(27.12.2013) Nice miniature with Einstein Chess and two Echo model mates by Vito Rallo from Italy.

1.Kg2 Kg5 2.Kh3 Kf4 3.Bg6=S+ Kf3 4.Sh8=P Bxh8=R#

1.Bxe4=R Bxd4=R 2.Kg3 Kf5 3.Kh4 Rxe4=Q+ 4.Kh5 Qh1=R#

Miniature. Rooks play to opposite corners on “h” file.

Model Echo horizontal mirror Mates. (Author)

Einstein chess: every time a piece moves (without capturing), it "loses energy" and transforms itself ("is demoted") into a smaller unit, one step down the ladder from Queen to Rook to Bishop to Knight to Pawn. Every time a piece captures, it gains energy and   transforms itself ("is promoted") into the next bigger unit. Kings do not transform. A capturing Queen-move or a non-capturing   Pawn-move does not lead to any transformation.There are no promotions. So that you can have pawns on the 8-th rank   (where they are stuck). You can also have pawns on the 1st-rank (after a non-capturing Knight move): these pawns can make a single, double  or triple step forward. After a double or triple step,   they can be captured en-passant by an enemy pawn on the 3rd or 4th rank.   After a triple step, en-passant capture can take place on two different squares!