client/src/data/problemCheck.js

   1 export function checkProblem(p)
   2 {
   3   const vid = parseInt(p.vid);
   4   if (isNaN(vid) || vid <= 0)
   5     return "Please select a variant";
   6
   7   if (!V.IsGoodFen(p.fen))
   8     return "Bad FEN string";
   9 }