(;GM[1]FF[4]CA[UTF-8]AP[CGoban:3]ST[2]
RU[Japanese]SZ[19]KM[0.00]
PW[]PB[Black to play]C[Just play through the moves to move 26 which is the problem
position. These do not represent a game sequence!]
;B[pp]
;W[op]
;B[pq]
;W[oq]
;B[oo]
;W[po]
;B[on]
;W[pn]
;B[pm]
;W[rn]
;B[rm]
;W[sn]
;B[qn]
;W[qo]
;B[qm]
;W[rp]
;B[sm]
;W[pr]
;B[qq]
;W[qr]
;B[rq]
;W[rr]
;B[sq]
;W[or]
;B[sr]
;W[ss]C[This is the problem position. Black to play
win the capturing race. ]
(;B[sp]C[CORRECT: Normally playing a stone that can be 
captured is the correct move in this sort of fight,
but the key to this position is the single stone in the
corner that causes white a problem when it is captured.]
(;W[rs]C[If white saves the odd stone...]
(;B[ro]C[...black easily captures every thing with the throw-in]
;W[so]
;B[ro])
(;B[so]C[This move works as well and is a little more direct.]
;W[ro]
;B[qp]))
(;W[ro]
;B[rs]C[After this capture black has one more liberty and white
is in self-atari if he tries T5 or R4.]
;W[qs]
;B[so]
;W[ss]
;B[qp]C[Coming from the corner is not fast enough for white.]))
(;B[ro]C[FAILURE: Often correct but gives white an eye here
which loses the fight for black.]
;W[so]C[Now it's black that cannot play T4 or R3 without self-atari.]
;B[rs]
;W[sp]C[Black still cannot continue with R3 and it's one eye
beats no eye - black is doomed.])
(;B[so]
(;W[ro]
;B[rs]
;W[sp]C[FAILUERE: Again one eye beats no eye.])
(;W[sp]
;B[ro]
;W[qp]C[FAILURE: This is a mistake for white as he could have saved 
the two stones that got captured.]))
(;B[rs]
;W[sp]C[FAILURE: Capturing the corner first also doesn't work as
again white makes an eye.]))
