Community variant

Sentry

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: King_Keeg
Visibility: public
Status: active

Generated rule overview

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

Board and setup

Default starting position

Pieces and movement

The piece set used on the board is: king (k), queen (q), rook (r), bishop (b), knight (n), pawn (p), custom piece 1 (s) and custom piece 2 (c).
custom piece 1 (s) is a custom piece with Betza movement `2R2B`.
custom piece 2 (c) is a custom piece with Betza movement `K`.

Promotion

The pieces that can promote are: pawn (p).
Promotion choices are both sides: queen (q), rook (r), bishop (b), knight (n) and custom piece 2 (c).

Piece movement

These diagrams show custom pieces and known Fairy-Stockfish built-in fairy pieces from White's perspective on a compact preview board. Some special moves, especially hoppers and game-state-dependent moves, can still depend on blockers or game state.

Custom piece 1 (S) movement

2R2B

Custom piece 2 (C) movement

K

move capture move or capture initial only hopper target

Fairy-Stockfish rules

[sentrychess5:chess]
# 1. Define White's custom Sentry pieces ('s') with a 2-square range limit:
# - 2R : Orthogonal moves up to 2 squares (forward, back, left, right)
# - 2B : Diagonal moves up to 2 squares 
customPiece1 = s:2R2B

# 2. Define the "Disposable King" (Commoner: non-royal King movement 'K')
customPiece2 = c:K

# 3. Allow promotion to Queen, Rook, Bishop, Knight, or Disposable King ('c')
promotionPieceTypes = qrbnc

# 4. Asymmetric start: White uses Sentries ('S'), Black uses standard pawns ('p')
startFen = rnbqkbnr/pppppppp/8/8/8/8/SSSSSSSS/RNBQKBNR w KQkq - 0 1