Go (Baduk, Weiqi) problems with solutions

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Refuting a trick play (hamete) problem 017

17 Black to play. White has just played the marked move. What is White aiming at?

If the variation letters A, B and C are not shown on the board, reload the page or press "next move".

(;
GM[1]FF[4]VW[]AP[goproblems.ru]
SZ[19]
AB[oq][np]
AW[qp][lq][oo]
;W[tt]C[17
Black to play
White has just played the marked move. What is White aiming at?]
TR[oo]
(;B[qr]
TE[1]C[Correct answer
The best answer is Black 1.
See the continuation]
(;W[pl]
C[See the variation
…The move 2 makes the proper shape on the right side, but in this variation the position on the right is worse for White than in the standard joseki.]
LB[pl:2][qr:1]
)
(;W[mo];B[no];W[nn];B[mp];W[lp];B[on]
C[…If White tries to enclose Black with 2, Black pushes through with 3 and 5 and then cuts at 7. White’s attempt ends in disaster.]
LB[on:7][lp:6][mp:5][nn:4][no:3][mo:2][qr:1]
))
(;B[no]
BM[1]C[Wrong answer
See the continuation]
;W[on];B[lo];W[jp]
C[…Black makes good shape with 1 and 3, but in this position there is no need to force a way out. White profits on both sides with 2 and 4.]
LB[jp:4][lo:3][on:2][no:1]
))

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