Resolution 640x480 and less is enlarged 2 times

[Pixelsuft]

[copy]

This is intentional since these resolutions look too small, especially on high-dpi screens and OSes that don't support larger resolutions (e.g. bootchess, Windows without driver). Do you think this behaviour should be changed?

[Pixelsuft]

Maybe you need to change only if the browser window is not smaller than the resolution * 2?

[copy]

Fixed in #623.