It’s amazing, for such a “straightforward, strong looking” position, how uncertain the outcome is!!
And would be positively depressing to have that invasion survive under that wall!
@jansen_jansen I think the moral of the story is that two small knights don’t secure a corner with certainty, despite all that re-inforcement.
In order to secure it, you need at least a diagonal - E3 or C5. As you built that wall, you could have sneakily "pushed outward less strongly (one might say “less greedily” ) and placed the stone on C5 instead of D5. Then you would have had a cut to defend, ending up with a stone of C4 as well.
I showed what I mean in your review. I didn’t try to play it out, but the “general guidelines” that people share from their experience says that this ought to be a whole lot more secure.