Unity Gobang Game Design and Simple AI (2)

Above we have realized the basic functions of basic gobang playing, this time we will judge the winning and losing conditions of gobang.The logic is as follows: after each chess game, check the chess piece in 8 directions. If there are chess pieces of the same type, continue to judge along the chess pieces until there are 5 pieces.After introducing the basic idea, let's talk about how to implement it.

1 first checks a line of code: set an offset to offset, and two loops detect the positive and negative pawns of each store respectively.When num=5, stop the game and declare the game over.In the loop, pay attention to set, x, y respectively pos plus offset offset.The loop condition is that x and y are both less than 15 and greater than 0.Add an offset each time through the loop.(offset = move one space in a certain direction)

 public void CheckOneLine(int[]pos, int[] offset){intNum = 1;for (int x = pos[0] + offset[0], y = pos[1] + offset[1]; (x<15&&x>0&&y<15&&y>0); x += offset[0], y +=offset[1]){if (grid[x, y] == (int)turn){Num += 1;}else break;}for (int x = pos[0] - offset[0], y = pos[1] - offset[1]; (x < 15 && x > 0 && y < 15 && y > 0); x -= offset[0], y -= offset[1]){if (grid[x, y] == (int)turn){Num += 1;}else break;}if (Num == 5){GameStart = false;Debug.Log("Game over");}}

2 The following code is for the detection of 8 directions of a chess piece. Since each detection already includes positive and negative 2 directions, then only four directions (left, up, diagonally upper right, diagonally upper left) need to be detected.That's it.

public void CheckWinner(int[] pos){CheckOneLine(pos, new int[2] { 0, 1 });CheckOneLine(pos, new int[2] { 1, 0 });CheckOneLine(pos, new int[2] { 1, 1 });CheckOneLine(pos, new int[2] { 1, -1 });}

3 Put the checkWinner method in the player's method of playing chess, pay attention to the position, and check the pieces after the grid is assigned a value.

 public void Play(int[] pos){if (grid[pos[0], pos[1]]!=0||GameStart==false)return;if (turn == ChessType.Black){Instantiate(prefabs[0], new Vector3(pos[0], pos[1], 0), Quaternion.identity);grid[pos[0], pos[1]] = (int)ChessType.Black;CheckWinner(pos);turn = ChessType.White;}else if (turn == ChessType.White){Instantiate(prefabs[1], new Vector3(pos[0], pos[1], 0), Quaternion.identity);grid[pos[0], pos[1]] = (int)ChessType.White;CheckWinner(pos);turn = ChessType.Black;}

4 As shown in the figure below, we have completed the basic logic of Unity Gobang victory judgment.

5 The idea of ​​​​repentance: We can create a new stack to save the position of each chess game. When we want to regret a chess move, we can directly pop the last chess piece from the stack and destroy it.The code is not posted here, and interested readers can try to complete the function of repentance by themselves.

If you have other ideas, you are welcome to discuss and exchange. There are not many things used in this article, it is very simple.At the end I will publish the source code of the complete project for readers' reference.

Gobang originated in China, one of the competitive events, is a pure strategy chess game for two players.The two sides use black and white chess pieces respectively, and place them on the intersection of the straight line and the horizontal line of the chessboard.

Link above: Unity Gobang function and simple AI implementation (1)

https://blog.csdn.net/makise2333/article/details/126069263​​​​​​​​