(;GM[1]FF[4]CA[UTF-8]AP[CGoban:3]ST[2]
RU[Japanese]SZ[19]KM[0.00]
PW[CHH]PB[XX]
;B[pd]
;W[dd]
;B[pq]
;W[dp]
;B[fq]
;W[po]
;B[cn]
;W[dn]
;B[dm]
;W[en]
;B[cp]
;W[co]
;B[bo]
;W[do]
;B[bm]
;W[cq]
;B[bp]
;W[em]
;B[dl]
;W[ip]
;B[nq]
;W[qq]
;B[qr]
;W[qp]
;B[rr]
;W[qk]
;B[cf]
;W[fc]
;B[fk]LB[nc:A][ef:B][gp:D][eq:E][lq:C]C[The starting position. 
On the RHS a simple joseki is played out where Black secures territory and white settles the position up to 26. With 27 and 29 black enlarges his position on the LHS . 

DW  What is really going on in  this position ? 

points to consider are 
a) the status of the white group in the lower LHS 
b) the importance of sente particularly at this stage of the early middle game 
c) how to make sure you get good value (efficiency) for moves played]
(;W[nc]C[A - White emphasis the top but black 6 is a strong move and after 6-12 the white stones on the LHS are floating  thi s is a failure for white.]
;B[qf]
;W[pb]
;B[qc]
;W[ld]C[White plays big points but loses sente - what can black do ? ]
;B[hq]C[DW - Putting this stone in motion leaves white with a difficult game ]
;W[iq]
;B[hp]
(;W[io]
;B[ho]
;W[in]
;B[hn])
(;W[ho]C[If White tries to seal black in there is trouble after black cuts with 2 which is a strong move. if white persists with trying to play aggressively things go badly after 7, 8 is a tesuji and after 18 the white stones are dead. ]
;B[io]
;W[hn]
;B[jo]
;W[kq]
;B[kp]
;W[hr]
;B[ir]
;W[jr]
;B[is]
;W[js]
;B[jq]
;W[hs]
;B[ir]
;W[is]
;B[jp]
;W[ir]
;B[gr]))
(;W[ef]C[B - white 1 controls the black position on the LHS, but after black 2 white is in trouble black 4 and 6 cts white into 2 groups which is clearly bad for white.]
;B[hq]C[DW again black puts the stone in motion and achieves a similar result ]
;W[iq]
;B[go]
;W[gm]
;B[hn]
;W[hm]
;B[in])
(;W[lq]C[C - Whites main aim is to settle the lower side but black 2 still successfully invades the white position after black 8 the group is alive and white needs to play 9 to protect against the cut. White position is an "empty shell." and black gets sente. ]
;B[hq]
;W[iq]
;B[hp]
;W[ho]
;B[dr]C[Black uses a back door and white has to defend so black can take sente ]
;W[dq]
;B[cr]
;W[io]
;B[nc])
(;W[gp]LB[dq:A][ir:B]C[D - White tries to seal black from above - but this move lacks power, black is left with both the cut at A to play or B where the white position has "an open door" - Black is enjoying this.  ])
(;W[eq]C[E - this white 1 is the correct move. If black resits by playing 2 white is satisfied to force black to take a low inefficient position after black connects white takes sente to play 11 which looks out - white is good. ]
(;B[fp]
;W[hn]
;B[ir]
;W[jq]
;B[jr]
;W[lq]
;B[kr]
;W[mo]
;B[lr]
;W[qf])
(;B[go]C[If black plays this 2 in an attempt to foil whites plan to be sealed in then first white plays 3 and 5 preventing  black connecting with the group on the LHS and plays 7 starting a race to live. White can aim later at A and also can connect to the group on the LHS with the sequence B,C,D. ]
;W[gm]
;B[hn]
;W[hm]
;B[in]
;W[lq]LB[fp:C][gp:B][gq:D][or:A])
(;B[kq]C[This black 1 is also not good black is making territory where already strong. White is pleased to tenuki to play the big points 2- 6. When black returns to the lower side white plays 8 to threaten to seal the black stones. White again gets sente to play 10 White is good.]
;W[qf]
;B[nc]
;W[rd]
;B[qc]
;W[ph]
;B[fp]
;W[hn]
;B[ir]
;W[lc])
(;B[bd]C[In the actual game black realised that the lower side had no real value and so was not an interesing area to play. The game continued 1-13. The result was white won after 172 moves. ]
;W[ic]
;B[qi]C[Black could not find a satisfactory continuation and so ignored the lower side completely ]
;W[qf]
;B[nc]
;W[of]
;B[qe]
;W[rf]
;B[pk]
;W[pl]
;B[ok]
;W[qj]
;B[pi])))
