我在用Swing下国际象棋

对于电路板（JPanel），我使用new GridLayout(8, 8)，然后我添加64个方块（JPanel）。
在每个Square中，我有一个JLabel用于代数符号（A8，A7...），这个标签位置很好。
这个问题来自于包含片段图像的另一个JLabel，这个JLabel没有垂直居中，我如何才能将这个JLabel居中在Square中？
下面是Square的代码：

package org.victorpiles.escacs.client.gui;

import javax.imageio.ImageIO;
import javax.swing.*;
import javax.swing.border.EmptyBorder;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;

/**
 * @author Víctor Piles
 */
public class Square extends JPanel {
    private static final String PIECE_ICON_PATH = "client/src/main/resources/pieces/";

    private static final Color LIGHT_COLOR = new Color(118, 150, 86, 255);
    private static final Color DARK_COLOR = new Color(238, 238, 210, 255);

    private final int position;

    public Square(int position) {
        super(new BorderLayout());

        setAlgebraicNotationLabel(position);

        this.position = position;
        setBackground(getSquareColor(position));
    }

    private void setAlgebraicNotationLabel(int position) {
        JLabel squarePosition = new JLabel(getAlgebraicNotation(position));
        squarePosition.setBorder(new EmptyBorder(5, 5, 5, 5));
        add(squarePosition, BorderLayout.PAGE_END);
    }

    /**
     * Calcula el color adequat per a la casella, basant-se en la seua posició.
     *
     * @param position La posició de la casella.
     *
     * @return El color de la casella: {@link #LIGHT_COLOR clar} o {@link #DARK_COLOR fosc}.
     */
    private Color getSquareColor(int position) {
        int row = position / 8;
        int column = position % 8;

        return (row + column) % 2 != 0 ? LIGHT_COLOR : DARK_COLOR;
    }

    /**
     * Calcula la notació algebraica per a la casella, basant-se en la seua posició.
     *
     * @param position La posició de la casella.
     *
     * @return La notació algebraica per a la casella.
     */
    private String getAlgebraicNotation(int position) {
        int row = 8 - (position / 8);
        char column = (char) ('a' + (position % 8));

        return ("" + column + row).toUpperCase();
    }

    public void updatePiece(char piece) {
        removeAll();

        BufferedImage pieceImage;

        if (piece == '-') {
            return;
        }

        String fileName = PIECE_ICON_PATH + piece + ".png";
        try {
            pieceImage = ImageIO.read(new File(fileName));
            System.out.println(position + " -> " + pieceImage.getHeight());
        } catch (IOException e) {
            // TODO: 20/3/23 Manejar excepció
            throw new RuntimeException(e);
        }

        /* Actualitza la casella */
        setAlgebraicNotationLabel(position);
        add(new JLabel(new ImageIcon(pieceImage)));
        validate();
    }
}