You make the call - double base

[tcannizzo]

I understand that a straight slide into 1B is a stretch, but without looking at the exact same play, this will be tough to resolve on a message board.

If the runner had swung wide as though advancing to 2B, perhaps betting that the ball would get RF, but then saw the throw coming in, I could see a slide into 1B and only getting white. (although I never agree with the strategy of sliding into 1B, except to avoid a tag).

My point is that the slide itself does not come into consideration in my ruling.