En Passant

A rule in the GameOfChess that allows a pawn to capture a pawn that has moved two spaces by moving into the empty square through which the captured pawn passed, but only in the move immediately following the two-space move.

The term is French for "in passing".


Also, the friendly name for this PerlIdiom:

  my $x = "Abc";
  (my $y = $x) =~ s/A/D/;

Now, $x is "Abc" and $y "Dbc" ($y was declared, assigned "Abc", and substituted upon)


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