Deal one of the 960 Fischer Random starting positions, drawn on the board with its official number -- opening theory not included.
Chess960, also called Fischer Random, shuffles the back-rank pieces into one of 960 legal starting positions before the game begins. Two constraints govern the shuffle: the bishops must sit on opposite-coloured squares, and the king must stand between the two rooks so castling remains possible. Bobby Fischer proposed it in 1996 to defuse opening preparation, which by then let strong players follow memorised lines twenty moves deep. FIDE now runs an official world championship for it, and castling in a randomised position always finishes with king and rook on their standard squares.
This generator deals one of the 960 legal Chess960 (Fischer Random) starting positions, drawn on a board diagram with its official position number and back-rank arrangement. The 960 setups are exactly those where the bishops sit on opposite colors and the king stands somewhere between his rooks -- classical chess is simply position #518.
Every result here is drawn using crypto.getRandomValues() -- the Web Crypto API's cryptographically secure randomness -- instead of Math.random(), so it's genuinely unpredictable, not just statistically random. Learn more.
Chess960 players use it to deal a fresh, unmemorizable starting position for a casual or training game -- the variant Bobby Fischer designed to make opening theory useless. Coaches use random positions to teach principles over memorization, and curious classical players use it to see how strange home can look.
Generate picks one of the 960 positions uniformly using the site's cryptographically secure randomness, guaranteed not to repeat whatever position is currently showing in single-result mode. The board renders the full starting setup for both sides, the caption gives the back-rank arrangement, and the description names the bishop, knight, and king files -- with position numbers following the standard Chess960 numbering scheme.
Two constraints cut the possibilities down: the bishops must start on opposite-colored squares and the king must stand between his rooks (so castling works). Of all arrangements of the eight back-rank pieces, exactly 960 satisfy both.
However the pieces start, castling puts the king and rook on the same squares they'd reach in classical chess -- king to g1 and rook to f1 kingside, king to c1 and rook to d1 queenside -- provided the usual conditions hold.
Yes -- this generator uses the standard Chess960 numbering scheme used by engines and servers, under which the classical starting position is #518. Deal that number and the description will tell you.
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