1

Horizontal: wherein the rook attacks down a rank.

I have composed horizontal castling checkmates for both the queenside and kingside. Is there any possible way to make these mates go any faster?

Kingside Castling Game.

Queenside Castling Game.

See my former question about vertical castling here.

3

Kingside castling, 8.5 moves (fastest; no way for a king to reach the last rank any faster than this.)

[FEN ""]
1. e4 d6 2. b4 Kd7 3. Nh3 Kc6 4. Bb5+ Kxb5 5. Nc3+ Kxb4 6. Ba3+ Kxa3 7. Qh5 Kb2 8. Qb5+ Kxa1 9. O-O#

Queenside castling: 8.5 moves (again, fastest.)

[FEN ""]
1. d4 e6 2. g4 Ke7 3. Na3 Kf6 4. Bg5+ Kxg5 5. Nf3+ Kxg4 6. Bh3+ Kxh3 7. Qd3 Kg2 8. Qg6+ Kxh1 9. O-O-O#

There you have it. The theoretical fastest is 8.0 moves if you try to let black deliver mate instead of white, but I couldn't find a way to set up the mating net or to avoid locking the king out. Feel free to try.

  • 1
    @Ywapom: The enemy king needs 8 moves to reach the other side of the board (7 king moves and one pawn move to make space). – user1583209 Feb 28 at 17:58
  • 1
    ah, so is this the fastest vertical mate? – Ywapom Feb 28 at 18:17

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