Go (Baduk, Weiqi) problems with solutions

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Direction of play and tesuji problem 013

13 Black to play. Black has three moves in which to capture the corner. Will they be in time?

(;
GM[1]FF[4]VW[]AP[goproblems.ru]
SZ[19]
AB[bo][cp][cq][dr][eq]
AW[bq][bp][cr][cs][cn]
C[13
Black to play
Black has three moves in which to capture the corner. Will they be in time?]
(;B[ap]
TE[1]C[Correct answer
See the continuation]
;W[ar];B[ao]
(;W[co]
C[See the variation]
;B[br];W[bs];B[aq]
C[…Black is in time, and no special tricks are needed here.]
LB[aq:7][bs:6][co:4][ao:3][ar:2][ap:1]
)
(;W[aq];B[bs];W[co];B[br]
C[…Another simple line that brings Black victory.]
LB[br:7][co:6][bs:5][aq:4][ao:3][ar:2][ap:1]
))
(;B[co]
BM[1]C[Wrong answer
See the continuation]
;W[ar]
C[…After the connection 1 White lives.]
LB[ar:2][co:1]
))

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