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              <div class="container">
  <!-- header -->
  <div class="header">
    <img src="http://pctechtips.org/pics/header-logo-tictactoe.png">
  </div>
  <div class="select">
    <p>You're playing against computer. Choose X or O</p>
  <form action="#" >
    <input class="checkBox" type="checkbox" name="xPlayer" value="X">X Player    
</form>
  <form action="#">
    <input class="checkBox" type="checkbox" name="oPlayer" value="O">O Player 
  </form>
  </div>
  <div class="tictactoe">  
     <!-- selection for X or O -->       
    <!-- first row (3 square) -->
    <div class="row">
      <div id="0" class="square right bottom"></div><!-- 
      --><div id="1" class="square right bottom"></div><!--
      --><div id="2" class="square bottom"></div>      
    </div>
    
    <!-- second row (3 square) -->
    <div class="row">
      <div id="3" class="square right bottom"></div><!--
      --><div id="4" class="square right bottom"></div><!--
      --><div id="5" class="square bottom"></div>      
    </div> 
    
    <!-- third row (3 square) -->
    <div class="row">
      <div id="6" class="square right"></div><!--
      --><div id="7" class="square right"></div><!--
      --><div id="8" class="square"></div>      
    </div>     
  </div> 
</div>
            
          
!
            
              body {
  background-color: #174c6d;
  font-family: verdana, sans-serif;
  color: white;
}

.container {
  margin: 0 auto;
  text-align: center;
}

.header {
  margin-top: 10px;
}

p {
  font-size: 20px;
  margin-bottom: 0px;
}

.select > form {
  display: inline-block;
  margin-top: 20px;
  margin-right:20px;
  margin-left:20px;
  font-size: 20px;
}

h2 {
  margin-bottom: 30px;
}

.tictactoe {
  margin-top: 70px;
  margin-bottom: 70px;
}

/* setting font-size of row to 0px
   to prevent indentation/margin row*/
/* .row {
  font-size: 0px;
} */
.row > div {
  margin: 0px;
  display: inline-block;
  font-size: 90px;
  width: 100px;
  height: 100px;
  text-align: center; 
  padding: 0px;
  vertical-align: top;
  line-height: 100px;
}

.right {
  border-right: solid 7px white;
}


.bottom {
  border-bottom: solid 7px white;
}

.resetGame {
  font-size: 20px;
  background-color: gray;
}

#message {
  /* display: inline-block; */
  text-align: center; 
}





            
          
!
            
              //variables
  var turn;
  var computer;
  var user;
  var sqrId;
  var board = [
    ["","",""], 
    ["","",""], 
    ["","",""]
  ];
  var row, col;

$(document).ready(function() { 
  
  //listener for checkboxes X and O
  $(".checkBox").click(function() {
    console.log("checked");
    if($(this).is(":checked")) {
      user = $(this).val();
      turn = user;
      computer = (user == 'X') ? 'O' : 'X';
      console.log(turn + " " + user + " " + computer);
    }
  });
  
  //listener for event clicks
  $(".square").click(function() {
    sqrId = $(this).attr("id");    
    playerMove(sqrId)
    computerPlayLevel1();    
    if(checkWinners()) {
      alert(turn+" Wins the Game!");
      resetGame();
    }
    //checking board: if empty sqr play, else its a draw
    if(!checkBoard()) {
      alert("is a draw!");
    } 
    turn = (turn == user) ? computer : user;
  });  
});

//reset game function
function resetGame() {
  $(".square").text("");
  turn = undefined;
  computer = undefined;
  user = undefined;
  //unchecking dialog boxes
  $(".checkBox").prop("checked", false);
  board = [["","",""], ["","",""], ["","",""]];
}

//getting user move and output to board
function playerMove(sqrId) {
  console.log("player move: "+$('#'+sqrId).attr("id")+" "+turn);
  //if sqr is empty then run logic, else error: wrong play!
  if($('#'+sqrId).text() == "") {
      $('#'+sqrId).text(user);
      row = getRow();
      col = getCol();
      console.log(sqrId+" "+row+","+col);
      board[row][col] = user;
      console.log(board);
    }
    else {
      alert("wrong move. Try again!");
      return;
    }    
}

/* AI logic level 1  generating random play */
function computerPlayLevel1() {
  var random;
  var min = 0, max = 8;
  do{
    random = Math.floor(Math.random() * (max + min));
  }while($("#"+random).text() != "")
  sqrId = random;
  row = getRow();
  col = getCol();
  board[row][col] = computer;
  $('#'+sqrId).text(computer);
}

//setting player to be X or O (check box)
function setPlayer() {
  
}

/* return row: divide sqrId by 3 as board[3][3] */
function getRow() {
  return Math.floor(sqrId / board.length);  
}

/* return column: module sqrId by 3 as board[3][3] */
function getCol() {
  return sqrId % board.length;
}

//checking for winning combinations
function checkWinners() {
  console.log(board[1]);  
  //checking rows
  for(var i = 0; i < board.length; i++) {
    if(board[i][0] != "" && board[i][0] == board[i][1] && board[i][1] == board[i][2]) {
      console.log("rows: "+board[i][0]+""+board[i][1]+""+board[i][2]);
      return true;
    }      
  }
  //checking columns
  for(var j = 0; j < board.length; j++) {
    if(board[0][j] != "" && board[0][j] == board[1][j] && board[1][j] == board[2][j]) {
      console.log("column: "+board[0][j]+""+board[1][j]+""+board[2][j]);
      return true;
    }
  }
  //checking across
  if(board[0][0] != "" && board[0][0] == board[1][1] && board[1][1] == board[2][2]) {
    console.log("across1");
      return true;
  }
  if(board[0][2] != "" && board[0][2] == board[1][1] && board[1][1] == board[2][0]) {
    console.log("across2");
      return true;
  }
  //if reached here, no winners
  return false;
}

/* checking if there's more room to play, if not 
   then it's a draw'*/
function checkBoard() {
  for(var i = 0; i < board.length; i++) {
    for(var j = 0; j < board[i].length; j++)
    if(board[i][j] == "") { 
      return true;
    }
  }  
  return false;
}
            
          
!
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