Variant 1 (NOT the default variant!):
Piece moves as in classical chess.
If a piece has a neighbor (north, east , west or south) of its own colour, then the piece can move like its neighbor.
For example, a Pawn positioned next to a Queen has the movements of a Pawn plus those of a Queen.
Exceptions: Castling, promotion, 2-step pawn move and enpassant moves are not shared with other pieces.

Variant 2:
here the Pawns can only make their standard moves.
However, non-Pawn pieces inherit standard pawn moves and captures if they are adjacent to a Pawn.

Variant 3 (default variant):
Only non-Pawn pieces can inherit power to their neighbours.
This is the variant closest to ordinary chess and the variant easiest to be played by humans. Therefore this variant has been made the deafult variant (the one that comes up when you start the game).