Go (Baduk, Weiqi) problems with solutions

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Direction of play and tesuji problem 012

12 Black to play. This joseki occurs so often that you have to know by heart how to answer /\\.

(;
GM[1]FF[4]VW[]AP[goproblems.ru]
SZ[19]
AB[cr][dq][er][cm][cj]
AW[cq][cp][do][en][fq]
C[12
Black to play
This joseki occurs so often that you have to know by heart how to answer /\\.]
TR[fq]
(;B[gq]
TE[1]C[Correct answer
Tsuke 1 is the right suji.
See the continuation]
(;W[gp]
C[See the variation]
;B[gr]
(;W[hp]
C[See the variation]
;B[iq]
C[…After 5 Black makes shape.]
LB[iq:5][hp:4][gr:3][gp:2][gq:1]
)
(;W[hq];B[hp]
C[…If White sharpens the play with 4, Black joins the fight with 5.]
LB[hp:5][hq:4][gr:3][gp:2][gq:1]
))
(;W[fr];B[gr];W[es];B[ds];W[fs];B[fp];W[eq];B[ep];W[dr]
C[…Why does White not break through with 2? A forced continuation up to 10 follows, leading to a ko fight. Black gives up the ko in exchange for two big moves in a row, and can be quite satisfied with that.]
LB[dr:10][ep:9][eq:8][fp:7][fs:6][ds:5][es:4][gr:3][fr:2][gq:1]
))
(;B[fp]
BM[1]C[Wrong answer
This tsuke 1 may look full of fighting spirit, but it is wrong.
See the continuation]
;W[eq];B[ep];W[dp];B[dr];W[gq];B[gp];W[hq]
C[…Fighting is twice as hard for Black, since they have two weak groups against White’s one.]
LB[hq:8][gp:7][gq:6][dr:5][dp:4][ep:3][eq:2][fp:1]
)
(;B[fr]
BM[1]C[Wrong answer
See the continuation]
;W[gq];B[gr];W[hq]
C[…Of course, being so obliging gets Black nowhere. White has gained good thickness.]
LB[hq:4][gr:3][gq:2][fr:1]
))

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