Quiz 53: Find minimum number of moves by King to reach destination

Problem:

In a chess board, only 1 King is left. Given his current position and his destination position, find number of minimum moves, in which king can reach his destinations.
Valid moves are same as that of King in Chess Game.

Input Format: 

T(number of test cases)

Next T lines having initial position and destination position like a1 d7

Output Format: 
T lines having minimum number of moves

Constraints: 
None

Sample Input

5
a1 h8
e4 e4
c2 d5
e7 d2
h2 b1

Sample Output:
7
0
3
5
6

Explanations:
for c2 d5, moves can be c2-d3, d3-d4, d4-d5. So 3 moves minimum

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Solution:

chomp($t=<STDIN>);
for($i=0;$i<$t;$i++)
{
chomp($line=<STDIN>);
@arr=split(" ",$line);
$arr[0]=~ /(\w)(\d*)/;
$c1=ord($1);
$r1=$2;
$arr[1]=~ /(\w)(\d*)/;
$c2=ord($1);
$r2=$2;
if($c1>$c2)
{
$d1=$c1-$c2;
}
else
{
$d1=$c2-$c1;
}
if($r1>$r2)
{
$d2=$r1-$r2;
}
else
{
$d2=$r2-$r1;
}
if($d1>$d2)
{
push(@out,$d1);
}
else
{
push(@out,$d2);
}
}
foreach(@out)
{
print "$_\n";
}

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Tips:

Maximum (diff of rows, diff of columns)