From 25f99b9447ce6b31469c4779cf5e43556c2735ce Mon Sep 17 00:00:00 2001
From: uohlhv <acbebq@yanknil.com>
Date: Sat, 25 Apr 2026 21:14:34 +0800
Subject: [PATCH] Support expanding a uncovered tile surrounded by unflagged
 tiles.

---
 src/Board.java | 15 +++++++++++++++
 src/Tile.java  |  3 +++
 2 files changed, 18 insertions(+)

diff --git a/src/Board.java b/src/Board.java
index 8ced168..47594cd 100644
--- a/src/Board.java
+++ b/src/Board.java
@@ -115,6 +115,21 @@ public class Board extends JPanel {
     setVisible(true);
   }
 
+  public int getTileFlaggedNum(int row, int col) {
+    int counter = 0;
+    for (int i = row - 1; i <= row + 1; i += 1) {
+      for (int j = col - 1; j <= col + 1; j += 1) {
+        if (!(i < 0 || j < 0 || i >= this.height || j >= this.width) && !(i == row && j == col)) {
+          Tile tile = this.tiles[i][j];
+          if (tile.isFlagged()) {
+            counter += 1;
+          }
+        }
+      }
+    }
+    return counter;
+  }
+
   public void showMines() {
     setVisible(false);
     for (int i = 0; i < this.height; i += 1) {
diff --git a/src/Tile.java b/src/Tile.java
index 3f0aa05..3e90b9f 100644
--- a/src/Tile.java
+++ b/src/Tile.java
@@ -169,6 +169,9 @@ public class Tile extends JLabel implements MouseListener {
     }
     if (SwingUtilities.isLeftMouseButton(e) && !this.uncovered && !this.flagged) {
       this.setTileIcon("0");
+    } else if (this.isUncovered() && e.getClickCount() == 2 && SwingUtilities.isLeftMouseButton(e) &&
+               this.getValue() == this.board.getTileFlaggedNum(row, col)) {
+      this.board.expand(row, col);
     } else if (SwingUtilities.isMiddleMouseButton(e)) {
       if (!this.flagged) {
         this.setTileIcon("0");