Harry Potter and the Methods of Rationality

Only it's not, Harry Potter's voice whispered inside Draco's mind. It's easy to forget what's really true, Draco, once you start trying to win at politics. But in reality there's only one thing that makes you a wizard, remember?

Draco knew, then, he knew the reason for the disquiet in the back of his mind, as he stared at the blank wall above his desk contemplating his forced move. It should've been simple - when you only had one move, the thing to do was make it - but -

Granger whirling, spinning, sweat-dampened hair flying around her, bolts flying from her wand as fast as his own, jinx and counter-jinx, glowing bats flying at his face, and through all of it the look of fury in Granger's eyes -

There'd been a part of him admiring that, before it had all gone wrong, admiring Granger's fury and power; a part of him that had exulted in the first real fight he'd ever been in, against...

...his first equal opponent.

If he challenged Granger, and lost...

It ought not to be possible, Draco had gotten his wand two full years before anyone else in his Hogwarts class.

Only there was a reason why they usually didn't bother giving wands to nine-year-olds. Age counted too, it wasn't just how long you'd held a wand. Granger's birthday had been only a few days into the year, when Harry had bought her that pouch. That meant she was twelve now, that she'd been twelve almost since the start of Hogwarts. And the truth was, Draco hadn't been practicing much outside of class, probably not nearly as much as Hermione Granger of Ravenclaw. Draco hadn't thought he needed any more practice to stay ahead...

And Granger was exhausted too, whispered the Voice of Contrary Evidence inside him. Granger must have been exhausted from all those Stunning Hexes, and even in that state she'd been able to undo his Locking Charm.

And Draco could not afford to challenge Granger publicly, one-on-one with no excuses, and lose.

Draco knew what you were supposed to do in this sort of situation. You were supposed to cheat. But if anyone discovered Draco cheating, it would be disastrous, perfect blackmail material even if it never got out publicly, and any Slytherins watching would know that, they'd be looking...

And then, if you were watching, you would have seen Draco Malfoy get up from his bed, and go to his desk, and take out a sheet of the finest sheepskin parchment, and a pearl-carven inkwell, filled with greenish-silver ink that had been made with true silver and crushed emeralds. From the great trunk at his bed's foot, the Slytherin drew forth a book bound also in silver and emeralds, entitled The Etiquette of the Houses of Britain. And with a new, clean quill, Draco Malfoy began to write, frequently looking to the book where it lay open as a reference. There was a grim smile on the boy's face, making the young Malfoy look very much like his father, as he carefully drew each letter as though it were a separate artwork.

From Draco, son of Lucius son of Abraxis Lords of the Noble and Most Ancient House of Malfoy, son also of Narcissa daughter of Druella Lady of the Noble and Most Ancient House of Black, scion and heir of the Noble and Most Ancient House of Malfoy:

To Hermione, the first Granger:

(That form might have been meant to sound polite, long ago when it had been invented; nowadays, after centuries of being used to address mudbloods, it carried a lovely tinge of refined venom.)

I, Draco, of Most Ancient House, demand redress, for

Draco paused, carefully moving the quill aside so that it wouldn't drip. He needed a pretext for this, at least if he wanted to impose the duel's conditions. The challenged had the choice of terms, unless they had insulted a Noble House. He needed to make it look like Granger had insulted him...

What was he thinking? Granger had insulted him.

Draco flipped the book to the page of standard formulae, and found one that seemed appropriate.