Go (Baduk, Weiqi) problems with solutions

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Refuting a trick play (hamete) problem 045

45 Black to play. The marked stone may turn out to be a tesuji or an overplay. Everything depends on Black’s next move.

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][qo][pp]
AW[qq][qp][qn][kp]
;W[tt]C[45
Black to play
The marked stone may turn out to be a tesuji or an overplay. Everything depends on Black’s next move.]
TR[qn]
(;B[po]
TE[1]C[Correct answer
Black should play 1, even though it may look passive.
See the continuation]
;W[ro];B[rn]
(;W[rm]
C[See the variation]
;B[rp];W[sn];B[rq]
C[… Black then cuts severely at 3. In the end Black makes a big profit in the corner.]
LB[rq:7][sn:6][rp:5][rm:4][ro:2][po:1]
)
(;W[rp];B[qm];W[rr];B[pn]
C[…White 4 is slow. Black makes a fine shape with 5 and 7.]
LB[pn:7][rr:6][qm:5][rp:4][rn:3][ro:2][po:1]
))
(;B[ro]
BM[1]C[Wrong answer
In principle Black 1 is also playable.
See the continuation]
;W[po];B[rn];W[oo];B[pq];W[qr];B[rp];W[nq]
C[…But when White cuts at 2 and extends with 4, the position reverts to the usual joseki with 8. Black has missed a good opportunity.]
LB[nq:8][rp:7][qr:6][pq:5][oo:4][rn:3][po:2][ro:1]
))

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