(;GM[1]FF[4]CA[UTF-8]AP[CGoban:3]ST[2]
RU[Japanese]SZ[19]KM[0.00]
PW[Baduk]PB[Movies]
(;AW[nc][jd]AB[pd][pf][pj]C[A common shape.]
;W[ph]C[When white invades, how should black respond?]
(;B[qh]C[Attaching to a weak stone is bad. Because it will make the weak stone stronger.]
;W[qg]
;B[pg]
;W[qi]
(;B[oh]
;W[rh]
;B[pi]C[Eventhough black connects, it is bad for black.])
(;B[rh]C[When black extends here instead, white is very happy to connect.]
;W[pi]LB[pj:A]C[The stone at A has become very weak.]
;B[rg]
;W[oj]C[Good for white. Black lost more than he gained.]))
(;B[oh]C[Attaching at the top is also wrong.]
;W[og]
;B[pg]
;W[oi]
;B[qh]
;W[nh]LB[qi:A]C[The ponnuki is equivalent to 30 points.

There is still potential trouble for black at A.]
;B[pi]C[So black feels obliged to defend.]
;W[ne]C[Now white can jump here. White's thickness is harmonized and all connected.])
(;B[nj]C[Black should not touch white's stone. What about this jump?]
;W[nh]C[It's a bit too easy for white.]
;B[li]C[It is not easy for black to attack these white stones.]
;W[lh]LB[nc:B][jd:A]C[White can play here and has reinforcements at the top at A and B. Also, black's corner becomes weaker like this.])
(;B[nf]C[Jumping on the other sides leaves the same jump for white.]
;W[nh]C[Black does not gain. Good for white.])
(;B[oi]C[The diagonal move is the keypoint of attacking.]
;W[oh]
;B[nh]C[Black hits the head of white's 2 stones.]
(;W[ng]C[White can't play hane.]
;B[og]C[When black cuts, white is in trouble.])
(;W[of]C[Same goes for this move. Black can cut.]
;B[og]
;W[pg]
;B[ng]
;W[pe]
;B[qf]
;W[qe]C[White can't play here.]
;B[oe]
;W[nf]
;B[re]C[Black captures everything.])
(;W[og]C[White has no choice and has to play the empty triangle.
Black feels good. What is the next key move for black?]
(;B[nf]C[Making a net does not work.]
;W[ng]
;B[mg]
;W[mh]
;B[ni]
;W[mf]
;B[lg]
;W[of]
;B[ne]
;W[oe]
;B[od]
;W[nd]
;B[me]
;W[lf]LB[me:1][ne:2][nf:3]C[Black is in trouble. His 3 stones will die.])
(;B[ng]C[Simply pushing is wrong too.]
;W[of]
;B[oe]
;W[nf]
;B[ne]
;W[mf]C[White simply comes out.])
(;B[nd]C[Black should attach here! The second key move for attacking. A leaning attack.]
(;W[md]
;B[me]C[Black can double hane now.]
;W[ld]
;B[nf]C[When black makes the tiger's mouth now, he has no weak points any more.]
;W[ng]
;B[mg]
;W[qj]C[Even if white can make two eyes, it's good for black.]
;B[qk]
;W[qi]
;B[pk]LB[oc:A]C[It's still not easy to live for white. 
Black gained great thickness on the outside. Playing at A later is also very big for black to take the corner.])
(;W[ng]C[If white goes out here, black can take the one stone of white at the top.]
;B[mc]SQ[ng][og][oh][ph]C[It's enough for black.

White's marked stones still need to run away and are heavy.])))))
(;AW[co]AB[jp][dq]
;B[dk]C[In this situation, black pincers. Normally white should answer this move, but in the example white plays tenuki and plays somewhere else.
Now it is up to black to attack white: what's black's key move?]
;W[]C[White tenukis.]
(;B[ep]C[This move is too gentle.]
;W[bq]
;B[dn]
;W[cn]
;B[dm]C[White settles in the corner too easily. Good for white.])
(;B[do]C[This attachment makes it too easy for white to settle as well.]
;W[dn]
;B[eo]
;W[cp]
;B[cq]
;W[cm]LB[bk:B][fm:A]C[White makes miai of coming out at A or making a base at B. Suboptimal for black.])
(;B[cm]C[What about this pincer? It feels a bit narrow.]
(;W[eo]C[If white jumps, it's ok for black.]
;B[fp]C[White has no base yet. Black is happy.])
(;W[dp]C[However, white will play this move.]
(;B[eq]C[Black needs to come out and white makes eyes in the corner.]
;W[cq]
;B[cr]
;W[bq]C[Too easy for white.]
;B[gp]C[Black still has a hole at the bottom, so white might even get sente.])
(;B[cq]C[When black plays the corner, white can jump away lightly.]
;W[fp]
;B[eq]
;W[fm]C[A great sabaki.]
;B[gq]C[White can get sente again.])))
(;B[cp]C[In this case, this attachment is the key move!]
;W[do]C[White has to come out and prevent a tiger's mouth for black.]
;B[fp]
(;W[cm]LB[dk:A]C[Because of  black's stone at A, white can only jump closely. And black can attack white further.]
;B[cl]
;W[dm]C[White is very overconcentrated.]
;B[fk]C[White is not alive yet.])
(;W[dm]C[If white plays high, black still plays the kosumi to take white's eyes away.]
;B[cl]
;W[gn]
;B[hp]C[Black gains territory on both sides. White is not alive yet. Good for black.])))
(;AW[pb][qb][nc][qc][qd][qf][qg]AB[ob][oc][pc][id][nd][pd][pe][pg][ph][pk]
;W[kd]C[White invades into black's powerful thickness. How should black attack?]
(;B[le]C[Playing here is playing from the wrong side.]
;W[ke]
;B[lf]
;W[kf]
;B[lg]C[We can not call this an attack. Black makes territory with his wall. White comes out easily.]
;W[if]C[Black is overconcentrated.])
(;B[ke]C[Don't attach to weak stones! This will make white stronger.]
;W[le]
;B[je]
;W[lf]C[White can even extend here.]
;B[ld]C[Cutting like this would be a big mistake for black.]
;W[md]C[White can still go through.]
;B[lc]
;W[mc]
;B[lb]
;W[ne]SQ[ob][oc][pc][pd][pe]C[White now feels stronger than black's marked stones. White won't be attacked so easily anymore.])
(;B[kf]LB[gc:A]C[This capping move is a good move, it's a way to play if you wish to create territory around A]
;W[je]
;B[ig]
;W[ie]
;B[gd]C[Black is strengthening the top and the centre whilst attacking.])
(;B[jf]C[You can also attack with the knight's move. This is the key move for attacking!
There is a go proverb: when you attack, attack with the knight's move!]
(;W[kf]
;B[kg]
;W[lf]
;B[jg]
;W[lg]
;B[lh]C[White feels in danger.]
;W[mh]
;B[mg])
(;W[lf]
;B[kh]LB[le:A]C[Black is one step faster than white.
White is also quite thin at A.
Black makes full use of his thickness.])))
(;AW[gp][eq][fq]AB[dn][fo][dp][fp][dq]C[In this shape, a joseki that comes forth from a black 4-4 stone, white usually comes back at the lower side to defend.

In this example however, white plays tenuki.]
(;W[jq]C[This is one way of playing.])
(;W[hq]C[Sometimes white can connect very solidly like this too.])
(;W[]C[White plays somewhere else on the board. How should black attack white, and punish?]
(;B[gq]C[Cutting does not work.]
;W[hq]
;B[gr]
;W[hr]C[Black is captured.])
(;B[hq]C[Peeping makes white stronger. A bad move too.]
;W[gq]C[When white connects, black's one stone seems quite weak.])
(;B[go]C[Pushing is the worst move in this shape.]
;W[hp]
;B[ho]
;W[ip]
;B[io]
;W[jp]C[White makes territory at the fourth line and white is no longer weak.])
(;B[ip]C[This is the key move to attack the white stones!]
(;W[go]C[When white comes out, black again hits the head of 2 stones.]
;B[gn]C[!]
(;W[io]C[Dangerous. Black can wedge]
;B[ho]
;W[hp]
;B[hn]
;W[jp]C[White can not attack like this.]
;B[iq]LB[jo:B][gq:A]C[White has 2 cuttingpoints now. Great for black.])
(;W[hq]C[When white makes the tiger's mouth, black can even block.]
;B[iq]
(;W[hn]C[White still can't play hane because black can cut.]
;B[ho])
(;W[io]
;B[ho]C[The same.])
(;W[ho]C[White has no choice.]
;B[jn]
;W[hn]
;B[gm]C[White is heavy. Black gained and white is not alive yet.]))
(;W[ho]C[If white omits the tiger's mouth, black has a sharp keima on the second line.]
;B[hr]
;W[gq]
;B[kp]C[Black attacks and makes territory at the same time.]))
(;W[ir]C[If white plays here, it's a gain for black too. White is very low.]
;B[go]C[Even if black just plays here, it's a success for black.])
(;W[hp]C[Not good either.]
;B[io])))))
