(
;
FF[4]
GM[1]
SZ[19]
AP[Jago:Version 5.00]
AB[pq][pr][qr][qp][rp][po][pn][nq][rn]
AW[pp][op][oo][oq][or][qq][mp][kp][jq]
LB[os:a]
C[What is white's best way to prevent black from making the hane at 'a'?]
GN[goproblem_x03]
(
;
W[rr]
;
B[rq]
(
;
W[qs]
;
B[ps]
;
W[os]
;
B[rs]
C[RIGHT
White prevented black from making the hane at the marked stone in sente.]
TR[os]
)
(
;
W[ps]
;
B[qs]
;
W[os]
C[Gote.]
)
(
;
W[os]
LB[qs:a]
C[Black tenukis, then white plays at 'a', and black tenukis again. Black gains two moves elsewhere.]
)
)
(
;
W[ps]
;
B[qs]
;
W[os]
C[Gote.]
)
(
;
W[os]
LB[rr:a][rq:b][qs:c]
C[Black tenukis, then white plays at 'a', black 'b', white 'c', and black tenukis again. Black gains two moves elsewhere.]
)
(
;
W[qs]
;
B[rr]
LB[os:a]
C[Now white can't prevent black from making the hane at 'a' in sente.]
)
(
;
W[rq]
;
B[rr]
C[Now white can't prevent black from making the hane at 'a' in sente.]
LB[os:a]
)
)