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## About JamesThiago

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1. yes, there's a alpha-beta search...If you have time i can show all the files for a better understanding....
2. double test(Game_state *current_state, int player, int x, int y){ int rightmostHeight = 0; int width = current_state->width; int height = current_state->height; /* Loop until we reach the top of the board or an empty square */ while (rightmostHeight < height && (current_state->board[width - 4][rightmostHeight] != C4_NONE)) { rightmostHeight ++; } if((current_state->board[width - 4][rightmostHeight] == C4_NONE)){ while (rightmostHeight < height && (current_state->board[width - 5][rightmostHeight] != C4_NONE)) { rightmostHeight++; } }else if((current_state->board[width - 5][rightmostHeight] == C4_NONE)){ while (rightmostHeight < height && (current_state->board[width - 3][rightmostHeight] != C4_NONE)) { rightmostHeight++; } }else{ rightmostHeight += ((double) rand() / (RAND_MAX / 2) - 1); } return rightmostHeight; } double agent_s3450124(Game_state *current_state, int player, int x, int y){ double score = 0; int is_game_won = game_won(current_state); if (is_game_won == player) score = 1; else if (is_game_won == other(player)) score = -1; else{ score += 0.1 *test(current_state, player, x, y); } return score; } This is my evaluation function(agent_s345012()) at the moment...
3. I have a lot of files...It's a bit hard to explain how all of them work...my work is just create a better agent than those....the other agents are working, but my cannot beat of of them....i need to create a stronger, that's my job...   that's the game, we choose the "players" and mine one is s3450124....so it's the function that needs to return a value between -1 and 1....so, I've posted my current code for my agent, sometimes it doesn't block the simple agent....for example, when i drop a piece in the center, and my opponent drop just above me and i drop in the left or right of my first drop....some strategies like that, I could put to work.  If you wanna see all the files, i can show you to a better understanding... thanks!
4. I did function using alpha beta and my only problem now is my evaluation function....there are 3 agents(evaluation functions that return a double between -1 and 1): double agent_random(Game_state *current_state, int player, int x, int y) { return (double) rand() / (RAND_MAX / 2) - 1; } double agent_simple(Game_state *current_state, int player, int x, int y) { double score = 0; int is_game_won = game_won(current_state); if (is_game_won == player) score = 1; else if (is_game_won == other(player)) score = -1; else { score += 0.5 * agent_random(current_state, player, x, y); /* score += 0.3 * super_cool_heuristic_a(current_state, player, x, y) */ /* score += 0.8 * super_cool_heuristic_b(current_state, player, x, y) */ } return score; } but my main agent is not defeating neither of them...i put to play random against mine and is so so, i put simple against my main and is not good....I know some strategies to win but i cannot put in the code....i just did this: double agent_s3450124(Game_state *current_state, int player, int x, int y){ double score = 0; int is_game_won = game_won(current_state); if (is_game_won == player) score = 1; else if (is_game_won == other(player)) score = -1; else if(y==2)||(y==3)||(y==4) { score = 0.7; } else { score += 0.8 * ((double) rand() / (RAND_MAX / 2) - 1); } return score; }
5. I was trying to develop this and I got: double evaluate(int player, int level, double alpha, double beta) { int i; double goodness, best, maxab; if (poll_function && next_poll <= clock()) { next_poll += poll_interval; (*poll_function)(); } if (level == depth) return goodness_of(player); else { /* Assume it is the other player's turn. */ best = -(INT_MAX); maxab = alpha; for(i=0; i<size_x; i++) { if (current_state->board[drop_order[i]][size_y-1] != C4_NONE) continue; /* The column is full. */ push_state(); drop_piece(other(player), drop_order[i]); if (current_state->winner == other(player)) goodness = -(goodness_of(player)) + (level - depth) * 0.01; else goodness = evaluate(other(player), level, -beta, -maxab); if (goodness > best) { best = goodness; if (best > maxab) maxab = best; } pop_state(); } /* What's good for the other player is bad for this one. */ return -best; } } is something like that?
6. I know some tactics of that game, I played a lot, but I don't know how to implement that function to return a value between -1 and 1. Before I played i tried this: #include <stdlib.h> #include "c4.h" double agent_s3450124(Game_state *current_state, int player, int x, int y); double agent_s3450124(Game_state *current_state, int player, int x, int y){ double score = 0; int rightmostHeight = 0; int width = current_state->width; int height = current_state->height; int is_game_won = game_won(current_state); if (is_game_won == player) score = 1; else if (is_game_won == other(player)){ score = -1; }else{ while ((rightmostHeight < height) &&(( current_state->board[width - 1][rightmostHeight]) != C4_NONE)) { rightmostHeight++; } score = 0.2*rightmostHeight; } return score; }
7. Alvaro, what do u mean about odd/even threat? the columns?
8. I'm reading Alvaro and now i know the basic fundamentals of this game. But I have no idea about what I need to do, to return a good value in this function. like, if the current position is a good position(for example, there are 3 pieces and you just need to put one more to finish) and the function will return 1. if there is a little bit worse position, you return, for example, 0.9....but I don't know how to calculate this...
9. I just did the simple code above. I just know the this function will need some maths to return a good value because this function evaluates the current board state and returns a double value between -1 (worst) and 1 (best) indicating how good it is.
10. I don't know how to play properly. I need a first step.
11. Hi guys, I spent a some days researching a lot about that, but I didn't find anything that really helped me. So, I came to u guys to help me....I have no idea how to start. I just have a really simple evaluation function, i'm doing in C. double agent_random(Game_state *current_state, int player, int x, int y) { return (double) rand() / (RAND_MAX / 2) - 1; } double agent_simple(Game_state *current_state, int player, int x, int y) { double score = 0; int is_game_won = game_won(current_state); if (is_game_won == player) score = 1; else if (is_game_won == other(player)) score = -1; else { score += 0.5 * agent_random(current_state, player, x, y); } return score; } I need ideas to start it...please, help me guys!
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