Sorry, I overlooked the notation of the Omega Chess preset is different from what I imagined the Omega Chess rules page diagrams were (i.e. White first rank, not counting wizard initial cells, labelled with a 1). Anyway, even with the latest version of the preset, with a Black pawn on d3, if a White pawn triple steps to e4, the preset does not show that taking en passant by the Black pawn (i.e. moving to e2) is allowed, but the preset allows it if I try it for Black (in Move Mode).
The preset does correctly not allow a Black pawn on e2 to take a White pawn that double steps f1 to f3 (i.e. ...p e2-f1 is not shown as a legal option, nor allowed at all, by preset).
@ Fergus:
Sorry, I overlooked the notation of the Omega Chess preset is different from what I imagined the Omega Chess rules page diagrams were (i.e. White first rank, not counting wizard initial cells, labelled with a 1). Anyway, even with the latest version of the preset, with a Black pawn on d3, if a White pawn triple steps to e4, the preset does not show that taking en passant by the Black pawn (i.e. moving to e2) is allowed, but the preset allows it if I try it for Black (in Move Mode).
The preset does correctly not allow a Black pawn on e2 to take a White pawn that double steps f1 to f3 (i.e. ...p e2-f1 is not shown as a legal option, nor allowed at all, by preset).