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Planar is correct as new piece-type. Also, as I see it on reflection, Planar is most closely associated with Leaper. Planar is a provisional leaper in the classification index of piece-types. Planar is compound leaper with restriction for intermediacy. Now the introduction (well, Gavin Smith's and couple of others preceded) to them here has no set values for their axes. Let's take just one leg of Jiaoye's qualified leap from c1 to d4, visualizing regular squares that we are used to calling Camel's destination. If any of d2, c3, or a3 are occupied, Jiaoye cannot leap to d4. So we can say Planar is subset of Leaper. Simplified, the Planar unit cannot go some specific place(s) if there is certain specific occupation(s). The intervening piece voids the move. However, Leaper can easily encompass other categories Slider, Rider, and Multi-path if we are very careful of definitions. New thread CBM10 follows this up.