Ghostrider Chess.

This variant I devised just after the Ghostrider (tm) movie hit the market.

Setup

Same as FIDE.

Pieces

Same as FIDE.

Rules

All rules apply, except: when a knight is in the presence of evil (threatened by other piece), he turns in to a ghostrider.

The ghostrider is a Knightrider that can also captures by aproach, "the penitence stare", so, a ghostrider can capture 2 pieces in one single move, one by replacement and other by aproach.

Notes

I'm not very fond of pieces with powers, so, I believe that will be the only one, feel free to expand the concept to otrer pies and variants.