public reversi make_move(possible_move move)
{
reversi result = new reversi(this.black, this.white);
result.parent = this;
var self = result.black;
var enemy = result.white;
if (move.color) //white
{
self = result.white;
enemy = result.black;
}
int st = 0;
if (move.color)
{
st = 1;
}
result.state[move.pos] = st;
self.Add(move.pos);
foreach (int x in move.flipped)
{
result.state[x] = st;
self.Add(x);
enemy.RemoveAt(enemy.FindIndex(a => a == x));
}
return(result);
}
public possible_move ai_make_move(int limit)
{
var frontier = get_frontier(false);
int[] h = new int[frontier.Count];
int i = 0;
foreach (var m in frontier)
{
reversi child = make_move(m);
h[i] = alphabeta(child, limit, -10000, 10000, false);
++i;
}
possible_move result = frontier[0];
int g = h[0];
for (int j = 1; j < frontier.Count; ++j)
{
if (h[j] > g)
{
result = frontier[j];
g = h[j];
}
else if (h[j] == g)
{
Random random = new Random();
if (random.NextDouble() > 0.5)
{
g = h[j];
}
}
}
return(result);
}
private void cellClick(object sender, EventArgs e)
{
if (!humans_turn)
{
return;
}
PictureBox p = sender as PictureBox;
int tag = (int)p.Tag;
if (frontier.Find(f => f.pos == tag).flipped == null) // not a valid move
{
return;
}
foreach (var x in frontier)
{
board[x.pos].BackgroundImage = null;
board[x.pos].Refresh();
}
game = game.make_move(frontier.Find(f => f.pos == tag));
display_state();
computer_score.Text = game.black.Count.ToString();
your_score.Text = game.white.Count.ToString();
Computer:
humans_turn = false;
turn.Text = "Computer's turn!";
turn.ForeColor = Color.Maroon;
turn.Invalidate();
turn.Update();
computer_move();
display_state();
computer_score.Text = game.black.Count.ToString();
your_score.Text = game.white.Count.ToString();
frontier = game.get_frontier(true);
if (frontier == null)
{
if (game.game_over())
{
gameover();
return;
}
MessageBox.Show("you have no moves"); //you have no moves
goto Computer;
}
foreach (var x in frontier)
{
board[x.pos].BackgroundImage = Properties.Resources.hint;
}
humans_turn = true;
turn.Text = "Your turn!";
turn.ForeColor = Color.Green;
}
int alphabeta(reversi st, int depth, int α, int β, bool maximizing_player)
{
var frontier = st.get_frontier(maximizing_player);
if (depth == 0 || frontier == null)
{
return(st.eval_state(maximizing_player));
}
possible_move bm;
if (!maximizing_player)
{
int v = -100000;
foreach (var pos in frontier)
{
bm = pos;
reversi child = st.make_move(pos);
v = Math.Max(v, st.alphabeta(child, depth - 1, α, β, !maximizing_player));
α = Math.Max(α, v);
if (β <= α)
{
break;// (*β cut - off *)
}
}
return(v);
}
else
{
int v = 100000;
foreach (var pos in frontier)
{
bm = pos;
reversi child = st.make_move(pos);
v = Math.Min(v, st.alphabeta(child, depth - 1, α, β, !maximizing_player));
β = Math.Min(β, v);
if (β <= α)
{
break;// (*β cut - off *)
}
}
return(v);
}
}
private void reset()
{
game = new reversi();
computer_score.Text = game.black.Count.ToString();
your_score.Text = game.white.Count.ToString();
for (int i = 0; i < 64; ++i)
{
board[i].BackgroundImage = null;
///////////////////////////////////////////////////////////////////////////
//board[i].Image = new Bitmap(board[i].Width, board[i].Height);
//using (Font myFont = new Font("Arial", 14))
//{
// Bitmap b = board[i].Image as Bitmap;
// Graphics g = Graphics.FromImage(b);
// g.DrawString(board[i].Tag.ToString(), myFont, Brushes.Green, new Point(2, 2));
//}
////////////////////////////////////////////////////////////////////////////
}
foreach (var x in game.black)
{
board[x].BackgroundImage = Properties.Resources.black;
}
foreach (var x in game.white)
{
board[x].BackgroundImage = Properties.Resources.white;
}
for (int i = 0; i < 64; ++i)
{
board[i].Refresh();
}
computer_score.Text = "2";
your_score.Text = "2";
turn.Text = "";
}
private void computer_move()
{
frontier = game.get_frontier(false);
if (frontier == null)
{
if (game.game_over())
{
gameover();
return;
}
MessageBox.Show("computer has no moves"); // computer has no moves
return;
}
possible_move m = game.ai_make_move((int)ab_depth.Value);
board[m.pos].BackgroundImage = Properties.Resources.hint;
board[m.pos].Refresh();
System.Threading.Thread.Sleep(100);
game = game.make_move(m);
display_state();
computer_score.Text = game.black.Count.ToString();
your_score.Text = game.white.Count.ToString();
}