Theresa May has thrown the dice up in the air tonight

I have given up trying to understand Theresa May.

I used to think she was the most methodical and risk-averse of politicians.

But she has tonight thrown the dice up in the air – or perhaps, to use George Osborne’s analogy, pointed the loaded revolver at herself.

Because she is whipping for the Brady amendment that calls on her to rip up the backstop and replace it with unspecified alternative arrangements to keep open the border on the island of Ireland.