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Introducing Marshall and Cardinal - White checkmates in two (author Christian Freeling)
The second difference is the absence of a castling rule: there's no need for it.

The third difference concerns pawns and promotion. Pawns basically behave like Chess pawns: they have the option to move two squares initially and en passant capture applies as usual.
There are two differences however, concerning promotion:

  • Pawn promotion is optional on moving to the 8th or 9th rank, compulsory on moving to the 10th.
  • A pawn can only promote to a piece lost by its side.