diff --git a/index.html b/index.html
index 737a725..a20a4d0 100644
--- a/index.html
+++ b/index.html
@@ -16,6 +16,13 @@
     <div>
         <button class="resetButton" id="reset">Сначала</button>
     </div>
+    <div>
+        <label for="ai-selection">Выберите ИИ:</label>
+        <select id="ai-selection">
+            <option value="random">Случайный ИИ</option>
+            <option value="smart">Умный ИИ</option>
+        </select>
+    </div>
     <script src="index.js"></script>
 </body>
 </html>
\ No newline at end of file
diff --git a/index.js b/index.js
index 7553909..dc0c3af 100644
--- a/index.js
+++ b/index.js
@@ -1,12 +1,17 @@
 const CROSS = 'X';
 const ZERO = 'O';
 const EMPTY = ' ';
+let currentTurn = CROSS;
 
 const container = document.getElementById('fieldWrapper');
 
 startGame();
 addResetListener();
 
+field = Array.from({ length: 3 }, () => Array.from({ length: 3 }, () => EMPTY));
+dimension = 3;
+
+
 function startGame () {
     renderGrid(3);
 }
@@ -26,14 +31,228 @@ function renderGrid (dimension) {
     }
 }
 
-function cellClickHandler (row, col) {
-    // Пиши код тут
+function checkFilledAmount() {
+    let count = 0;
+    for (let i = 0; i < dimension; i++) {
+        for (let j = 0; j < dimension; j++) {
+            if (field[i][j] !== EMPTY) {
+                count++;
+            }
+        }
+    }
+    return count > dimension * dimension / 2;
+}
+
+function expandField() {
+    oldField = field.map(row => [...row]);
+    console.log(`Expanding field to ${dimension+1}`);
+    renderGrid(dimension + 1);
+    field = Array.from({ length: dimension + 1 }, () => Array.from({ length: dimension + 1 }, () => EMPTY));
+    for (let i = 0; i < dimension; i++) {
+        for (let j = 0; j < dimension; j++) {
+            field[i][j] = oldField[i][j];
+            renderSymbolInCell(field[i][j], i, j);
+        }
+    }
+    dimension++;
+} 
+
+function getBestMove() {
+    let bestScore = -Infinity;
+    let move;
+    for (let i = 0; i < dimension; i++) {
+        for (let j = 0; j < dimension; j++) {
+            if (field[i][j] === EMPTY) {
+                field[i][j] = ZERO;
+                const score = minimax(field, 0, false);
+                field[i][j] = EMPTY;
+                if (score > bestScore) {
+                    bestScore = score;
+                    move = [i, j];
+                }
+            }
+        }
+    }
+    console.log(`Best move: ${move}`);
+    return move;
+}
+
+function minimax(field, depth, isMaximizing) {
+    if (depth > 7) {
+        return 0;
+    }
+    const result = checkWin();
+    if (result.isWin) {
+        return isMaximizing ? -10 : 1;
+    }
+    if (checkDraw()) {
+        return 0;
+    }
+
+    if (isMaximizing) {
+        let bestScore = -Infinity;
+        currentTurn = ZERO;
+        for (let i = 0; i < dimension; i++) {
+            for (let j = 0; j < dimension; j++) {
+                if (field[i][j] === EMPTY) {
+                    field[i][j] = ZERO;
+                    const score = minimax(field, depth + 1, false);
+                    field[i][j] = EMPTY;
+                    bestScore = Math.max(score, bestScore);
+                }
+            }
+        }
+        return bestScore;
+    } else {
+        let bestScore = Infinity;
+        currentTurn = CROSS;
+        for (let i = 0; i < dimension; i++) {
+            for (let j = 0; j < dimension; j++) {
+                if (field[i][j] === EMPTY) {
+                    field[i][j] = CROSS;
+                    const score = minimax(field, depth + 1, true);
+                    field[i][j] = EMPTY;
+                    bestScore = Math.min(score, bestScore);
+                }
+            }
+        }
+        return bestScore;
+    }
+}
+
+
+function getRandomCell() {
+    let row, col;
+    do {
+        row = Math.floor(Math.random() * dimension);
+        col = Math.floor(Math.random() * dimension);
+    } while (field[row][col] !== EMPTY);
+    return [row, col];
+}
+
+function makeMoveByAI(aiType) {
+    const move = aiType === 'random' ? getRandomCell() : getBestMove();
+    const [row, col] = move;
+    currentTurn = ZERO;
+    field[row][col] = currentTurn;
+    renderSymbolInCell(currentTurn, row, col);
+    
+    const winInfo = checkWin();
+    if (winInfo.isWin) {
+        highlightWinningCells(winInfo.winningCells);
+        setTimeout(() => alert(`${currentTurn} wins!`), 0); // setTimeout для того, чтобы сначала подсветились клетки, а потом выскочило окно
+        endGame();
+        return;
+    };
+    
+    if (checkDraw()) {
+        setTimeout(() => alert("Победила дружба"), 0);
+        endGame()
+        return;
+    }
+    if (aiType === 'random' && checkFilledAmount()) {
+        expandField();
+    }
+    currentTurn = CROSS;
+}
+
+function cellClickHandler(row, col) {
+    if (field[row][col] !== EMPTY) return;
+
+    field[row][col] = currentTurn;
+    renderSymbolInCell(currentTurn, row, col);
+
+    const winInfo = checkWin();
+    if (winInfo.isWin) {
+        highlightWinningCells(winInfo.winningCells);
+        setTimeout(() => alert(`${currentTurn} wins!`), 0);
+        endGame();
+        return;
+    };
+
+    if (checkDraw()) {
+        setTimeout(() => alert("Победила дружба"), 0);
+        endGame()
+        return;
+    }
+    const aiType = document.getElementById('ai-selection').value;
+    if (aiType === 'random' && checkFilledAmount()) {
+        expandField();
+    }
+    makeMoveByAI(aiType);
     console.log(`Clicked on cell: ${row}, ${col}`);
+}
+
+function highlightWinningCells(winningCells) {
+    winningCells.forEach(cell => {
+        const [row, col] = cell;
+        renderSymbolInCell(field[row][col], row, col, 'red');
+    });
+}
+
+
+function checkWin() {
+    for (let i = 0; i < dimension; i++) {
+        let rowWin = true;
+        let colWin = true;
+        let winningCellsRow = [];
+        let winningCellsCol = [];
+        for (let j = 0; j < dimension; j++) {
+            if (field[i][j] !== currentTurn) {
+                rowWin = false;
+            }
+            if (field[j][i] !== currentTurn) {
+                colWin = false;
+            }
+            // Запоминаем победные клетки
+            if (rowWin) {
+                winningCellsRow.push([i, j]);
+            }
+            if (colWin) {
+                winningCellsCol.push([j, i]);
+            }
+        }
+        if (rowWin) {
+            return { isWin: true, winningCells: winningCellsRow };
+        }
+        if (colWin) {
+            return { isWin: true, winningCells: winningCellsCol };
+        }
+    }
+
+    // Проверка диагоналей
+    let diagonalWin1 = true;
+    let diagonalWin2 = true;
+    let winningCellsDiag1 = [];
+    let winningCellsDiag2 = [];
+    for (let i = 0; i < dimension; i++) {
+        if (field[i][i] !== currentTurn) {
+            diagonalWin1 = false;
+        }
+        if (field[i][dimension - i - 1] !== currentTurn) {
+            diagonalWin2 = false;
+        }
+        // Запоминаем победные клетки
+        if (diagonalWin1) {
+            winningCellsDiag1.push([i, i]);
+        }
+        if (diagonalWin2) {
+            winningCellsDiag2.push([i, dimension - i - 1]);
+        }
+    }
+    if (diagonalWin1) {
+        return { isWin: true, winningCells: winningCellsDiag1 };
+    }
+    if (diagonalWin2) {
+        return { isWin: true, winningCells: winningCellsDiag2 };
+    }
+
+    return { isWin: false };
+}
 
 
-    /* Пользоваться методом для размещения символа в клетке так:
-        renderSymbolInCell(ZERO, row, col);
-     */
+function checkDraw() {
+    return field.flat().indexOf(EMPTY) === -1;
 }
 
 function renderSymbolInCell (symbol, row, col, color = '#333') {
@@ -54,36 +273,15 @@ function addResetListener () {
 }
 
 function resetClickHandler () {
-    console.log('reset!');
-}
-
-
-/* Test Function */
-/* Победа первого игрока */
-function testWin () {
-    clickOnCell(0, 2);
-    clickOnCell(0, 0);
-    clickOnCell(2, 0);
-    clickOnCell(1, 1);
-    clickOnCell(2, 2);
-    clickOnCell(1, 2);
-    clickOnCell(2, 1);
-}
-
-/* Ничья */
-function testDraw () {
-    clickOnCell(2, 0);
-    clickOnCell(1, 0);
-    clickOnCell(1, 1);
-    clickOnCell(0, 0);
-    clickOnCell(1, 2);
-    clickOnCell(1, 2);
-    clickOnCell(0, 2);
-    clickOnCell(0, 1);
-    clickOnCell(2, 1);
-    clickOnCell(2, 2);
-}
-
-function clickOnCell (row, col) {
-    findCell(row, col).click();
+    dimension = prompt("Введите размер поля", 3);
+    field = Array.from({ length: dimension }, () => Array.from({ length: dimension }, () => EMPTY));
+    renderGrid(dimension);
+    currentTurn = CROSS;
+}
+
+function endGame() {
+    container.querySelectorAll('td').forEach(cell => {
+        const clonedCell = cell.cloneNode(true); // Создание клонов для сохранения текущих данных и отвязки eventListener
+        cell.parentNode.replaceChild(clonedCell, cell);
+    });
 }