Go (Baduk, Weiqi) problems with solutions

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Direction of play and tesuji problem 019

19 Black to play It has to be said at once that 1, 3 is bad suji. How can Black bring that out?

(;
GM[1]FF[4]VW[]AP[goproblems.ru]
SZ[19]
AB[do][fp][eo]
AW[dq][ep][fq]
C[19
Black to play
It has to be said at once that 1, 3 is bad suji. How can Black bring that out?]
LB[fq:3][ep:1]
;B[gq]
TE[1]C[Correct answer
The double hane (nidan bane) 1 is a fierce attack.
See the continuation]
(;W[gr]
C[See the variation]
(;B[gp]
C[See the variation]
;W[hr];B[cq]
C[…After 5 it will not be easy for White to find a good move. For example, A is answered by B.]
LB[er:B][cr:A][cq:5][hr:4][gp:3][gr:2][gq:1]
)
(;B[hq];W[hr];B[iq];W[ir];B[jq];W[fo];B[gp];W[fn]
C[…Of course it would be nice to press White down to the second line, but this sequence allows the counter-attack 8, 10. The main line is better.]
LB[fn:10][gp:9][fo:8][jq:7][ir:6][iq:5][hr:4][hq:3][gr:2][gq:1]
))
(;W[gp];B[fo];W[hq];B[gr];W[hp];B[cq];W[fr];B[dr]
C[…If White cuts with 2, by move 9 Black captures a big corner.]
LB[dr:9][fr:8][cq:7][hp:6][gr:5][hq:4][fo:3][gp:2][gq:1]
))

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