Go (Baduk, Weiqi) problems with solutions

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Direction of play and tesuji problem 030

30 Black to play. A typical tsumego position. How should Black answer /\\?

(;
GM[1]FF[4]VW[]AP[goproblems.ru]
SZ[19]
AB[cq][cp][dp][dn][eo][fo][gp][gq][hr][gs][iq][br]
AW[cr][dq][er][fr][gr][fp][fq][bs]
C[30
Black to play
A typical tsumego position. How should Black answer /\\?]
TR[bs]
(;B[ds]
TE[1]C[Correct answer
Only the standard nakade 1 solves the problem, though Black must play the rest without a mistake.
See the continuation]
;W[cs];B[dr];W[es];B[dr]
(;W[ep]
C[See the variation]
;B[eq]
C[…White’s correct course is the ko fight.]
LB[eq:7][ep:6][es:4][dr:5][cs:2]
)
(;W[ds];B[ep];W[bq];B[ar]
C[…After the capture 6 the group dies unconditionally.]
LB[ar:9][bq:8][ep:7][es:4][cs:2][ds:6]
))
(;B[ar]
BM[1]C[Wrong answer
Sagari 1 is simple yose.
See the continuation]
;W[ep]
C[…Whatever the balance of ko threats on the board, this move is worse than the main line.]
LB[ep:2][ar:1]
))

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