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Sunday, April 20, 2008

Minimax Pseudocode

Sunday, April 20, 2008 Posted by Ismail Habib , 48 comments

Last year I wrote a post about AI in reversi using minimax algorithm with alpha beta pruning. However, it said nothing about the implementation. So, for you guys who already grabbed the idea of minimax but still having some troubles in implementing it, here's a pseudocode that might help you with. It's not something that I wrote by myself, but the idea is somewhat similar.

minimax(in game board, in best_opposing_score, out score chosen_score, out move chosen_move)
best_score = -infinity;
for (i = 0 to moves_list.num_moves-1) do
new_board = board;
Gt_move(board, moves_list[i],the_unmove);
minimax(board, the_score,the_move);
if (the_score > best_score) then
best_score = the_score;
best_move = moves_list[i];
if (best_score > best_opposing_score) then
cut;/* the opponent will not allow you to reach this node*/
chosen_move = best_move;

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  3. I was wondering this 'cause I didn't remember how Minimax Pseudocode are. Thanks for post this your blog it's very useful keep up the good work.

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