misc2

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  Deduction or Guess?
  
       1         2         3          4         5         6          7         8         9       
  .---------.---------.---------..---------.---------.---------..---------.---------.---------.  
a |         |         |         ||         |         |         ||         |         |         | a
b |         |         |         ||         |         |         ||         |         |         | b
c |         |         |         ||         |         |         ||         |         |         | c
  |---------+---------+---------++---------+---------+---------++---------+---------+---------|  
d |         | 23      |         ||         |         |         ||         | 23      |         | d
e | 23      |         |         ||         |         |         || 23      |         |         | e
f |         |         |         ||         |         |         ||         |         |         | f
  |---------+---------+---------++---------+---------+---------++---------+---------+---------|  
g | 2 4     |      78 |         ||         |         |      78 ||         | 2 4     |         | g
h |  34     |  3    8 |         ||         |         |   4   8 ||         |         |         | h
i |         | 23   7  |         ||         |         |   4  7  || 23      | 234     |         | i
  '---------'---------'---------''---------'---------'---------''---------'---------'---------'  
       1         2         3          4         5         6          7         8         9       

  d8 = 2 => d2 = 3 => e1 = 2 => g1 = 4 => g8 = 2 => 
  d8 = 3; this is a contradiction.

  So, is this a deduction or a guess?