Go (Baduk, Weiqi) problems with solutions

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Direction of play and tesuji problem 010

10 Black to play How to connect your stones?

(;
GM[1]FF[4]VW[]AP[goproblems.ru]
SZ[19]
AB[bo][co][dp][dq][fq][fr][gp]
AW[cr][bp][cp][er][hq][cm][dn][do]
C[10
Black to play
How to connect your stones?]
;B[cq]
TE[1]C[Correct answer
See the continuation]
;W[bq]
(;B[br]
C[See the variation]
;W[ar];B[bs];W[cs];B[ap];W[as];B[br];W[bs];B[ao]
;W[dr];B[aq]
C[…The combination starts simply, but the sacrifice 3-5 has to be known by heart.
The horikomi 9 and the connection 11 have a name of their own: the "tombstone" squeeze (shibori). Black wins the semeai by one move.]
LB[aq:13][dr:12][ao:11][as:8][ap:7][cs:6][bs:10][ar:4][bq:2][cq:1]
)
(;B[dr]
BM[1]C[Wrong continuation]
;W[br]
C[… Clearly Black has achieved nothing here.]
LB[br:4][dr:3][bq:2][cq:1]
))

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