TITLE: What is the highest number that can be got from 4383 by moving exactly 2 matches?
QUESTION [6 upvotes]: What is the highest number that can be got from 4383 by moving exactly 2 matches?
Number 1 has got 2 matches, so I thought it will be 47831 as I remove two matches from second number (3), but it isn't the highest possible.
Format is same like this (1 is only number with only two matches)

Does anybody know solution?

REPLY [8 votes]: Tetration notation:
      _   _  _
  |_| _| |_| _|
    | _| |_| _|

      _   _  
  |_| _| |_| _
    | _| |_||_|
              |

or (if that's not a valid $9$),
      _   _  
  |_| _| |_| _
    | _| |_| _|
             _|

$^{438}3= 3^{3^{\cdot^{\cdot^{3^3}}}}$ (an exponential tower with $438\ \ 3$s).