How to use the chessground/util.opposite function in chessground
To help you get started, we’ve selected a few chessground examples, based on popular ways it is used in public projects.
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Happy0 / ssb-chess / ui / game / PieceGraveyard.js View on Github 
function getMaterialDiff(pieces) {
var diff = {
white: { king: 0, queen: 0, rook: 0, bishop: 0, knight: 0, pawn: 0 },
black: { king: 0, queen: 0, rook: 0, bishop: 0, knight: 0, pawn: 0 },
};
for (let k in pieces) {
const p = pieces[k], them = diff[opposite(p.color)];
if (them[p.role] > 0) them[p.role]--;
else diff[p.color][p.role]++;
}
return diff;
}
