if not playagain()break lines and are located immediately after the while-block started by the while statement on line gameisplaying is set to false when the game has endedso at this point the game asks the player if they want to play again if playagain(returns falsethen the if statement' condition is true (because the not operator reverses the boolean valueand the break statement executes that breaks the execution out of the while loop that was started on line but since there are no more lines of code after that while-blockthe program terminates summary creating program that can play game comes down to carefully considering all the possible situations the ai can be in and how it should respond in each of those situations the tic tac toe ai is simple because there are not many possible moves in tic tac toe compared to game like chess or checkers our ai checks if any possible move can allow itself to win otherwiseit checks if it must block the player' move then the ai simply chooses any available corner spacethen the center spacethen the side spaces this is simple algorithm for the computer to follow the key to implementing our ai is by making copies of the board data and simulating moves on the copy that waythe ai code can see if move results in win or loss then the ai can make that move on the real board this type of simulation is effective at predicting what is good move or not post questions to