[oldstrangers]

From my other comment: If I was Bill I would've played a very passive game, shutting down the middle of the board as quickly as possible. Create as complex a middle game as possible, and let Carslen go all in on sacrifices or whatever he'd need to do to break the board open. Deny as many exchanges as possible, win on time.

Carlsen quickly realized Bill was a push over and started parking all his pieces on white's kingside as quickly as possible. Bill basically played as poorly as could be expected. To get mated in 9 moves means you've basically forced yourself to lose.

[tedsanders]

But to execute this strategy well, Bill would have to be much better than he is. Carlsen will crush Bill every time, even if Bill knows ahead of time to play a passive, closed position.

[oldstrangers]

Yes, basically Bill is very bad at chess.