Go (Baduk, Weiqi) problems with solutions

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Direction of play and tesuji problem 017

17 Black to play. White has invaded with /\\. It is important to answer this provocation decisively.

(;
GM[1]FF[4]VW[]AP[goproblems.ru]
SZ[19]
AB[dp][co][fp][dj][dd]
AW[cn][dn][dg]
C[17
Black to play
White has invaded with /\\. It is important to answer this provocation decisively.]
TR[dg]
(;B[dl]
TE[1]C[Correct answer
Of all the possibilities, the one-space jump (ikken tobi) 1 still comes first. The point is that after /\\ it was exactly the jump to 1 that would have given White shape. "Your opponent’s best move is your own move".
See the continuation]
TR[dg]
;W[fn];B[gk];W[hn];B[gm];W[gn];B[hp]
C[…Black continues 3-7 with excellent rhythm.]
LB[hp:7][gn:6][gm:5][hn:4][gk:3][fn:2][dl:1]
)
(;B[fn]
C[A possible answer
See the continuation]
;W[dl];B[fj];W[fl];B[hj]
C[…1-5 is not bad either, aiming at the /\\ stone. 1 can also be played at 3 or at A, but the main line is still stronger.]
LB[fd:A][hj:5][fl:4][fj:3][dl:2][fn:1]
TR[dg]
))

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