Go (Baduk, Weiqi) problems with solutions

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Refuting a trick play (hamete) problem 049

49 Black to play White has played an unusual move. Should Black defend, or counter-attack at once?

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(;
GM[1]FF[4]VW[]AP[goproblems.ru]
SZ[19]
AB[qq][qp][oq][or]
AW[nq][op][pp][pn]
;W[tt]C[49
Black to play
White has played an unusual move. Should Black defend, or counter-attack at once?]
(;B[np]
TE[1]C[Correct answer
The severe cut at 1 splits White into two weak groups.
See the continuation]
;W[mq];B[no]
(;W[kp]
C[See the variation]
;B[on];W[qo];B[pl]
C[…Black takes the vital point 5 and encloses with 7. White is in for a hard time.]
LB[pl:7][qo:6][on:5][kp:4][no:3][mq:2][np:1]
)
(;W[on];B[kp]
C[…If White defends with 4, Black switches to attacking the lower group with 5.]
LB[kp:5][on:4][no:3][mq:2][np:1]
))
(;B[qo]
BM[1]C[Wrong answer
Black 1 is a mistake.
See the continuation]
;W[nn]
C[…White connects at 2. Black has missed a good opportunity.]
LB[nn:2][qo:1]
))

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