.chess-piece {
    width: 72px;
    height: 64px;
    background-image: url('../img/chessPieces.png');
    background-size: 432px 128px;
    background-repeat: no-repeat;
    display: block;
}

/* Black pieces - top row of sprite */
.chess-piece.bR { background-position: 0px 0px; }
.chess-piece.bB { background-position: -72px 0px; }
.chess-piece.bQ { background-position: -144px 0px; }
.chess-piece.bK { background-position: -216px 0px; }
.chess-piece.bN { background-position: -288px 0px; }
.chess-piece.bP { background-position: -360px 0px; }

/* White pieces - bottom row of sprite */
.chess-piece.wR { background-position: 0px -64px; }
.chess-piece.wB { background-position: -72px -64px; }
.chess-piece.wQ { background-position: -144px -64px; }
.chess-piece.wK { background-position: -216px -64px; }
.chess-piece.wN { background-position: -288px -64px; }
.chess-piece.wP { background-position: -360px -64px; }