Derby can only catch Reading though.
They need to win 3 out of the last 4 remaining games to go level on points, with a far superior goal difference.
That is if Reading do not collect any more points, if Reading just win 1 point Derby need to then win 3 and draw 1 to go level, with a far superior goal difference.
If Reading win another 2/3 points, Derby then have to win all 4 games.
Big ask, not impossible but a Big ask.