low enclosure low extension invasion
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This is a practical application of Invasion Of Third Line Three Space Extension. Black has a corner enclosure. The stone may have been played as a wedge on the upper side, then the tsume of has been played as an extension of the enclosure, to which White likely responded by making a base for on the left (not shown). Next, White can invade at .
Of all the variations to the invasion, the attack by can be considered standard, since this is Black's sphere of influence. Up to can be expected. Black turns his original enclosure into actual territory while White leads in the running fight between the invading group and the dislodged extension. may need some explanation.
If here, there is funny business in the corner. White creates that aji so that cannot be cut at a. Incidentally, Attack and Defense notes that it is better for white to force with here so there are no ladder issues for white and to prevent black from linking up at b. can also be at b: