# Generating Solvable Minesweeper Boards

## Is it possible to generate guaranteed solvable Minesweeper boards?

Yes, it's possible to generate guaranteed solvable Minesweeper boards. This is an important feature for ensuring a fair and enjoyable player experience. Let's explore how we can modify our current implementation to achieveÂ this.

## The Challenge

The main challenge in generating a solvable Minesweeper board is ensuring that the player never has to guess. Every move should be logically deducible from the information available on theÂ board.

## Solution Approach

To generate a solvable board, we can use a combination ofÂ techniques:

1. Start with an empty board and place mines after the first click.
2. Ensure the first clicked cell and its neighbors are free of mines.
3. Use a solver algorithm to verify the board's solvability.

Let's implement a simple version of thisÂ approach:

#include <algorithm>
#include <iostream>
#include <random>
#include <vector>

class MinesweeperBoard {
public:
MinesweeperBoard(int rows, int cols,
int mines) :
rows{rows},
cols{cols}, mineCount{mines},
board(rows, std::vector<int>(cols, 0)) {}

void generateSolvableBoard(int startRow,
int startCol) {
// Clear the 3x3 area around the first click
for (int i = std::max(0, startRow - 1);
i <= std::min(rows - 1, startRow + 1);
++i) {
for (int j = std::max(0, startCol - 1);
j <=
std::min(cols - 1, startCol + 1);
++j) {
board[i][j] = -1; // Mark as safe
}
}

// Place mines randomly on the remaining
// cells
std::vector<std::pair<int, int>>
availableCells;
for (int i = 0; i < rows; ++i) {
for (int j = 0; j < cols; ++j) {
if (board[i][j] != -1) {
availableCells.emplace_back(i, j);
}
}
}

std::random_device rd;
std::mt19937 g(rd());
std::shuffle(availableCells.begin(),
availableCells.end(), g);

for (int i = 0; i < mineCount &&
i < availableCells.size();
++i) {
auto [row, col] = availableCells[i];
board[row][col] =
9; // 9 represents a mine
}

for (int i = 0; i < rows; ++i) {
for (int j = 0; j < cols; ++j) {
if (board[i][j] != 9) {
board[i][j] =
}
}
}
}

void printBoard() {
for (const auto &row : board) {
for (int cell : row) {
if (cell == 9) {
std::cout << "* ";
} else {
std::cout << cell << " ";
}
}
std::cout << "\n";
}
}

private:
int rows, cols, mineCount;
std::vector<std::vector<int>> board;

int countAdjacentMines(int row, int col) {
int count = 0;
for (int i = std::max(0, row - 1);
i <= std::min(rows - 1, row + 1);
++i) {
for (int j = std::max(0, col - 1);
j <= std::min(cols - 1, col + 1);
++j) {
if (board[i][j] == 9) { ++count; }
}
}
return count;
}
};

int main() {
MinesweeperBoard board(8, 8, 10);
// Assume first click at (3,3)
board.generateSolvableBoard(3, 3);
board.printBoard();
}

This implementation ensures that the first click and its surrounding cells are safe, which gives the player a good starting point. However, this doesn't guarantee full solvability for complexÂ boards.

For a more robust solution, you'd need to implement a solver algorithm and regenerate the board if it's notÂ solvable.

Remember, generating perfectly solvable boards can be computationally expensive, especially for larger grids. You might need to balance between generation time and perfect solvability based on your game'sÂ requirements.

This Question is from the Lesson:

### Adjacent Cells and Bomb Counting

Implement the techniques for detecting nearby bombs and clearing empty cells automatically.

Answers to questions are automatically generated and may not have been reviewed.

This Question is from the Lesson:

### Adjacent Cells and Bomb Counting

Implement the techniques for detecting nearby bombs and clearing empty cells automatically.

Part of the course:

## Game Dev with SDL2

Learn C++ and SDL development by creating hands on, practical projects inspired by classic retro games

Free, unlimited access

### This course includes:

• 44 Lessons
• 100+ Code Samples
• 91% Positive Reviews
• Regularly Updated
• Help and FAQ
Free, Unlimited Access

### Professional C++

Comprehensive course covering advanced concepts, and how to use them on large-scale projects.