W[]TW[aa][ca][ea][fb][gb][dc][dd]TB[hd][id][ie][gf][hf][if][gh][hh][ih][ii]C[B+1])
(;W[de]
;B[bi]
;W[ci]
;B[ah]
;W[fd]
;B[ic]
;W[fa]
;B[ia]
;W[ga]
;B[]
;W[]TW[aa][ca][ea][fb][gb][dc][dd]TB[hd][id][ie][gf][hf][if][gh][hh][ih][ii]C[B+2]))[/sgf-full]
