pgn-parser
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Support crazyhouse + tests
Supports crazy house notation: https://en.wikipedia.org/wiki/Crazyhouse
<Piece name>@<Square>
@ drops a piece on a target square
e.g.
B@f3: Drop a bishop on f3
@d5: Drop a pawn on d5
Q@f7#: Drop a queen on f7 giving a checkmate