Position validity
When the mate search is launched, Problemist automatically checks whether the position is correct. If the position is incorrect or doubtful, a message explaining the first error encountered by Problemist is displayed. Fatal errors that will prevent any searches are the following:
 | No black or white king |
 | More than one black or white king |
 | Pawns on promotion squares |
 | Black king in an apparent chess position (if the "Actual Play" or "Try Play" option is active) |
 | The position is too complicated. |
However, the following errors will lead to a simple warning message but will not hamper the mate search:
 | More than 16 white or black pieces |
 | More than 8 black or white pawns |
 | Promotion pieces |
 | More than one bishop of the same color on squares of the same color. |
The "Modified position" message appears when the solution is displayed if the position has been modified since the last search.
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