//check the result of trading two puzzle pieces positions
public void CheckTradePieces(PuzzlePiece pieceA, PuzzlePiece pieceB)
{
int oldIndexA = pieceA.puzzlePiecesIndex;
int oldIndexB = pieceB.puzzlePiecesIndex;
bool oldCorrectPosA = pieceA.GetPieceIsInCorrectPosition();
bool oldCorrectPosB = pieceB.GetPieceIsInCorrectPosition();
pieceA.puzzlePiecesIndex = oldIndexB;
pieceB.puzzlePiecesIndex = oldIndexA;
puzzlePiecesList[pieceA.puzzlePiecesIndex] = pieceA;
puzzlePiecesList[pieceB.puzzlePiecesIndex] = pieceB;
CheckExchangeOfPiecesPosition(pieceA, oldCorrectPosA);
CheckExchangeOfPiecesPosition(pieceB, oldCorrectPosB);
}
