(;GM[1]FF[4]CA[UTF-8]AP[CGoban:3]ST[2]
RU[Japanese]SZ[19]KM[0.00]
AW[cq][dq][eq][fq][br][er][gr][bs][gs]AB[bp][cp][dp][ep][fp][hp][bq][gq][ar][hr][ds][hs]C[This is the problem position. Status?]
(;B[cr]C[If black plays to kill white then he can try here.]
;W[dr]C[But white can answer here]
(;B[es]
;W[cs]C[This follow up line doesn't kill])
(;B[fs]C[But black can play here next ]
(;W[es]C[This is self-atari.])
(;W[fr]C[And this is self-atari])
(;W[cs]C[So white must capture]
;B[fr]
;W[es]C[And the best black can do is capture 2 of the stones.])))
(;B[fr]C[If black throws in]
(;W[fs]
;B[es]C[White cannot capture as he quickly gets caught]
;W[fr]
;B[cr])
(;W[es]
;B[fs]C[This reply for white fails too.])
(;W[dr]
;B[es]
(;W[fs]C[White can't do this line as he gets caught
in the snap-back]
;B[fr])
(;W[cs]
;B[fs]C[And this fails also]))
(;W[cs]C[This also fails]
;B[es]
;W[fs]
;B[fr]))
(;B[es]C[Black may also be able to start here]
(;W[dr]
;B[fs]C[White can't save the stones here because
of damezumari]
;W[fr]
;B[cr])
(;W[cs]C[This move looks stronger for white]
;B[fr]C[But white is still trapped by the throw in.]))
(;B[fs]C[Is this another captureing move by black?]
(;W[es]
;B[fr]C[This way clearly dies])
(;W[fr]
(;B[cr]
;W[es]C[This looks like a seki as white can't atari the two
inside stones, but black can play from the 
outisde and capture the two white ones.])
(;B[es]C[Black mus't connect as this is a seki.]
;W[cr])))
(;B[cs]C[This black move is not correct.]
;W[es]
;B[fs]
;W[fr])
(;B[dr]C[Nor is this]
(;W[es]
;B[fs]
;W[fr])
(;W[cr]C[This white answer is wrong though]
;B[es]
;W[fr]C[This is a dead shape]))
(;B[]C[So if it white's turn can he save them?]
(;W[fs]C[This clearly fails]
;B[es]
;W[fr]
;B[cr])
(;W[es]C[This seems to work]
(;B[fs]
(;W[fr]
;B[cr]C[This shape we have seen before and it is not
seki, white is dead.])
(;W[dr]C[But white can play here]
(;B[fr]
;W[cs]C[And lives])
(;B[cs]
;W[fr]C[Also alive])))
(;B[cr]
(;W[dr]
;B[fs]
;W[cs]
;B[fr]C[Also alive despite losing two stones])
(;W[fs]C[This is not seki again.]))
(;B[dr]C[This is not correct for black]
(;W[fs]
;B[cr]C[This is alive]
;W[cs])
(;W[cr]
;B[fs]
;W[fr]C[And so is this alive])))
(;W[cs]
(;B[es]
;W[dr]C[White has good enough shape to avoid capture])
(;B[fs]C[However after this white has to lose 2 stones agains]
(;W[fr]
;B[es]
;W[cr]C[Dead])
(;W[es]
(;B[fr]
;W[dr]C[Alive losing 2])
(;B[dr]
;W[fr]C[Again alive]))))
(;W[dr]C[This move also seems to live
and is the only way to avoid having to give
up 2 stones.  This is the correct move.]
(;B[es]C[This only threatens snap-back on one side]
;W[cs]C[so white can live.])
(;B[fs]
;W[fr]C[There is no damezumari here])
(;B[fr]
;W[fs]C[nor here]))))
