What is the Google Chrome keyboard shortcut to pin/unpin a tab?

After a little bit googling around, it seems there is none.

But you can select pin with P and unpin with U at the right click of tab's context menu.
Not handy at all.

Additionally, I found an extension named ~~URL Pinner~~ with some useful features like auto pinning URL with regex matching, syncing settings etc.

Edit:

Apparently, the extension is gone from Chrome Web Store at least for now.

I'll try to curate some similar alternatives here:

Tab Pinner (credit goes to Brandon Søren Culley, he suggested this in the comments down below)
Keyboard Shortcuts to Close Other/Right Tabs (this is what I use for a while now and I'm very happy with it. Although it contains few more features and focuses than just pinning the tab, furthermore it can also handle pinning very well)

Untested alternatives:

Here is the one which works for me on Ubuntu Linux and Max OS X:

ALT + P

Note: Strangely it doesn't work on all websites eg. www.github.com www.google.com www.youtube.com.

But there is a fix: .

Install Chrome extension "Shortkeys (Custom Keyboard Shortcuts)",
Open chrome settings,
Select extensions,
Find new extension: Shortkeys (Custom Keyboard Shortcuts),
Click on options and "Custom Keyboard Shortcuts" Options page will open,
Linux users: type your shortcut in "Keyboard Shortcut" field (eg. type: alt+p, ctrl+p),
MaxOS users type (eg. type: option+p, control+p, command+p) in the same field,
Select behavior Pin/unpin tab,
Click on "Activation Settings..." and check "Active while in form fields",
Select "All Websites" in Website list,
Click Save and RESTART Chrome for changes to take effect.