Take a new page ( Ctrl + N ) To unlock the background layer, double click the 'Background layer' Rectangular Marquee Tool (M) or Press M from Keyboard. To take a new layer, press Ctrl + Shift + N Do not hurry, Take your time, nice and easy. To remove selection press Ctrl + D Ctrl + Shift + N To color it black, press Alt + Backspace To merge, you can press Ctrl + E To copy a layer, press Ctrl + J Repeat the step two more time To selectr the layer more than one, press "Ctrl" key and left click the layer. To copy again, Ctrl + J To transform the entire layer, You can press Ctrl + T. rotate 180 degree, and press Enter. Repeat the step Two more times. Chess Board is ready. Thanks for watching it.