iframewidth = 200 .. 1000 default: 300 The iframewidth command is only used by the htmltype = iframe and muliframe pages. It is used to set the width of the IFRAME itself. You can expect most of your visitors to be using a screen width of 800, since this is still the most common screen resolution that is being used today. FIDE's statistics show that about 50% of all their visitors are using a screen resolution of 800x600, while about 32% are using 1024x768. All the other screen resolutions in use are marginal at best. We recommend that you set the iframewidth as if all of your visitors are using a screen resolution of 800x600. Try to use most of that width and then let the browser 'center' the entire table. This way your page will look good even on a higher resolution screen. Very few of your visitors will be using a screen resolution less than 800. For these few visitors they will see a horizontal scrollbar at the bottom of the page so that they can scroll the screen left and right. When calculating the iframewidth, please keep in mind that the chess board's <TD> cell is given a width of 10 × pcsize. So if you are using the standard 29px set, this cell's width will be 290. This will leave you about 800 - 290 = 510 left to play with (or approximately 500). You should always try your page in the browser before uploading it to your server, just to make sure that you are happy with the iframewidth.
    FIDE Display Statistics:

    800x600      51.47%
    1024x768     31.96%
    640x480       6.12%
    1280x1024     4.42%
    1152x864      2.59%
    Other         3.44%