Vertical: wherein the rook attacks down a file.
I wish to know the fastest possible castling checkmates, for both queenside and kingside, that are a vertical one.
See my question about horizontal castling here.
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Mate in 6.0 for kingside.
[FEN "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1 "] 1. e4 e6 2. Bc4 Bd6 3. Ke2 Qg5 4. Kf3 Nh6 5. Bxe6 fxe6 6. Qe2 O-O#
And 5.5 for queenside, even faster.
[FEN "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1 "] 1. d4 Nc6 2. Nc3 Nxd4 3. Qxd4 e5 4. Qc4 Ke7 5. Bg5+ Kd6 6. O-O-O#
This should be fastest.