help the othello

import java.awt.Point;

abstract public class AbstractPlayer {
  /**
   * NOT_AVAILABLE indicate that it's impossible to put any chess on the
   * specified position on the chessboard.
   */
  public static final byte NOT_AVAILABLE = 3;

  /**
   * AVAILABLE indicate that the specified position on the chessboard is empty
   * at this time, and is possible to accept white or black chess in the future.
   */
  public static final byte AVAILABLE = 0;

  /**
   * BLACK indicate that the specified position on the chessboard is a black
   * chess.
   */
  public static final byte BLACK = 1;

  /**
   * WHITE indicate that the specified position on the chessboard is a white
   * chess.
   */
  public static final byte WHITE = 2;

  /**
   * This function will be called at the beginning of the game. No matter which
   * side you are.
   * 
   * @param chessContext
   *          A reference object which might be useful during the game
   * @param chessboard
   *          A byte array which contains the current chessboard,
   *          chessboard[x][y] means row y, column x;
   * @param timeLimit
   *          The maximum allow time (in milliseconds) for each step, zero if no
   *          limit
   * @param memoryLimit
   *          The maximum memory limit (in bytes) for each step, zero if no
   *          limit
   * @param color
   *          true for black side, false for white side
   * @return Undefined
   */
  abstract public int init(ChessContext chessContext, byte[][] chessboard,
      int timeLimit, int memoryLimit, boolean color);

  /**
   * This function will be whenever it's current player's turn, no matter there
   * is any available positions for current player or not.
   * 
   * @param chessboard
   *          Current chessboard, chessboard[x][y] means row y column x
   * @param availables
   *          Available positions for this turn, if there is no available
   *          position for current player, it will be an empty array (not a null
   *          pointer).
   * @param curStep
   *          the step number from the beginning
   * @param lastMove
   *          The position which the opponent choose in the last turn, null if
   *          there is no available postion in the last turn for the opponent,
   * @return If availables.length>0, the returned value must be an integer from
   *         0 to availables.length-1 (inclusive). If availables.length==0, the
   *         return value can be anything.
   */
  abstract public int myTurn(byte[][] chessboard, Point[] availables,
      int curStep, Point lastMove);
}

import java.awt.Point;

public interface ChessContext {
  /**
   * @return total steps from beginning
   */
  public int getTotalSteps();

  /**
   * @param step
   *          from 0 to getTotalSteps()-1 (inclusive)
   * @return The selected position in the specified step.
   */
  public Point getStep(int step);

  /**
   * @return available positions for current step
   */
  public Point[] getAvailablePositionsForCurrentStep();

  /**
   * @return total time limit (0 means unlimited)
   */
  public int getTotalTimeLimit();

  /**
   * @return time limit for each step (0 means unlimited)
   */
  public int getStepTimeLimit();

  /**
   * @return memory limit for each step (0 means unlimited)
   */
  public int getMemoryLimit();

  /**
   * @return total left time
   */
  public int getTotalLeftTime();

  /**
   * @return left time for current step
   */
  public int getLeftTime();

  /**
   * @return memory left for current step
   */
  public int getLeftMemory();

  /**
   * @return current chessboard
   */
  public byte[][] getChessboard();

  /**
   * @return width of the chessboard
   */
  public int getChessboardWidth();

  /**
   * @return height of the chessboard
   */
  public int getChessboardHeight();

  /**
   * @return true if color is black, false if color is white
   */
  public boolean getMyColor();
}