Chess960 position 310

The back rank is N Q B R K B R N. The king starts on e1, the rooks on d1 and g1, the bishops on c1 and f1, the queen on b1.

White has 18 legal first moves, fewer than the twenty of the standard array, because the knights reach a different number of squares from where they stand.

Castling short, the king goes from e1 to g1 and the rook goes from g1 to f1.

Castling long, the king goes from e1 to c1 and the rook stays on d1.

One thing about castling here surprises people: the queenside rook already stands on d1, so castling long moves only the king.

The pawn on h2 starts with no defender at all.

Every rule of chess applies here unchanged apart from castling, which the rules page explains in full. To play this exact arrangement against the computer, open position 310 on Play CPU. To train tactics on positions like it, use the Chess960 puzzle trainer.