Go (Baduk, Weiqi) problems with solutions

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Direction of play and tesuji problem 001

1 Black to play White has answered the cut (kiri) 1 with 2. Black must play so as to leave useful aji.

(;
GM[1]FF[4]VW[]AP[goproblems.ru]
SZ[19]
AB[jp][dp][dq][do][co][bn][en][dk][dm]
AW[em][dn][cn][bo][cp][cq][bq][ap][cm]
C[1
Black to play
White has answered the cut (kiri) 1 with 2. Black must play so as to leave useful aji.]
LB[dm:1][cm:2]
(;B[bm]
TE[1]C[Correct answer
Sacrificing the second stone is joseki.
See the continuation]
;W[cl];B[dl]
(;W[bk]
C[See the variation]
;B[fn]
C[…Black now keeps various aji connected with playing stones at A, B, C, D, E or F.]
LB[ej:F][dj:E][cj:D][di:C][ci:B][ch:A][fn:5][bk:4][dl:3][cl:2][bm:1]
)
(;W[bl];B[bk]
C[…If White plays 4, Black immediately plays the tsuke 5 and blocks White off on the left.]
LB[bk:5][bl:4][dl:3][cl:2][bm:1]
))
(;B[dl]
BM[1]C[Wrong answer
See the continuation]
;W[bm];B[fn]
C[…No aji is left on the left.]
LB[fn:3][bm:2][dl:1]
))

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