(;
GM[1]FF[4]VW[]AP[Many Faces of Go:10.0]
SZ[19]
HA[0]
ST[1]
PC[Two Nine Stone Openings - Opening 1]
KM[5.5]
SO[BGJ 1, Summer 1967, Page 5a]

AB[dp][jp][pp][dj][jj][pj][dd][jd][pd]

C[British Go Association 1967, 1999 

];W[cn];B[dn];W[dm];B[en];W[co];B[cp];W[em]
(;B[fp]
C[Black 9: Instead of playing 9, Black could play 9' at A, white
10' at B, black 11' at 9 because of /\\.  
]LB[fk:B][fm:A]
;W[dg];B[fj]
C[Black 11' could have been played at 13(A).  
]LB[fd:A]
;W[gm];B[fd];W[gg]
C[White 14: If 14' was played instead at 15(A), Black's best reply
would be C.  
]LB[fg:C][hj:A]
;B[hj];W[hd]
C[White 16: White would not play 16 by choice, but is forced to
lest black play here and cut off white completely.  
]
(;B[ce]
C[Black 17: This play safeguards the corner, and is better than
a continuation at D for then the variation causes complications
which Black, of course, doesn't want.  
]LB[ff:D]
;W[nc];B[pf];W[nq]
C[White 20 threatens, with the support of 12, to invade at E and
destroy potential black territory.  
]LB[hp:E][gm:12]
;B[jq]
C[Black 21: A good play. It promises future attacks on white 20.
];W[qn];B[pn];W[pm];B[on]
;W[qq]
C[White 26: Since Black already has a stone at 21, White doesn't
play 27(A). Black would then answer with F, and although 22 and
24 would live, 20 would stand alone and hard pressed. For this
reason white first secures the corner with 26, thus abandoning
22 and 24 for the present, hoping for an opportunity to save
them later.  
]LB[nq:20][pm:24][qn:22][qp:F][qo:A][jq:21]
;B[qo];W[pq];B[om]
C[Black 29: Black would like to play at 20, but as this is already
occupied the best move is 29. G is used normally, but as [\] is
there 29 is better as it captures both stones.  
]LB[nq:20][qm:G]
;W[ph];B[nf]
C[Black 31: A typical attack by white, reducing the black potential,
answered in one of the best ways, separating the two white stones.

]LB[ph:30]
;W[rh];B[qj]
C[Black 33: A very good play in the circuumstances. White threatened
to play G and then to connect to 32 or /\\. After 33 the white
stones have lost all chances of survival.  
]LB[rh:32][qm:G]
;W[nh]
(;B[md]
C[Black 35: A play strongly attacking the white stone, possibly
better at 43(A) which is simpler, for then white H, black 42,
securing the corner and attacking the white stones strongly (see
variation).  

]LB[sf:I][nd:H][oc:A]
;W[pc];B[qc];W[od];B[pe]
C[Black 39: The normal play. Otherwise white will be able to connect
through the black position.  
];W[qb]
(;B[pb]
C[Black 41: The beginner, usually afraid to start a ko fight, would
probably have played J instead. This would have been a poor play,
as white would reply at 42(A) and even though the black group
lives, it is worth very little, see variation. It is then best
for Black to play 41 and engage in the ko fight. Should he lose
the ko, he is bound to gain an advantage elsewhere.  
]LB[ob:A][rc:J]
;W[ob];B[oc];W[ro]
C[White 44: Black must answer this, or else white (playing G) would
save his stones near there, and threaten black on the right side.
]LB[qm:G]
;B[rn];W[pc];B[lg]
C[Black 47' could also have threatened at 58(A) or 49(B), but 47
is a safer play, since it not only secures his own stones but
also cuts apart white's.  
]LB[oi:B][cl:A]
;W[pa]
C[White 48 takes because black has many more ko threats.  

];B[oi]
C[Black 49 continues the attack started with 47. He has lost the
ko, but was able to make the important plays 47, 49 and generally
made out well.  
]LB[lg:47]

(;W[ig]
C[White 50: If white had connected at 51(A) instead, black's reply
at K would have cut white off completely, see variation.  

]LB[mi:K][oh:A]
;B[oh]
C[Black 51: This play doesn't seem necessary at this time. However,
since black has no weak position to defend, the play is a good
one as it prevents possible future developments of an unpleasant
nature.  

];W[cc]
C[White 52: White wants to see how Black will react before deciding
on his future plans.  

];B[dc]
C[Black 53: This is the correct answer. Black can play this because
he has [\] already.  
];W[cf]
C[White 54: In this way White still brings use from the sacrificed
stone 52.  
]LB[cc:52]
;B[be];W[ho];B[hq];W[cl]
C[White 58: There was the constant threat that black might occupy
58, then white L, black M and white would have been very hard
pressed here.  

]LB[bl:M][cm:L]

;B[rp]
C[Black 59: A good play as white is forced to answer, to make sure
that black cannot play 61' at 60(A) and seriously endanger the
life of the white group.  

]LB[lq:A]
;W[lq];B[jh]
C[Black 61: There was the threat that white might play N, black
P, white Q reducing the large black potential.  
]LB[kh:Q][ij:P][ii:N]
;W[im]
C[White 62: Reducing the black potential slightly and stabilising
this group.  

];B[km]
C[Black 63: Completely securing the territory in the centre.  

After this white has almost no chance of winning, for though
he may be able to reduce the north west corner somewhat the two
/\\ stones are very weak.  
])
(;W[oh];B[mi]))
(;B[rc];W[ob]))
(;B[oc];W[nd];B[ob]LB[ob:3][nd:2][oc:1]
))
(;B[ff];W[fg];B[he];W[ie];B[id]LB[id:5][ie:4][he:3][fg:2][ff:1]
))
(;B[fm];W[fk];B[fp]LB[fp:3][fk:2][fm:1]
))
