Go (Baduk, Weiqi) problems with solutions

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Direction of play and tesuji problem 004

4 Black to play 1, 3 were played with transparent intentions. If Black fails to make eyes, it will be a downright tragedy…

(;
GM[1]FF[4]VW[]AP[goproblems.ru]
SZ[19]
AB[bp][co][dn][do][dp][dq][fo][fp][ap]
AW[eq][fq][gp][hq][en][dm][fm][cn][bn][bo][bq][cq]
C[4
Black to play
1, 3 were played with transparent intentions. If Black fails to make eyes, it will be a downright tragedy…]
LB[bq:1][cq:3][ap:2]
(;B[br]
TE[1]C[Correct answer
Tsuke 1 gets Black out of trouble.
See the continuation]
;W[cr];B[dr];W[ds]
(;B[bs]
C[See the variation]
;W[cs];B[er]
C[…The cunning turn 4 is interesting here, but the cool-headed 5 puts a stop to the attempt. White cannot play at A in any way.]
LB[cp:A][er:7][cs:6][bs:5][ds:4][dr:3][cr:2][br:1]
)
(;B[er];W[ar];B[bs];W[cp]
C[…This line shows up the trap White has prepared. The naive 5 lets White live.]
LB[cp:8][bs:7][ar:6][er:5][ds:4][dr:3][cr:2][br:1]
))
(;B[cp]
BM[1]C[Wrong answer
If Black had not captured the white stones, they would have been in danger of dying themselves.
See the continuation]
;W[dr];B[gn];W[hm]
C[…After White 4 there is no escape from the corner.]
LB[hm:4][gn:3][dr:2][cp:1]
))

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