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diff --git a/Tobii EyeX/samples/ActivatableBoardGame/Board.cpp b/Tobii EyeX/samples/ActivatableBoardGame/Board.cpp
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+++ b/Tobii EyeX/samples/ActivatableBoardGame/Board.cpp
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+/*
+ * ActivatableBoardGame sample:
+ * This is an example that demonstrates the use of Activatable interactors in the context of a board game.
+ *
+ * Copyright 2013 Tobii Technology AB. All rights reserved.
+ */
+
+#include "stdafx.h"
+#include "Board.h"
+#include <cassert>
+#include <vector>
+#include "Observer.h"
+
+// initialize the random number generator.
+auto const seed = std::random_device()();
+std::mt19937 Board::_randomNumberGenerator(seed);
+
+Board::Board(int size)
+	: _size(size), _board(nullptr), _boardChangedObserver(nullptr)
+{
+	_board = new Marker[_size * _size];
+	BeginNewGame();
+}
+
+Board::~Board()
+{
+	delete[] _board;
+}
+
+void Board::InitBoard()
+{
+	for (int i = 0; i < _size; ++i)
+	{
+		for (int j = 0; j < _size; ++j)
+		{
+			SetMarkerAt(Position(i, j), Marker::None);
+		}
+	}
+
+	SetMarkerAt(Position((_size - 1) / 2, (_size - 1) / 2), Marker::X);
+	SetMarkerAt(Position((_size - 1) / 2, (_size - 1) / 2 + 1), Marker::O);
+	SetMarkerAt(Position((_size - 1) / 2 + 1, (_size - 1) / 2), Marker::O);
+	SetMarkerAt(Position((_size - 1) / 2 + 1, (_size - 1) / 2 + 1), Marker::X);
+}
+
+Board::Marker Board::GetMarkerAt(Position position) const
+{
+	assert(IsValidPosition(position));
+
+    return _board[position.column + position.row * _size];
+}
+
+void Board::SetMarkerAt(Position position, Marker marker)
+{
+	assert(IsValidPosition(position));
+
+	_board[position.column + position.row * _size] = marker;
+
+	NotifyObserver();
+}
+
+void Board::MakeHumanPlayerMove(Position position)
+{
+	if (_playerInTurn == Marker::X && 
+		!IsGameOver() && 
+		GetMarkerAt(position) == Marker::None)
+	{
+		MakeMove(position);
+
+		if (!IsGameOver())
+		{
+			MakeAIPlayerMove();
+		}
+	}
+}
+
+bool Board::CanMakeMoveAt(Position position) const
+{
+	return IsValidPosition(position) &&
+		GetMarkerAt(position) == Marker::None;
+}
+
+void Board::BeginNewGame()
+{
+	InitBoard();
+	_playerInTurn = Marker::X; 
+	_winner = Marker::None;
+}
+
+bool Board::IsValidPosition(Position position) const
+{
+	return 0 <= position.row && position.row < _size &&
+		0 <= position.column && position.column < _size;
+}
+
+void Board::MakeAIPlayerMove()
+{
+	// generate the list of all possible moves. not that they are good or anything, just possible.
+	std::vector<Position> possibleMoves;
+	for (int i = 0; i < _size; i++)
+	{
+		for (int j = 0; j < _size; j++)
+		{
+			Position position(i, j);
+			if (GetMarkerAt(position) == Marker::None)
+			{
+				possibleMoves.push_back(position);
+			}
+		}
+	}
+
+	// since we check whether the game is a draw before calling this method, there should always be at least one possible move.
+	assert(possibleMoves.size() > 0);
+
+	// pick a move at random.
+	std::uniform_int_distribution<int> idist(0, (int)possibleMoves.size() - 1); 
+	int randomMoveIndex = idist(_randomNumberGenerator);
+	MakeMove(possibleMoves[randomMoveIndex]);
+}
+
+void Board::MakeMove(Position position)
+{
+	SetMarkerAt(position, _playerInTurn);
+	_playerInTurn = (_playerInTurn == Marker::O) ? Marker::X : Marker::O;
+
+	DetectWinner(position);
+	DetectDrawGame();
+}
+
+void Board::DetectWinner(Position position)
+{
+	auto marker = GetMarkerAt(position);
+
+	for (int i = 0; i < OrientationMaxValue; ++i)
+	{
+		Orientation orientation = (Orientation)i;
+		int sequenceLength(1);
+
+		bool directions[] = { true, false };
+
+		for each (auto forward in directions)
+		{
+			auto neighbor = GetAdjacentPosition(position, orientation, forward);
+			while (IsValidPosition(neighbor) && GetMarkerAt(neighbor) == marker)
+			{
+				sequenceLength++;
+				neighbor = GetAdjacentPosition(neighbor, orientation, forward);
+			}
+		}
+
+		if (sequenceLength >= WinningSequenceLength)
+		{
+			_winner = marker;
+			_playerInTurn = Marker::None;
+			NotifyObserver();
+		}
+	}
+}
+
+void Board::DetectDrawGame()
+{
+	// if there is an empty position, the game isn't a draw (yet).
+	for (int i = 0; i < _size; ++i)
+	{
+		for (int j = 0; j < _size; ++j)
+		{
+			if (GetMarkerAt(Position(i, j)) == Marker::None)
+			{
+				return;
+			}
+		}
+	}
+
+	// no empty positions found: it's a draw.
+	_playerInTurn = Marker::None;
+	NotifyObserver();
+}
+
+Board::Position Board::GetAdjacentPosition(Position position, Orientation orientation, bool forward) const
+{
+	Position delta(-1, -1);
+	switch (orientation)
+	{
+	case Orientation::North:
+		delta = Position(+1, 0);
+		break;
+	case Orientation::East:
+		delta = Position(0, +1);
+		break;
+	case Orientation::Northeast:
+		delta = Position(+1, +1);
+		break;
+	case Orientation::Southeast:
+		delta = Position(-1, +1);
+		break;
+	default:
+		assert(false);
+	}
+
+	if (!forward)
+	{
+		delta.row = -delta.row;
+		delta.column = -delta.column;
+	}
+
+	return Position(position.row + delta.row, position.column + delta.column);
+}
+
+void Board::RegisterBoardChangedObserver(Observer* boardChangedObserver)
+{
+	_boardChangedObserver = boardChangedObserver;
+}
+
+void Board::NotifyObserver()
+{
+	if (_boardChangedObserver)
+	{
+		_boardChangedObserver->SubjectChanged();
+	}
+}