Go (Baduk, Weiqi) problems with solutions

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Direction of play and tesuji problem 020

20 Black to play In answering the invasion 1, 3, Black must take the situation in the upper left corner into account.

(;
GM[1]FF[4]VW[]AP[goproblems.ru]
SZ[19]
AB[dp][jp][cm][dd][fd][cc][dq]
AW[cf][bd][ci][cq][cp]
C[20
Black to play
In answering the invasion 1, 3, Black must take the situation in the upper left corner into account.]
LB[dq:2][cp:3][cq:1]
(;B[cr]
TE[1]C[Correct solution
Black should play the hane from below 1.
See the continuation]
;W[cn];B[dn];W[do];B[eo];W[co];B[en];W[br];B[dr]
;W[bm];B[cl];W[bl]
C[…Note the correct choice of 7. The joseki move is A, but here, given the situation on the left side, this is exactly how Black must play.
After this line Black will take a big point somewhere, while White does well to connect on the left, strengthening their position.]
LB[dm:A][bl:12][cl:11][bm:10][dr:9][br:8][en:7][co:6][eo:5][do:4][dn:3][cn:2][cr:1]
)
(;B[co]
BM[1]C[Wrong answer
See the continuation]
;W[bo];B[bn];W[do];B[cn];W[dr];B[er];W[cr];B[fq]
;W[bp];B[eo]
C[…Also a joseki, but the result is worse than in the main line for two reasons. First, the sequence ends in gote for \
Black. Second, Black’s influence on the left side does not \
work at all, running into the three white stones.]
LB[eo:11][bp:10][fq:9][cr:8][er:7][dr:6][cn:5][do:4][bn:3][bo:2][co:1]
))

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