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And some more:
Fighter Pawns, which can capture forward in addition to normal pawn
moves,
Quickpawns, which can always use the double step move,
Zip Pawns, which can always move any number of squares forward,
Pawn Plus, which can move sideways but not capture,
Berolina Pawn Plus, which can capture sideways and
Chinese Pawn Plus, which can move and capture one square forward and one
square sideways always.

all these are merely suggestions.