done

Game.cs

@@ -58,26 +58,59 @@ namespace TicTacToe
             SetInputEnabled(false);
 
             Random random = new Random();
-            Box box;
-            bool[] boxCache = new bool[9];
 
-            while (true)
+            var empty = boxes.Where(b => !b.Filled).ToList();
+
+            // try to win
+            foreach (Box b in empty)
             {
-                int randomIndex = random.Next(0, 8);
-                box = boxes[randomIndex];
-                boxCache[randomIndex] = true;
-                if (!box.Filled)
+                b.BotOwned = true;
+                b.Filled = true;
+
+                if (CheckWins(true))
                 {
-                    break;
+                    b.PlayerClaim(true);
+                    RoundEnded();
+                    return;
                 }
+
+                b.BotOwned = false;
+                b.Filled = false;
             }
 
+            // try to block
+            foreach (Box b in empty)
+            {
+                b.BotOwned = false;
+                b.Filled = true;
+
+                if (CheckWins(false))
+                {
+                    b.PlayerClaim(true);
+                    RoundEnded();
+                    return;
+                }
+
+                b.Filled = false;
+            }
+
+            // pick middle
+            if (!boxes[4].Filled)
+            {
+                boxes[4].PlayerClaim(true);
+                RoundEnded();
+                return;
+            }
+
+            // else pick random
+            int index = random.Next(0, empty.Count);
+            Box box = empty[index];
             box.PlayerClaim(true);
 
             RoundEnded();
         }
 
-        public bool CheckWins()
+        public bool CheckWins(bool bot) // check if bot won, or player if bot == true
         {
             int[][] lines =
             {
@@ -96,9 +129,9 @@ namespace TicTacToe
                 if (!boxes[line[0]].Filled || !boxes[line[1]].Filled || !boxes[line[2]].Filled)
                     continue;
 
-                if (boxes[line[0]].BotOwned == BotRound &&
-                    boxes[line[1]].BotOwned == BotRound &&
-                    boxes[line[2]].BotOwned == BotRound)
+                if (boxes[line[0]].BotOwned == bot &&
+                    boxes[line[1]].BotOwned == bot &&
+                    boxes[line[2]].BotOwned == bot)
                 {
                     return true;
                 }
@@ -112,14 +145,9 @@ namespace TicTacToe
             SetInputEnabled(true);
         }
 
-        public void CheckWin()
-        {
-
-        }
-
         public void RoundEnded()
         {
-            if (CheckWins())
+            if (CheckWins(BotRound))
             {
                 if (BotRound)
                 {