Community variant

Hailstorm-chess

Promote to a knight and capture opponent's queen to win

This is a user-catalogued casual variant. Technical details such as board size, FEN, pieces, and hand rules are defined in the Fairy-Stockfish variants.ini block below.

Uploaded by: Hailstorm
Visibility: public
Status: active

Generated rule overview

This variant inherits its base rules from `makruk` and overrides the settings shown below.

Board and setup

Default starting position

Pieces and movement

The piece set used on the board is: piece (m), piece (s) and knight (n).

Move rules

Check restrictions are disabled; kings/royal pieces may be capturable depending on the variant goal.
Castling is not allowed.

Promotion

Promotions are available in the configured promotion zones. The the promotion region for White is all squares on rank 8 and the promotion region for Black is all squares on rank 1.
The pieces that can promote are: piece (s).
Promotion choices are both sides: knight (n).

Winning and losing

A flag/goal-zone win is active for piece(s) n.

Fairy-Stockfish rules

[khonhill:makruk]
# Remove royal kings since this is a pure flag capture game
king = -
checking = false
castling = false

# Overwrite the inherited Makruk piece table to wipe Kings (K) and non-existent pieces (B/Q).
# This string maps exactly what Makruk understands: P, N, R, S (Khon), M (Met), and fills the rest with dots.
pieceToCharTable = PN.R.SM............pn.r.sm............

# Khon is internally 's' and Met is 'm'
promotionPawnTypes = s
promotionPieceTypes = n
# Force promotions to happen ONLY on the final ranks
promotionRegionWhite = *8
promotionRegionBlack = *1

# Winning Condition: A Knight (n) landing on the enemy's trapped Queen square wins
flagPiece = n
flagRegionWhite = h5
flagRegionBlack = a4

# Start FEN: 
# - Ranks 1, 2, 7, 8 are completely filled with Khons (S/s)
# - Rank 6: White's walls on g6, h6
# - Rank 5: Black's walls on a5, b5; White's wall on g5; Black's trapped Met (m) on h5
# - Rank 4: Black's trapped Met (M) on a4; Black's wall on b4; White's walls on g4, h4
# - Rank 3: Black's walls on a3, b3
startFen = ssssssss/ssssssss/6**/**4*m/M*4**/**6/SSSSSSSS/SSSSSSSS w - - 0 1