33. ... Nd1 is the logical continuation of 30. ... Ra4. it enables us to reposition our knight on a better square (e3), while at the same time putting his king back on the first rank.
you probably mean Rxa2 followed by Be6. in that case, it was a bit considered (see previous threads); black is one pawn down or so (one bishop and a pawn for a rook) and without any real advantage... black will struggle for nothing but a draw, whereas in this variation, we still hope a win !
This one had a surprisingly small turn out. Thanks to everyone that posted. Hopefully, more people will turn out for the next move vote. I will mail Nd1+ now.