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'''[[Main Page|Home]] * [[Chess]] * [[Squares]] * Origin Square'''
The '''Origin Square''' of a [[Moves|move]], also called initial square, source square, from- or departure square, is the square occupied by a [[Pieces|piece]] about to move. The from-square is usually part of the [[Encoding Moves|move code]], while it is derived from giving the moving piece and [[Target Square|target square]] in [[Algebraic chess notationChess Notation#SAN|Standard Algebraic Notation]], where the origin square is (partly) omitted except to resolve ambiguity.
In [[Pieces versus Directions#PieceByPiece|piece wise]] [[Move Generation|move generation]], the origin squares are subject of an outer loop over all pieces, while the target squares are subject of an inner loop. [[Pieces versus Directions#DirectionWise|Direction-wise]] move generation traverses target squares per direction and generally requires more effort to determine the from-squares.
