/// <summary>
 /// Remember field on which pawn start move
 /// </summary>
 /// <param name="pawn">Pawn which moving</param>
 public void StartHolding(GameObject pawn)
 {
     startPosition = pawn.transform.localPosition;
     posStartX     = board.CalculateFieldX(startPosition.x);
     posStartY     = board.CalculateFieldY(startPosition.y);
 }