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Are you sure that is the case jxvn? The move generation algorithm does not take into account wether or not the move results in a checkmate until the move is made. Could it be that there was a discovered check pinning your attacking piece? In any case I will take a look at the code right now.

The board looked like this (I reconstructed the position using a virtual chess board)


I wanted to move Queen to F7, but it wouldn't let me - the only highlighted square was G3.

If the picture in my reply doesn't show up, here:

1| Ro    Bi Qu Ki Bi    Ro
2| Pa Pa Pa Pa Kn Pa Pa Pa
3|       Kn
4|             Pa
5|       Bi    Pa
6|                Qu
7| Pa Pa Pa Pa    Pa Pa Pa
8| Ro Kn Bi    Ki    Kn Ro
   -----------------------
   A  B  C  D  E  F  G  H

(Bold is black, Italic is White)

Thank you for posting this. I will run this position in my chess engine to see if it is a problem with the engine or with the code I wrote to interact my engine in this game. I am guessing it is the later.