Go (Baduk, Weiqi) problems with solutions

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Direction of play and tesuji problem 015

15 Black to play. Black’s eye space looks wide, but the placement (oki) /\\ causes serious trouble.

(;
GM[1]FF[4]VW[]AP[goproblems.ru]
SZ[19]
ST[2]
AB[bp][cp][dp][dq][dr][co]
AW[ar][er][eq][eo][ep][do][bo][bn][cn][gr]
C[15
Black to play
Black’s eye space looks wide, but the placement (oki) /\\ causes serious trouble.]
TR[ar]
(;B[ap]
TE[1]C[Correct answer
Sagari 1 is correct.
See the continuation]
(;W[cr]
C[See the variation]
;B[bs];W[cs];B[br];W[bq];B[cq];W[as]
(;B[br];W[ds];B[aq]
C[…After a bland opening the adventures begin. When you reach the end of this beautiful combination, play it through again (if you did not know it).]
LB[ap:1][cr:2][cs:4][br:9][cq:7][as:8][ds:10][aq:11]
)
(;B[aq];W[ds];B[br]))
(;W[br];B[cr]
(;W[bq]
C[See the variation]
;B[bs];W[ds];B[aq]
C[…In this line Black also lives, but in seki.]
LB[ap:1][br:2][cr:3][bq:4][bs:5][ds:6][aq:7]
)
(;W[bs];B[bq]
C[…White loses the semeai by one move.]
LB[ap:1][br:2][cr:3][bs:4][bq:5]
)))
(;B[bq]
BM[1]C[Wrong answer
See the continuation]
;W[cr];B[bs];W[cs];B[ds];W[br];B[aq];W[es]
C[…If Black plays the magari 1, they lose the "eye versus no eye" fight.]
LB[bq:1][cr:2][bs:3][cs:4][ds:5][br:6][aq:7][es:8]
))

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