Noun
kingside (usually uncountable, plural kingsides)
(chess) The side of the chessboard nearest to the king (at the opening position).
Black, in contrast, suffers from a bad bishop on c8, which is prevented by the black pawns from finding a good square or helping out on the kingside. Source: Internet
Castling is indicated by the special notations 0-0 for kingside castling and 0-0-0 for queenside castling. Source: Internet
If one player castles kingside and the other queenside, it is called opposite (or opposite-side) castling. Source: Internet
In addition, queenside castling requires moving the queen; therefore, it may take slightly longer to achieve than kingside castling. Source: Internet
It is common for both players to castle kingside, and rare for both players to castle queenside. Source: Internet
The vertical columns of squares (called files ) from White's left (the queenside ) to his or her right (the kingside ) are labeled a through h. The horizontal rows of squares (called ranks ) are numbered 1 to 8 starting from White's side of the board. Source: Internet