<p>Given a Tic-Tac-Toe board as a string array <code>board</code>, return <code>true</code> if and only if it is possible to reach this board position during the course of a valid tic-tac-toe game.</p>

<p>The board is a <code>3 x 3</code> array that consists of characters <code>&#39; &#39;</code>, <code>&#39;X&#39;</code>, and <code>&#39;O&#39;</code>. The <code>&#39; &#39;</code> character represents an empty square.</p>

<p>Here are the rules of Tic-Tac-Toe:</p>

<ul>
	<li>Players take turns placing characters into empty squares <code>&#39; &#39;</code>.</li>
	<li>The first player always places <code>&#39;X&#39;</code> characters, while the second player always places <code>&#39;O&#39;</code> characters.</li>
	<li><code>&#39;X&#39;</code> and <code>&#39;O&#39;</code> characters are always placed into empty squares, never filled ones.</li>
	<li>The game ends when there are three of the same (non-empty) character filling any row, column, or diagonal.</li>
	<li>The game also ends if all squares are non-empty.</li>
	<li>No more moves can be played if the game is over.</li>
</ul>

<p>&nbsp;</p>
<p><strong class="example">Example 1:</strong></p>
<img alt="" src="https://assets.leetcode.com/uploads/2021/05/15/tictactoe1-grid.jpg" style="width: 253px; height: 253px;" />
<pre>
<strong>Input:</strong> board = [&quot;O  &quot;,&quot;   &quot;,&quot;   &quot;]
<strong>Output:</strong> false
<strong>Explanation:</strong> The first player always plays &quot;X&quot;.
</pre>

<p><strong class="example">Example 2:</strong></p>
<img alt="" src="https://assets.leetcode.com/uploads/2021/05/15/tictactoe2-grid.jpg" style="width: 253px; height: 253px;" />
<pre>
<strong>Input:</strong> board = [&quot;XOX&quot;,&quot; X &quot;,&quot;   &quot;]
<strong>Output:</strong> false
<strong>Explanation:</strong> Players take turns making moves.
</pre>

<p><strong class="example">Example 3:</strong></p>
<img alt="" src="https://assets.leetcode.com/uploads/2021/05/15/tictactoe4-grid.jpg" style="width: 253px; height: 253px;" />
<pre>
<strong>Input:</strong> board = [&quot;XOX&quot;,&quot;O O&quot;,&quot;XOX&quot;]
<strong>Output:</strong> true
</pre>

<p>&nbsp;</p>
<p><strong>Constraints:</strong></p>

<ul>
	<li><code>board.length == 3</code></li>
	<li><code>board[i].length == 3</code></li>
	<li><code>board[i][j]</code> is either <code>&#39;X&#39;</code>, <code>&#39;O&#39;</code>, or <code>&#39; &#39;</code>.</li>
</ul>

class Solution:
    def validTicTacToe(self, board):
        count_x=0
        count_o=0
        count_do=0
        count_dx=0
        count_ho=0
        count_hx=0
        count_vo=0
        count_vx=0
        for i in range(3):
            for j in range(3):
                if board[i][j]=='O':
                    count_o+=1
                if board[i][j]=='X':
                    count_x+=1
        for i in range(3):
            if board[i][0]==board[i][1]==board[i][2]=='O':
                count_ho+=1
            if board[i][0]==board[i][1]==board[i][2]=='X':
                count_hx+=1
        for i in range(3):
            if board[0][i]==board[1][i]==board[2][i]=='O':
                count_vo+=1
            if board[0][i]==board[1][i]==board[2][i]=='X':
                count_vx+=1
        if board[0][0]==board[1][1]==board[2][2]=='O':
            count_do+=1
        if board[0][0]==board[1][1]==board[2][2]=='X':
            count_dx+=1
        if board[0][2]==board[1][1]==board[2][0]=='O':
            count_do+=1
        if board[0][2]==board[1][1]==board[2][0]=='X':
            count_dx+=1

        if count_ho>=2 or count_vo>=2 or count_hx>=2 or count_vx>=2 or (count_ho>=1 and count_hx>=1) or (count_vo>=1 and count_vx>=1):
            return False
        if count_o>count_x or count_o+1<count_x:
            return False
        if (count_ho>=1 or count_vo>=1 or count_do>=1) and count_o<count_x:
            return False
        if (count_hx>=1 or count_vx>=1 or count_dx>=1) and count_o==count_x:
            return False

        return True

board = ["XOX"," X ","   "]
obj=Solution()
print(obj.validTicTacToe(board))        
18