How to use TrySkipTurn / UndoSkipTurn

[artm]

I have attempted to use them to count legal turns / threats by the opponent like:

        if (board.TrySkipTurn()){
            // their mobility/threats will only be deducted when we're not in
            // check, but when we are our mobility is mostly decreased anyway
            score -= board.GetLegalMoves().Length + board.GetLegalMoves(true).Length;
            board.UndoSkipTurn();
        }

this mostly seems to work except once in a while my bot now attempts to make an illegal move elsewhere in the code. Am I using it wrong?

I'll be testing my bot without this fragment now, to find out if it was in fact this code that caused to bot to get confused.

[artm]

My bot has just made an illegal move with this fragment commented out, I guess this wasn't the culprit.