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Offline tchan001
 Post subject: Two wholeboard endgame problems
Post #1 Posted: Thu Mar 10, 2011 3:28 am 
Gosei
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Just a couple 9X9 wholeboard endgame problems I shared earlier in the KGS L19x19.com room. Have fun.




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Offline emeraldemon
 Post subject: Re: Two wholeboard endgame problems
Post #2 Posted: Thu Mar 10, 2011 2:54 pm 
Gosei
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KGS: greendemon
Tygem: greendemon
DGS: smaragdaemon
OGS: emeraldemon
[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]
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Offline tchan001
 Post subject: Re: Two wholeboard endgame problems
Post #3 Posted: Thu Mar 10, 2011 5:54 pm 
Gosei
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Good job :tmbup:

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A blog on Asian go books, go sightings, and interesting tidbits
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Offline Tsuyoku
 Post subject: Re: Two wholeboard endgame problems
Post #4 Posted: Fri Mar 11, 2011 5:33 am 
Dies in gote

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Nice ones.

Each one needs precise counting to get the right answer.
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