/// <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);
}