(;GM[1]
FF[4]
AP[Hibiscus:2.1]
SZ[19]
ST[3]
;AB[bg][ce][cf][cg][ch][cj][ck][eb][ej][fc][fd][fe][ff][fj][gg][gh][if][kf][md][me][mf][ob][oc][od][pa][qb]
AW[be][bf][cd][dc][dg][dh][di][ed][ee][ef][fh][hc][id][kd][ld][mc][na][nb][nc][oa]
PL[W]
C[White to make the best endgame move here]
(;W[cb]
C[RIGHT]
)(;W[db]
;B[da]
;W[ca]
;B[fa]
LB[fa:5][ib:A][cb:B]C[And black can aim at both A and B.]
)(;W[da]
C[Wrong! as black has a very big ko
threat now. Besides white has bad aji.]
)(;W[gb]
;B[cb]
;W[db]
;B[da]
;W[bb]
;B[bc]
;W[cc]
;B[ba]
C[White's group is ko.]
))