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Refuting a trick play (hamete) problem 029

29 Black to play. White tries to split Black with the marked move. How can Black take advantage of White’s mistake?

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][qq][no]
AW[qp][mp][pq][pn]
;W[tt]C[29
Black to play
White tries to split Black with the marked move. How can Black take advantage of White’s mistake?]
TR[pq]
(;B[pp]
TE[1]C[Correct answer
See the continuation]
;W[pr];B[qo]
(;W[rp]
C[See the variation]
;B[po];W[ro];B[qn];W[qr]
C[…Black plays the combination 1, 3 and 5, sacrificing the corner stone. Black’s influence after 8 is worth far more than White’s small corner.]
LB[qr:8][qn:7][ro:6][po:5][rp:4][qo:3][pr:2][pp:1]
)
(;W[op];B[po];W[np];B[oo];W[qr];B[rp]
C[…White can also answer 3 with 4. Black 5 is a good move that gives Black an excellent result.]
LB[rp:9][qr:8][oo:7][np:6][po:5][op:4][qo:3][pr:2][pp:1]
))
(;B[pr]
BM[1]C[Wrong answer
Black 1 is a weak move.
See the continuation]
;W[pp];B[rr];W[rq];B[qr];W[np];B[op];W[oo]
C[…White connects at 2 and Black’s shape is left too weak. White then splits Black with 6 and 8.]
LB[oo:8][op:7][np:6][qr:5][rq:4][rr:3][pp:2][pr:1]
))

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