(;GM[1]FF[4]CA[UTF-8]AP[CGoban:3]ST[2]
RU[Japanese]SZ[19]KM[0.00]
PW[백 Cho Hye Yeon 9p]PB[badukmovies]C[Today's topic: The attachment in the corner. For example: 
]
(;B[qd]
;W[pp]
;B[od]
;W[dp]
;B[jc]
;W[jp]
;B[qj]
;W[qc]C[Attachment!
]
(;B[pc]
;W[qe]
(;B[rd]
;W[pe]
;B[pd]
;W[ph]
;B[oi]
;W[ng]C[One of the sequences!
])
(;B[rc]C[This move is also possible.
]
;W[rd]
;B[qb]
;W[ph]
;B[oi]
;W[ng]C[One of the variations!
]))
(;B[re]C[This move is powerful! Later...
]
(;W[rd]
(;B[pd]
;W[rb]C[The potential(aji).
])
(;B[rc]
;W[pd]
;B[sd]
;W[pe]
;B[pc]
;W[oc]
;B[qb]
;W[nd]C[White succeeds!
]))
(;W[ob]C[It depends on ...

]
;B[rc]
;W[mc]C[A difficult fight!
]))
(;B[rd]
;W[pc]
;B[oc]
;W[pd]
;B[pe]
;W[ob]C[We can expect the following sequence.
]
;B[nb]
;W[rc]
;B[qf]
;W[oa]
;B[sc]
;W[sb]
;B[ra]
;W[qa]
;B[qb]
;W[pb]LB[nc:A]C[A bad potential (aji)
]))
(;B[qp]
;W[qj]
;B[op]
;W[qm]
;B[mq]
;W[jq]
;B[dq]
;W[qq]C[This attachment!
]
(;B[pq]
;W[rp]
(;B[rq]
;W[qo]
;B[qr]C[White wants this diagram.
])
(;B[qo]C[This move is better for black.
]
(;W[ro]
;B[rq]
;W[qn]C[One of the diagrams
])
(;W[qr]
;B[ro]
;W[sq]
(;B[sp]C[Wow!
]
;W[so]
;B[sn]
(;W[rs]
;B[ps]
;W[sr]
;B[sp]
;W[rq]C[Black is satisfied with it.
]
;B[rk]C[Black can jump further, there is more aji in white's base.])
(;W[sp]C[White can't connect]
;B[sr]
;W[rq]
;B[rm]C[White is dead in the corner]))
(;B[so]LB[sp:A]C[This is also blacks sente, but playing at A is better]
;W[rs]
;B[rl]C[Now black can jump to here, but he could have done better]))))
(;B[rp]C[If black plays here,
]
;W[or]C[Aji
]
(;B[oq]
;W[nr]
;B[mr]
;W[pq]
;B[rr]
;W[nq]
;B[np]
;W[mp]C[Aji! 
])
(;B[nr]
;W[oq]
;B[np]
;W[rq]C[White can make life in the corner.
])
(;B[nq]
;W[pq]
;B[rq]
;W[rr]
;B[sr]
;W[qs]C[White can make a ko at least]
;B[nr]C[When black simply tries to kill]
;W[pp]
;B[po]
;W[ss]C[There is a ko here]
;B[sq]C[Connecting here is not recommended]
;W[qo]C[White can cut and the ko is even bigger now]))
(;B[rq]C[If black plays here...
]
(;W[pq]
;B[ro]C[What black wants! 
]
;W[nr]
;B[mr]
;W[nq]
;B[np]
;W[mp]
;B[kq]C[A difficult fight, but black is not bad.
])
(;W[qo]
;B[pp]
;W[ro]C[Later on, white can play in this way.
]
;B[]
;W[rp]C[This is endgame for white]
(;B[qr]
;W[sq]
;B[rr])
(;B[rr]C[Looks clever, but is not good]
;W[qr]
;B[pr]
;W[sr]
(;B[qs]
;W[sq]C[White destroys the corner points in sente]
;B[pq])
(;B[sq]C[However black can fight the ko when he has more threats. ]
;W[rs]))))
(;B[ro]C[This move is also possible.
]
;W[or]
;B[pq]
;W[nq]
;B[np]
;W[mr]SQ[jq]C[It depends on the situation. Now the marked stone helps a lot
])))