Go (Baduk, Weiqi) problems with solutions

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Direction of play and tesuji problem 028

28 Black to play. The main action is on the lower side. If Black is forced to run there, the prospects are poor indeed.

(;
GM[1]FF[4]VW[]AP[goproblems.ru]
SZ[19]
AB[jq][ap][bo][co][cp][dp][eo][dn][dj]
AW[br][bq][bp][cq][fq][gp][pp][mq][cn]
C[28
Black to play
The main action is on the lower side. If Black is forced to run there, the prospects are poor indeed.]
;B[fr]
TE[1]C[Correct answer
See the continuation]
(;W[eq]
C[See the variations]
;B[gr];W[er];B[hq]
C[…The line 1-5 settles the stones on the lower side. Moreover, Black later has the threat of A, which takes the eyes away from the corner group.]
LB[es:A][hq:5][er:4][gr:3][eq:2][fr:1]
)
(;W[er];B[eq];W[dq];B[fp]
C[…This big ko is too dangerous for White.]
LB[fp:5][dq:4][eq:3][er:2][fr:1]
)
(;W[gr]
(;B[dr]
C[See the variation]
;W[er];B[dq]
C[…The outside block (osae) 2 leads to an exchange that favours Black. The stone on the lower side must now be treated lightly.]
LB[dq:5][er:4][dr:3][gr:2][fr:1]
)
(;B[eq]
BM[1]C[Wrong continuation]
;W[er];B[dr];W[fs];B[dq]
C[…After 6 White still has watari by means of the ko fight at A.]
LB[dq:7][fs:6][dr:5][er:4][eq:3][gr:2][ds:A]
)))

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