![]() ![]() Hi Olivia! There is no specific age that you have to be to play tic tac toe, but here are some tips for learning how to count. I’ve heard that it’s too young, and also old enough to start learning how to count! Tl dr By doing depth-first minimax recursion, you won't make any new functions except your single recursive function.There is no specific age that you have to be to play tic tac toe You can see by this logic that you never have more boards in memory or any external storage other than the single chain of moves being considered right now (and, at each level, you'll be iterating through the list of possible moves to make from it - so there's also that memory of how far through you are, etc). And so on until you reach the maximum depth or a terminal move, THEN you return. Which starts by calling itself with the first move it can make. This means that your recursive minimax-implementing function starts by calling itself with the first move it can make. It is a conceptual tree, the result of testing every move depth first, taking note of the scores at each leaf (alpha, beta, etc) and propagating them up. The trees that are visualized when describing the minimax (/alpha-beta pruning) algorithm is NOT a 'real tree' in the sense that you construct the entire tree in memory. ![]() # successors(S) is a list whose members are all of the successors of S. ![]() # If S is a state, allSafeSuccessors(S) means that every # flag means we have found a safe successor # If S is a state, someSafeSuccessor(S) means that S has If turn(S)='x': return allSafeSuccessors(S) If turn(S)='o': return someSafeSuccessor(S) # A state S is *safe* if player 'o' can force a win or tie from S. If it is x's move in S, then S is safe iff all successors of S are safe. If it is o's move in S, then S is safe iff at least one successor of S is safe.ģ. If S is over, then S is safe if 'x' does not have 3 in a row in S.Ģ. Next state after S1 in a legal game of tic tac toe.ġ. State S2 is a *successor* of state S1 if S2 can be the the Much googling later, I can't find anything that relates. I'm supposed to be using recursion in some form or fasion and these function names and contracts were pre-written, I filled in the actual definition. I can't figure out how to tie these functions together for a hard AI, in which it can never lose. ![]()
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