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'Amphibian Chess: Standard chess array and noncapturing moves of pieces.
Units must leap over opposing spaces on a normal arrival space to the next
space beyond to capture, unless the opposing unit is on the edge and there
is no 'next space beyond' in the direction of movement (in which case
the capture occurs as in standard chess). 

For the purpose of determining the next space beyond, a Knight's normal
leap is viewed as one space orthogonally followed by one space diagonally
(through a corner adjacent to the opposite side); a Knight's one space
beyond is one additional space diagonally (i.e., to a space a [3,2] leaper
might have reached).

All other rules are as in standard chess.'