(;GM[1]FF[4]CA[UTF-8]AP[CGoban:3]ST[2]
RU[Japanese]SZ[19]KM[0.00]

;AB[mc][pd][qj]
(;W[qd]LB[qc:A][qe:B]C[Black has two answers at A and B.]
(;B[qc]LB[pc:B][rc:C][qe:A]C[Black takes territory.

White can play A, B and C.]
(;W[qe]C[Normally played.]
;B[rc]
(;W[pe]
;B[od]
;W[qh]C[even])
(;W[of]C[white also can play this move]
(;B[od]LB[qg:B][qh:A]C[white has two choices, depending on the surroundings. 

]
(;AB[qm][qp]SQ[qj][qm][qp]C[Here black is strong on the lower right. ]
(;W[qh]C[This jump is risky. ]
;B[pg]C[Painful.])
(;W[qg]C[With the black strength nearby, this is a better move]))
(;AW[qo][pq]AB[qm]SQ[qj][qm]C[Here the black group is not so strong.]
;W[qh]C[In this case, jumping here is possible, to attack black.]
;B[oj]
;W[oh]C[Peaceful.]))
(;B[qg]C[also black can play this move to make some infulence in the upper side]
;W[od]
;B[pe]
;W[pf]
;B[oe]
;W[ne]
;B[pc]
;W[qf]
;B[nf]
;W[qh])))
(;W[pc]C[This is not played often.]
(;B[od]
;W[rc]
;B[qb]
;W[qe]
;B[rb]
;W[qh]C[After this...]
;AW[jc][rd]LB[rd:A]SQ[jc]C[If white has a stone at the marked point, and also gets to connect at A...]
;W[nb]C[There is endgame aji.]
(;B[mb]C[If black blocks, he will be in trouble.]
;W[pb]C[The three black stones are in trouble.])
(;B[nc]C[So black will need to do something else.]
;W[ob]
;B[pb]
;W[mb]C[However, now white can destroy some territory. And destroy blacks eyes.]))
(;B[oc]C[Black can also answer here.]
;W[pb]
(;B[rc]
;W[rd]
;B[ob]
;W[pe]
;B[od]
;W[qh]C[Possible.])
(;B[qb]
;W[qe]
;B[od]
;W[qh]C[later, if white has ko threats...]
;W[rc]
;B[rb]
;W[sb]C[White can play this double hane.]
(;B[rd]
(;W[sd]C[Do you know this ko? 

Nice one eh? But white has an even better ko.])
(;W[ra]C[Bam! This ko threatens the whole corner. ]))
(;B[ob]C[If black chickens out (or doesn't have enough ko threats), white played nice endgame.]))))
(;W[rc]C[Possible if white needs territory.]
;B[qe]
;W[rd]
;B[pc]
;W[re]
;B[qf]
;W[rf]
;B[qg]
;W[qb]
;B[pb]
;W[rb]C[White lives in the corner.
But black gets strength on the outside.]))
(;B[qe]C[Black plays here if he wants influence.]
;W[re]
(;B[pe]LB[rc:B][rd:A]C[At this point, white can choose: A or B. 

Do you know the difference?

]
(;W[rd]C[This is normal.]
;B[rf]
;W[pc]
;B[oc]
;W[pb]C[This concludes the joseki. Black can play tenuki.]
;B[qg]C[If black is strong on the outside..]
;B[rb]C[He can make a ko.]
;W[rc]
;B[qb]
;W[sb]
;B[ra]
;W[qc]
;B[se]
;W[sd]
;B[pa]
;W[ob]
;B[nb]
;W[oa]
;B[sf]C[A two step ko.])
(;W[rc]C[If white has the ladder, this move is better!]
;B[rf]
;W[pc]
(;B[oc]C[Looks normal, but not good.]
;W[ob]C[What a great move! Nice! Wow, this is surprising. Wow.]
;B[pb]
;W[qc]
(;B[nb]C[Overplay. Wow.]
;W[od]
;B[oa]
;W[qf]C[White can cut! Wow! This is the ladder..]
;B[rg]
;W[qg]
;B[qh]
;W[oe]
;B[pf]
;W[pg]
;B[of]
;W[ph]LB[nf:B][rh:A]C[This move makes miai of A and B. ]
;B[qi]C[If black defends..]
;W[nf]
;B[og]
;W[oh]C[This is the ladder.])
(;B[nc]C[Proper move if white has the ladder.]
;W[qb]C[White lives perfectly. ]
;B[se]C[Note that if black plays here at this moment, it will be gote.
White tenukis.]))
(;B[se]C[Black needs to play atari, this is good timing. ]
(;W[oc]C[Overplay.]
;B[rd]
;W[nd]
;B[md]
;W[ne]
;B[qc]
;W[qb]
;B[lf]C[White will under attack.])
(;W[rd]C[The proper move.]
;B[oc]
;W[ob]
;B[pb]
;W[qc]
;B[nc]
;W[qb]
;B[nb]
;W[pa]LB[rd:C][se:B][qf:A]C[White will be satisfied with the weakness at A.

In the previous variation, black did not get to play the exchange of B for C.
So black is happy to have gotten this move in sente. ]))))
(;B[qc]C[Black can also play this way.]
;W[rd]
;B[pe]
;W[rc]
;B[qb]
(;W[qf]
;B[rg]C[Black can attack, but it's difficult to capture white. ]
;W[rf]
(;B[qh]C[A bit too much.]
;W[rb]LB[pc:A]C[Black has a weak point at A.])
(;B[rb]C[it is better to attack this way]
;W[pf]C[Anyway white can escape]))
(;W[qg]C[Not so good. This move will be attacked severely.]
;B[rh]C[Wow.]
;W[rg]
(;B[og]C[Possible.])
(;B[qh]C[Also possible.]
;W[pg]
;B[ng])))))
(;W[qc]C[White can consider invading at san-san]
;B[qd]
;W[pc]
;B[oc]
;W[ob]
;B[nb]
;W[od]
;B[nc]
;W[rd]
;B[re]
;W[rc]
;B[qf]
;W[pb]
;B[oe]C[A joseki, but black is very thick outside.

This is possible, however, white might prefer something else.]))
