local p = {}  function chessboard(args, size, rows, cols, rev, trans, lightdark, altprefix, letters, numbers, header, footer, align, clear)     function colchar( col )         return (col <= 26) and ( "abcdefghijklmnopqrstuvwxyz" ):sub( col, col )          	or ( "abcdefghijklmnopqrstuvwxyz" ):sub( math.floor((col-1)/26), math.floor((col-1)/26) )          		.. ( "abcdefghijklmnopqrstuvwxyz" ):sub( col-math.floor((col-1)/26)*26, col-math.floor((col-1)/26)*26)     end     function image_square( pc, row, col, size, t, flip, altprefix )         local colornames = { l = 'সাদা', d = 'কালো', u = 'রঙ অজানা' }         local piecenames = {              p = 'বোড়ে',              r = 'নৌকা',              n = 'ঘোড়া',              b = 'গজ',              q = 'মন্ত্রী',              k = 'রাজা',              a = 'আর্চবিশপ',             c = 'চ্যান্সেলর',              z = 'বীর',              w = 'জাদুকর',              t = 'বোকা',              h = 'উল্টানো বোড়ে',              m = 'উল্টানো নৌকা',              s = 'উল্টানো ঘোড়া',              f = 'উল্টানো রাজা',               e = 'উল্টানো গজ',              g = 'উল্টানো মন্ত্রী',             G = 'জিরাফ',             U = 'ইউনিকর্ন',             Z = 'জেব্রা'             }         local symnames = {              xx = 'কালো পারাপার',              ox = 'সাদা পারাপার',              xo = 'কালো বৃত্ত',              oo = 'সাদা বৃত্ত',             ul = 'উপরে-বামে তীর চিহ্ন',              ua = 'উপরে তীর চিহ্ন',              ur = 'উপরে-ডানে তীর চিহ্ন',              la = 'বামে তীর চিহ্ন',              ra = 'ডানে তীর চিহ্ন',             dl = 'নিচে-বামে তীর চিহ্ন',              da = 'নিচে তীর চিহ্ন',              dr = 'নিচে-ডানে তীর চিহ্ন',              lr = 'বামে-ডানে তীর চিহ্ন',              ud = 'উপরে-নিচে তীর চিহ্ন',             db = 'উপরে-ডানে ও নীচে-বামে তীর চিহ্ন',             dw = 'উপরে-বামে ও নীচে-ডানে তীর চিহ্ন',             x0 = 'শূন্য',              x1 = 'এক',              x2 = 'দুই',              x3 = 'তিন',              x4 = 'চার',              x5 = 'পাঁচ',              x6 = 'ছয়',              x7 = 'সাত',              x8 = 'আট',              x9 = 'নয়'         }         local color = mw.ustring.gsub( pc, '^.*(%w)(%w).*$', '%2' ) or         local piece = mw.ustring.gsub( pc, '^.*(%w)(%w).*$', '%1' ) or          local alt = altprefix .. colchar( col ) .. row .. ' '         if ( colornames[color] and piecenames[piece] ) then             alt = alt .. colornames[color] .. ' ' .. piecenames[piece]         else             alt = alt .. ( symnames[piece .. color] or piece .. ' ' .. color )         end         local ld = t and 't' or ((((row + col + flip) % 2) == 0) and 'd' or 'l')                  return string.format( '%dx%dpx|alt=%s|%s', piece, color, ld, size, size, alt, alt )     end      function letters_row( rev, num_lt, num_rt, cols )         local res = '' .. ( num_lt and '' or  ) .. ''         for k = 1, cols do             res = res .. colchar(rev and (cols - k + 1) or k) .. ''         end         res = res .. '' .. ( num_lt and '' or  ) .. ''         return res     end     local letters_tp = letters:match('both') or letters:match('top')     local letters_bt = letters:match('both') or letters:match('bottom')     local numbers_lt = numbers:match('both') or numbers:match('left')     local numbers_rt = numbers:match('both') or numbers:match('right')     local width = cols * size + 2     local flip = lightdark and 1 or 0     if ( numbers_lt ) then width = width + 18 end     if ( numbers_rt ) then width = width + 18 end      local b =     local caption =       if ( letters_tp ) then b = b .. letters_row(rev, numbers_lt, numbers_rt, cols) .. '\n' end     for trow = 1,rows do         local row = rev and trow or (rows - trow + 1)         b = b .. ''         if ( numbers_lt ) then b = b .. '' .. row .. '' end         for tcol = 1,cols do             local col = rev and (cols - tcol + 1) or tcol             local idx = cols*(rows - row) + col + 2             if (args[idx] == nil) then args[idx] = '  ' end             local img = image_square(args[idx]:match('%w%w') or , row, col, size, trans, flip, altprefix )             local bg = (((trow + tcol + flip) % 2) == 0) and '#ffce9e' or '#d18b47'             b = b .. '' .. img .. ''         end         if ( numbers_rt ) then b = b .. '' .. row .. '' end     end     if ( letters_bt ) then b = b .. letters_row(rev, numbers_lt, numbers_rt, cols) .. '\n' end      if footer:match('^%s*$')     then     else             caption = '' .. footer .. '\n'     end     b = '\n' .. b .. '\n'      if noframe then         return b     else         return ''         .. header .. '\n\n'          .. b .. '\n' .. caption .. ''     end      end  function convertFenToArgs( fen )     -- converts FEN notation to an array of positions, offset by 2     local res = {' ', ' '}     -- Loop over rows, which are delimited by /     for srow in string.gmatch("/" .. fen, "/%w+") do         -- Loop over all letters and numbers in the row         for piece in srow:gmatch( "%w" ) do             if (piece:match("%d")) then                 -- if a digit                 for k=1,piece do                     table.insert(res,' ')                 end             else                  -- not a digit                 local color = piece:match( '%u' ) and 'l' or 'd'                 piece = piece:lower()                 table.insert(res, piece .. color )             end         end     end      return res end  function p.board(frame)     local args = frame.args     local pargs = frame:getParent().args     local size = (args.size or pargs.size) or '26'     local reverse = (args.reverse or pargs.reverse or  ):lower() == "true"     local trans = (args.transparent or pargs.transparent or  ):lower() == "true"     local lightdark = (args.lightdark or pargs.lightdark or  ):lower() == "swap"     local altprefix = args.altprefix or pargs.altprefix or     local rows = args.rows or pargs.rows or 8     local cols = args.cols or pargs.cols or 8     local letters = ( args.letters or pargs.letters or 'both' ):lower()      local numbers = ( args.numbers or pargs.numbers or 'both' ):lower()      local header =  mw.ustring.gsub( args[2] or pargs[2] or , '^%s*(.-)%s*$', '%1' )     local footer = args[3 + rows*cols] or pargs[3 + rows*cols] or     local align = ( args[1] or pargs[1] or 'tright' ):lower()     local clear = ( args.clear or pargs.clear ) or ( align:match('tright') and 'right' or 'none' )     local noframe = (args.noframe or pargs.noframe or ):lower() == "true"     local fen = args.fen or pargs.fen      size = mw.ustring.match(size, '[%d]+') or '26' -- remove px from size     if (fen) then         align = ( args.align or pargs.align or 'tright' ):lower()         clear = ( args.clear or pargs.clear ) or ( align:match('tright') and 'right' or 'none' )         header = args.header or pargs.header or         footer = args.footer or pargs.footer or          return chessboard(convertFenToArgs( fen ), size, rows, cols, reverse, trans, lightdark, altprefix, letters, numbers, header, footer, align, clear, noframe)     end     if args[3] then         return chessboard(args, size, rows, cols, reverse, trans, lightdark, altprefix, letters, numbers, header, footer, align, clear, noframe)     else         return chessboard(pargs, size, rows, cols, reverse, trans, lightdark, altprefix, letters, numbers, header, footer, align, clear, noframe)     end      end  return p