The key to dealing with a square face is movement. You want to draw the attention of a viewer's eye to the entire head.

关键在于要将众人对你脸型的关注转移到头部这一整体。

youdao

You can draw a round face or a square face.

你可以画出圆脸或是方形脸。

youdao

Use the map controls in the bottom left corner to zoom in and out and move about, or you can use your mouse point to draw a square and zoom in on a specific area.

BBC: Netvibes website

If your opponent plays the center square, you can always force a draw, but if he plays anything else, you can win.

FORBES: How To Win At (Nearly) Everything