H. G. Muller wrote on Tue, Feb 15, 2011 09:51 PM UTC:
Very nice. It shows the power of a jump. A diagonal slider can seldomly do this (except in fool's mate), but here it does not matter that d2 is defended several times. Blocking the check is not possible.
I guess tactical motifs like this are what makes a pair of Lieutenants about equivalent to a Bishop pair. Something that much surprised me. Apparently the single non-blockable 2-square jump has nearly the same value as all distant moves of a slider, which can be blocked.