Go (Baduk, Weiqi) problems with solutions

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Direction of play and tesuji problem 002

2 Black to play White has cut through with 1 and 3. What is Black’s best way to settle matters on the left side?

(;
GM[1]FF[4]VW[]AP[goproblems.ru]
SZ[19]
AB[di][gq][hq][iq][fo][fp][cp][dp][eo]
AW[cq][dq][eq][fq][gr][hr][ep][do]
C[2
Black to play
White has cut through with 1 and 3. What is Black’s best way to settle matters on the left side?]
LB[ep:1][eo:2][do:3]
(;B[dn]
TE[1]C[Correct answer
See the continuation]
;W[co]
(;B[bp]
C[See the variation]
;W[bn];B[cn];W[bo];B[bm];W[bq];B[cl]
C[…Correct: the sacrifice 3! Kosumi 4 is the suji, and the affair ends with the left side closed off and good aji left behind. Black’s game from here should be easy.]
LB[cl:9][bq:8][bm:7][bo:6][cn:5][bn:4][bp:3][co:2][dn:1]
)
(;B[cn];W[bp]
C[…Without knowing the sacrifice, Black ends the line with bad aji: the hane at A, the invasion at B and finally the cut at C leave Black with their hands full.]
LB[en:C][cl:B][bn:A][bp:4][cn:3][co:2][dn:1]
))
(;B[co]
BM[1]C[Wrong answer
See the continuation]
;W[dn];B[cn];W[dm];B[cm]
C[…A mistake in the direction of play. After 4 Black can forget about a moyo in the centre.]
LB[cm:5][dm:4][cn:3][dn:2][co:1]
))

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