# Tic Tac Toe notes

## Checkpoint 1 Notes

Which class is responsible for each of the following behaviors?
For each, explain how the behavior is accomplished.

### Checking to see whether the game is over

Responsible class: `TTTGame`, method `is_over`.

Explanation: `TTTGame.is_over` determines whether play should stop. It returns True when the board is full or when either player has three in a row using `check_winner`. The game logic and win/draw detection are implemented on the `TTTGame` class.
### Determining which actions are available at a particular state

Responsible class: `TTTGame`, method `get_actions`.

Explanation: `TTTGame.get_actions` inspects `state["board"]` and returns a list of indices for empty spaces (those containing `'-'`). The game class encapsulates available-move generation for the current board state.
### Showing the board

Responsible class: `TTTView`, primarily `print_board`, `format_row`, and `format_value`.

Explanation: `TTTView` handles all screen display. `print_board(state)` arranges rows and separators, `format_row` formats a single row, and `format_value` prints an `X`, `O`, or the index for an empty spot. The view is responsible for how the board is presented.
### Choosing which action to play on a turn

Responsible classes: `TTTHumanPlayer` and `TTTComputerPlayer`.

Explanation: Players decide moves. `TTTHumanPlayer.choose_action(state)` prompts the user and returns the selected index. `TTTComputerPlayer.choose_action(state)` to use a strategy (here `RandomStrategy`) and returns the chosen move. So the player classes and any strategy objects they use are responsible for selecting the action to play on a turn.

## Checkpoint 2 Notes

### TTT Strategy

For each of the following board states, if you are playing as X
and it's your turn, which action would you take? Why?

   | O | O       |   | O       | X |       X | O |   
---+---+---   ---+---+---   ---+---+---   ---+---+---
 X | X |         | X |       X | O | O       |   |   
---+---+---   ---+---+---   ---+---+---   ---+---+---
   |   |         |   | O       |   |         |   |   

### Initial game state

You can get the inital game state using game.get_initial_state(). 
What is the current and future reward for this state? What does this mean?