ProtoDeuteric: makes an immediate eye while threatening to lasso tbe two white stones.
protects from it, but is too slow for
, which creates the other eye, and life with it. Noticing that
also threatens the
group, white presumably has to respond by connecting to her outside group with
, thus ending this sequence in gote.
Also notice that could be played at
(next diagram)
ProtoDeuteric: If white plays this way, puts the upper black stones in atari. Black must respond at
.
, in turn, threatens the
group, so white must respond with
.
puts the entire black group in atari, so black must capture the entire invading white group with
. In the sequence itself, white loses (and black gained) a lot more (locally) than he needed to.