(;GM[1]FF[4]CA[UTF-8]AP[CGoban:3]ST[2]
RU[Japanese]SZ[19]KM[0.00]
MULTIGOGM[1]
;B[pd]
;AW[rb][kc][nc][qf][pj][qn]AB[pc][pg][qh][qp][pq]LB[rb:3][qf:1][pg:2]C[This will be our topic.
These white moves, 1 and 3, are unusual moves, but sometimes possible. ]
;AE[rb][qf][pg][pj]AW[qj][pl]SQ[qj]C[We start with this position, where it is important to note that the marked stone is low. ]
(;AE[qj][pl]AW[qf][pj]AB[pg]SQ[pj]C[In this situation the white stone is high, on the fourth line.]
(;AE[qf][pg]
(;
(;
(;
(;
;W[qf]
;B[pg]
;W[rb]
;B[qc]C[If black has enough ko threats, this is the best answer.]
;W[rc]
;B[rd]
;W[re]
;B[sd]
;W[pe]
;B[oe]
;W[qd]C[White starts a ko.])
(;W[qf]
;B[pg]
;W[rb]
;B[qd]
;W[qc]C[Fantastic tesuji to make miai!]
;B[pb]
;W[rd]
;B[qb]
;W[rc]
;B[qe]
;W[re]
;B[rg]
;W[rf]
;B[pf]
;W[ra]C[White lives, a disaster for black.]))
(;W[qf]
;B[pg]
;W[rb]
;B[rd]
;W[qc]
;B[qd]
;W[pb]C[A similar result to the previous diagram.]))
(;W[qf]
;B[pg]
;W[rb]
;B[rc]C[This move is even worse.]
;W[qb]
(;B[qc]
;W[pb]LB[oe:A][of:B][qi:C][ri:D]C[White has destroyed a big deal of black's corner. On top of that white has many forcing moves. White can choose between A-D. ]
;W[oe]
;B[pe]
;W[of]
;B[pf]
;W[ri]
;B[rh]C[Black cries.])
(;B[pb]
;W[qc]
;B[qd]
;W[rd]
;B[re]
;W[sc]C[This is impossible. ])))
(;W[qf]
;B[pg]
;W[rb]SQ[pj]C[Therefore when white has a high stone on the right, he can strike on 2-2 point! 

Note that white needs enough ko threats to play here.]
;B[qb]
;W[qd]
;B[rc]
;W[qc]LB[pb:A][rd:C][pe:B]C[It is difficult for black to manage the situation. Black is busy with his weaknesses A, B and C.]))
(;W[pf]
;B[of]
;W[rh]C[In this case white does not want to play here. ]
;B[ri]
;W[rg]
;B[qj]C[This is painful for white's right side.]
;W[oe]
;B[og]C[black can live in the corner and white is too damaged on the right side.]))
(;W[qf]
;B[pg]
;W[pf]
;B[of]
;W[rh]
;B[ri]
;W[rg]
;B[qi]
;W[rj]
;B[si]
;W[rd]SQ[qj]C[White can live with this sequence when the white squared stone is low. ]
;B[rc]
;W[re]
;B[og]
;W[qd]
;B[qc]
;W[pe]))