(;FF[4]
CA[UTF-8]
GM[1]
GN[Becoming 9 kyu - Lesson 11]
PC[https://online-go.com/review/395780]
PB[Black]
PW[White]
BR[2d]
WR[2d]
OT[Error: time control missing]
RE[?]
SZ[19]
KM[6.5]
RU[Japanese]

(;B[qd]
;W[dd]
;B[pp]
;W[dp]
;B[fq]
;W[cn]
;B[pj]
;W[jd]
;B[cf]
;W[ce]
;B[df]
;W[gc]
;B[ci]
;W[ck]
;B[cj]
;W[dk]
;B[ei]
;W[bf]
;B[bg]
;W[be]
;B[dr]
;W[nq]
;B[qn]
;W[eq]
;B[er]
;W[fp]
;B[gq]
;W[gp]
;B[hq]C[Hi! This lesson is about opening rules. There are two things you should be aware of in the opening. First, you shouldn't try to play endgame moves in the opening. In a way, that sounds too obvious. But some players try to. Let's look at an example.

This game was played by two 9 kyu players. There were many big points on the board.]
;W[cq]C[White played at 3-3. This was big. There were many bigger points, but that move was fine.]
(;B[cr]C[Black played here next. What do you think of this move? Many players follow their opponents around the board.]
;W[bq]C[It was time for White to play away, but White responded. We see sequences like these from time to time. It isn't good to make endgame plays when you have many other places to play.]
)(;AE[cq]C[Where should the players have played then?]
(;AW[pr]C[First, White needed to slide into the corner.]
;B[qq]
;W[kq]C[Then this extension is very big. 

Rule 1 of the opening is: Don't play endgame moves in the opening. ]
)(;AW[oc]C[This corner was also unfinished. Corner enclosures and approaches are huge. Remember not to play endgame moves in the opening!]
)))(;B[pd]
;W[dp]
;B[pp]
;W[dd]
;B[pj]
;W[nc]
;B[jp]
;W[dj]
;B[pf]
;W[jd]
;B[cc]
;W[cd]
;B[dc]
;W[ec]
;B[eb]
;W[fb]
;B[fc]
;W[ed]
;B[gb]
;W[fd]
;B[fa]
;W[gc]
;B[fb]
;W[qn]
;B[qo]
;W[pn]
;B[np]
;W[pl]C[Rule 2 of the opening is: Never play away in the middle of a fight. Even if there are big points, don't play away while fighting.

This position is from a game played between two pros. What's the biggest point now? (The white stones on the right are fine for now.)]
(;B[fq]C[For Black, this approach is huge.]
)(;AW[hq]C[On the other hand, White would also like to play here.]
)(;B[hc]C[Black, however, ataried here in the actual game. Moves on the right side were also possible, since there's an unresolved, but stable, fight there, too.]
;W[gd]C[Even though playing in the lower left corner is big, you mustn't allow Black a diamond shape by capturing this stone.]
;B[hd]C[So White connected and Black pushed.]
;W[he]C[White still couldn't play away, so White haned.]
;B[ie]C[Black haned too,]
;W[id]C[And White cut immediately.]
;B[hf]
;W[ge]
;B[ib]C[In response, Black played a tiger's mouth to defend the two stones. Here's a question: Can White play away now? The fight was still underway up here, so a playing away wasn't a good idea.]
;W[pc]C[White needed to continue, so White attached and settled in the corner.]
;B[qc]
;W[od]
;B[pe]
;W[if]C[After these exchanges, White cut here and began fighting. What do you think of this sequence? Had White played away, Black would have attacked White's group at the top, taking control of the game. Previously, we talked about how a battle can sometimes begin in the opening. When that happens, don't rush to play away!]
)))