Engine generates illegal move

[Torom]

Hey, this is the first time I've played around with the engine, so it's quite possible I did something wrong.

But I've played to the point where the board looks like this:

showboard
=
    A   B   C   D   E   F   G   H   I 
  +---+---+---+---+---+---+---+---+---+
9 |   |   H   |   |   |   |   |   |   | 9  Black walls: 0
  +=======H---+=======+---+---+---+---+
8 |   H   H   |   |   |   |   |   |   | 8  White walls: 1
  +---H---+=======+=======+---+---+---+
7 |   H   |   |   H W |   H   |   |   | 7  
  +---+---+---+---H---+---H---+---+---+
6 |   |   |   | B H   H   H   |   |   | 6  
  +---+=======+---+---H---+---+---+---+
5 |   H   |   |   |   H   H   |   |   | 5  
  +---H---+=======+=======H---+---+---+
4 |   H   |   |   |   |   H   |   |   | 4  
  +---+=======+=======+=======+---+---+
3 |   |   |   |   |   |   |   |   |   | 3  
  +---+---+---+---+---+---+---+---+---+
2 |   |   |   |   |   |   |   |   |   | 2  
  +=======+=======+---+---+---+---+---+
1 |   |   |   |   |   |   |   |   |   | 1  
  +---+---+---+---+---+---+---+---+---+
    A   B   C   D   E   F   G   H   I

It's white's move, so I enter genmove white. The result is = A1. Which makes the board look like this:

showboard
=
    A   B   C   D   E   F   G   H   I 
  +---+---+---+---+---+---+---+---+---+
9 |   |   H   |   |   |   |   |   |   | 9  Black walls: 0
  +=======H---+=======+---+---+---+---+
8 |   H   H   |   |   |   |   |   |   | 8  White walls: 1
  +---H---+=======+=======+---+---+---+
7 |   H   |   |   H   |   H   |   |   | 7  
  +---+---+---+---H---+---H---+---+---+
6 |   |   |   | B H   H   H   |   |   | 6  
  +---+=======+---+---H---+---+---+---+
5 |   H   |   |   |   H   H   |   |   | 5  
  +---H---+=======+=======H---+---+---+
4 |   H   |   |   |   |   H   |   |   | 4  
  +---+=======+=======+=======+---+---+
3 |   |   |   |   |   |   |   |   |   | 3  
  +---+---+---+---+---+---+---+---+---+
2 |   |   |   |   |   |   |   |   |   | 2  
  +=======+=======+---+---+---+---+---+
1 | W |   |   |   |   |   |   |   |   | 1  
  +---+---+---+---+---+---+---+---+---+
    A   B   C   D   E   F   G   H   I