Using too much ram and causing lag after clicking a few buttons

Unity Engine
1 
using UnityEngine;
[CreateAssetMenu(menuName = "ChessData/Pieces")]

public class Pieces : ScriptableObject
{
    public string xcord;
    public string ycord;
    public Sprite msprite;
    public string piecetype;
    public string pside;
    public string startxcord;
    public string startycord;
}

using System;
using UnityEngine;
using UnityEngine.UI;

public class PieceMove : MonoBehaviour
{
    public GeneralBehaviour sc;
    private Image tempimage;
    private Pieces movingpiece;
    private int ttimer;
    public bool notoccupied;

    public void Move(Pieces p, string cord)
    {
        p.xcord = cord[0].ToString();
        p.ycord = cord[1].ToString();
        sc.UpdateImg();
    }

    public void MoveType(string cord)
    {
        
        movingpiece = sc.pieces.Find(x => (x.xcord + x.ycord) == cord);
        GameObject tempsquare = sc.squares.Find(x => x.name == (cord));
        Debug.Log(movingpiece.name);
        tempsquare.GetComponent<Button>().onClick.AddListener(() => CancelMove(tempsquare));

        int tempxcord = Convert.ToInt32(movingpiece.xcord); int tempycord = Convert.ToInt32(movingpiece.ycord); 
        switch (movingpiece.piecetype)
        {
            case "rook":
                TempMove(tempxcord, tempycord, "01");
                TempMove(tempxcord, tempycord, "02");
                TempMove(tempxcord, tempycord, "10");
                TempMove(tempxcord, tempycord, "20");
                break;
            case "horse":
                Check(tempxcord + 1, tempycord + 2);
                Check(tempxcord + 1, tempycord - 2);
                Check(tempxcord - 1, tempycord - 2);
                Check(tempxcord - 1, tempycord + 2);
                Check(tempxcord + 2, tempycord + 1);
                Check(tempxcord + 2, tempycord - 1);
                Check(tempxcord - 2, tempycord + 1);
                Check(tempxcord - 2, tempycord - 1);
                break;
            case "bishop":
                TempMove(tempxcord, tempycord, "11");
                TempMove(tempxcord, tempycord, "12");
                TempMove(tempxcord, tempycord, "21");
                TempMove(tempxcord, tempycord, "22");
                break;
            case "pawn":
                switch (movingpiece.pside)
                {
                    case "w":
                        if (movingpiece.ycord == "2") { Check(tempxcord, tempycord + 2); }
                        Check(tempxcord, tempycord + 1);
                        break;
                    case "b":
                        if (movingpiece.ycord == "7") { Check(tempxcord, tempycord - 2); }
                        Check(tempxcord, tempycord - 1);
                        break;
                }
                break;
            case "king":
                Check(tempxcord + 1, tempycord);
                Check(tempxcord, tempycord + 1);
                Check(tempxcord + 1, tempycord + 1);

                Check(tempxcord - 1, tempycord);
                Check(tempxcord, tempycord - 1);
                Check(tempxcord - 1, tempycord - 1);

                Check(tempxcord + 1, tempycord - 1);
                Check(tempxcord - 1, tempycord + 1);
                break;
            case "queen":
                TempMove(tempxcord, tempycord, "11");
                TempMove(tempxcord, tempycord, "12");
                TempMove(tempxcord, tempycord, "21");
                TempMove(tempxcord, tempycord, "22");
                TempMove(tempxcord, tempycord, "01");
                TempMove(tempxcord, tempycord, "02");
                TempMove(tempxcord, tempycord, "10");
                TempMove(tempxcord, tempycord, "20");
                break;
        }
    }

    private void TempMove(int xx, int yy, string id)
    {
        notoccupied = true;
        switch(id)
        {
            case "01":
                for (int ttimer = 1; notoccupied && ttimer <= 8; ttimer++) { Check(xx, yy + ttimer); }
                break;

            case "10":
                for (int ttimer = 1; notoccupied && ttimer <= 8; ttimer++) { Check(xx + ttimer, yy); }
                break;

            case "11":
                for (int ttimer = 1; notoccupied && ttimer <= 8; ttimer++) { Check(xx + ttimer, yy + ttimer); }
                break;

            case "21":
                for (int ttimer = 1; notoccupied && ttimer <= 8; ttimer++) { Check(xx - ttimer, yy + ttimer); }
                break;

            case "12":
                for (int ttimer = 1; notoccupied && ttimer <= 8; ttimer++) { Check(xx + ttimer, yy - ttimer); }
                break;

            case "20":
                for (int ttimer = 1; notoccupied && ttimer <= 8; ttimer++) { Check(xx - ttimer, yy); }
                break;

            case "02":
                for (int ttimer = 1; notoccupied && ttimer <= 8; ttimer++) { Check(xx, yy - ttimer); }
                break;

            case "22":
                for (int ttimer = 1; notoccupied && ttimer <= 8; ttimer++) { Check(xx - ttimer, yy - ttimer); }
                break;
        }

    }

    public void CancelMove(GameObject sq)
    {
        sq.GetComponent<Button>().onClick.RemoveAllListeners();
        sc.showsquares.Clear();
        sc.UpdateImg();
    }
    private void Check(int xcord, int ycord) 
    {
        if (1 <= xcord && xcord <= 8 && 1 <= ycord && ycord <= 8) 
        {
            string tempcord = xcord.ToString() + ycord.ToString();
            Pieces p = sc.pieces.Find(x => (x.xcord + x.ycord) == (tempcord));
            if (p == null) { ShowMove(tempcord);  } else { Debug.Log(tempcord + "occupied"); notoccupied = false; }
        }
    }

    private void ShowMove(string cord)
    {
        GameObject tempsquare = sc.squares.Find(x => x.name == cord);
        tempimage = tempsquare.GetComponent<Image>();
        sc.UpdateImg();
        sc.showsquares.Add(tempsquare);
        tempsquare.GetComponent<Button>().onClick.AddListener(() => Move(movingpiece, cord));
    }
}

using System;
using System.Collections.Generic;
using TMPro;
using UnityEngine;
using UnityEngine.UI;

public class GeneralBehaviour : MonoBehaviour
{
    public List<GameObject> squares;
    public List<GameObject> showsquares;
    public GameObject squareparent;
    public List<Pieces> pieces;
    private Image tempimage;
    public Sprite empty;
    public Sprite tempsprite;
    public PieceMove pm;

    void Start()
    {
        Screen.SetResolution(720, 720, false);
        PieceReset();
        UpdateImg();
    }
    public void UpdateImg()
    {
        for (int a = 0; a < squares.Count; a++)
        {
            GameObject tempsquare = squares[a];
            tempimage = tempsquare.GetComponent<Image>();
            tempimage.GetComponent<Image>().sprite = empty;
            tempsquare.GetComponent<Button>().interactable = false;
        }

        for (int a = 0; a < showsquares.Count; a++)
        {
            GameObject tempsquare = showsquares[a];
            tempimage = tempsquare.GetComponent<Image>();
            tempsquare.GetComponent<Image>().sprite = tempsprite;
            tempsquare.GetComponent<Button>().interactable = true;
        }

        for (int i = 0; i < pieces.Count; i++)
        {
            String piececord = pieces[i].xcord + pieces[i].ycord;
            GameObject tempsquare = squares.Find(x => x.name == (piececord));
            tempimage = tempsquare.GetComponent<Image>();
            tempsquare.GetComponent<Image>().sprite = pieces[i].msprite;
            tempsquare.GetComponent<Button>().onClick.AddListener(() => pm.CancelMove(tempsquare));
            tempsquare.GetComponent<Button>().onClick.AddListener(() => pm.MoveType(piececord));
            tempsquare.GetComponent<Button>().interactable = true;
        }
    }    

    private void PieceReset()
    {
        for (int i = 0; i < pieces.Count; i++)
        {
            pieces[i].xcord = pieces[i].startxcord; pieces[i].ycord = pieces[i].startycord;
        }
    }
}

After a few calls of MoveType() by clicking on chess pieces, Unity Editor increases its ram usage and freezes. I tried to remove the DataType Type = new DataType; kind of lines to decrease the creation of new lists/gameobjects to avoid lag, but it continues. Thanks for replies in advance.