Practice (game of 'Pig')

import java.util.Scanner;
public class chapterThreeProblemTen
{
    /*This program simulates a game of 'Pig', in which two players role a
     *2d6 die taking turns till they reach 100 points. On a players turn
     *they role the die until they get a '1', or choose to 'hold'. If they
     *get a '1', their turn is over and they don't get any points. If they
     *choose to 'hold', that player keeps all the points they have earned
     *up to that point and add them to their score. (Since one of the
     *players here is a computer, they limit themselves to <= 20 points in
     *a turn)*/
    public static void main(String[] args)
    {
        Scanner keyboard = new Scanner(System.in);

        //obvious variables
        int humanScore = 0;
        int computerScore = 0;
        int diceRoll = 0;

        boolean playerTurn = true; //If the number is true, it is the players turn.

        int turnTotal = 0; //This variable is the amount of points one has
                            //rolled in their turn. This is temporary,
                            //because rolling a '1' will make this '0'

        String playerInput = "r"; //This variable controls the if statement that
                                //controls whether players continue to roll
                                //or hold with whatever point they may have
                                //'r' is roll; 'h' is hold;

        System.out.println("Score to win is 100.");

        if ((humanScore < 100) || (computerScore < 100))
        {
            do
            {
                System.out.println("Your score is: " + humanScore);
                System.out.println("Computers score is: "+ computerScore);
                System.out.println("Points this turn: " + turnTotal);
                System.out.println("type 'r' to roll or 'h' to hold.");
                playerInput = keyboard.nextLine();

                if (playerInput.equalsIgnoreCase("r"))
                {
                    diceRoll = ( int )(Math.random() * 6) + 1;
                    System.out.println("You rolled a " + diceRoll);

                    if (diceRoll != 1)
                    {
                        turnTotal = (turnTotal + diceRoll);
                    }
                    else // terminal condition dice =1, break from turn
                    {
                        turnTotal = 0;
                        playerTurn = false;
                    }
                }
                else
                {
                    humanScore = (humanScore + turnTotal);
                    turnTotal = 0;
                    playerTurn = false;
                }
            }
            while (playerTurn = true);

            do
            {
                if (turnTotal < 20)
                {
                    diceRoll = ( int )(Math.random() * 6) + 1;

                    if (diceRoll != 1)
                    {
                        turnTotal = (turnTotal + diceRoll);
                    }
                    else // terminal condition dice =1, break from turn
                    {
                        turnTotal = 0;
                        playerTurn = true;
                    }
                }
                else
                {
                    computerScore = (computerScore + turnTotal);
                    turnTotal = 0;
                    playerTurn = true;
                }
            }
            while (playerTurn != true);
        }
    }
}