Go (Baduk, Weiqi) problems with solutions

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Direction of play problem 066

66 Black to play Choose from options A–B * White’s stones on the lower side are high

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(;
GM[1]FF[4]VW[]AP[goproblems.ru]
SZ[19]
ST[1]
AB[cd][hd][qd][oc]
AW[ed][pp][dp][dg]
;W[tt]C[66
Black to play
Choose from options A–B
* White’s stones on the lower side are high]
LB[ef:B][ee:A]
(;B[ee]
TE[1]C[Correct answer
The tsuke takes half the corner
See the continuation]
;W[fe];B[ef];W[dd];B[cf];W[cc];B[ce];W[ff];B[eg]
;W[db];B[cl]
C[…Black splits White’s forces with the standard move 1. After White 10 Black can simply extend to A, but then White still has the good move B.]
LB[cm:B][ck:A][cl:11][db:10][eg:9][ff:8][ce:7][cc:6][cf:5][dd:4][ef:3][fe:2][ee:1]
)
(;B[ef]
BM[1]C[Wrong answer
The double kosumi variation loses territory
See the continuation]
;W[de];B[df];W[ce];B[cf];W[bf];B[bd];W[be];B[cg]
;W[cc];B[fd];W[fc];B[ec];W[dc];B[ee];W[eb];B[dd];W[ec];B[bg]
;W[bc]
C[…Against Black 1 White splits with 2 and Black pushes at 3 — the natural sequence for both sides. When the joseki finishes with 20, White’s high /\\ stones neutralise Black’s influence.
If instead of 16 White connects at 17, Black seizes sente with A.]
LB[gc:A][bc:20][bg:19][dd:17][eb:16][ee:15][dc:14][ec:18][fc:12][fd:11][cc:10][cg:9][be:8][bd:7][bf:6][cf:5][ce:4][df:3][de:2][ef:1]
TR[pp][dp]
))

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