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front-end/back-end: Tweaks to game AI

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This commit is contained in:
Stephen Seo 2022-04-27 15:02:53 +09:00
parent dcc9400483
commit 3172af19f8
1 changed files with 32 additions and 9 deletions
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41
front_end/src/ai.rs
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@ -13,6 +13,8 @@ use crate::game_logic::check_win_draw;
use crate::random_helper::get_seeded_random;
use crate::state::{board_deep_clone, BoardState, BoardType, Turn};
const AI_THIRD_MAX_UTILITY: f64 = 0.89;
#[derive(Copy, Clone, Debug, PartialEq, Eq)]
pub enum AIDifficulty {
Easy,
@ -176,25 +178,25 @@ fn get_utility_for_slot(player: Turn, slot: SlotChoice, board: &BoardType) -> Op
// check if placing a token here connects 2 pieces
if get_block_amount(player.get_opposite(), idx, 2, board) {
utility *= 1.5;
if utility >= 0.8 {
utility = 0.8;
utility *= 1.22;
if utility >= AI_THIRD_MAX_UTILITY {
utility = AI_THIRD_MAX_UTILITY;
}
}
// check if placing a token here blocks 2 pieces
if get_block_amount(player, idx, 2, board) {
utility *= 1.2;
if utility >= 0.8 {
utility = 0.8;
utility *= 1.11;
if utility >= AI_THIRD_MAX_UTILITY {
utility = AI_THIRD_MAX_UTILITY;
}
}
// check if placing a token here connects 1 piece
if get_block_amount(player.get_opposite(), idx, 1, board) {
utility *= 1.09;
if utility >= 0.8 {
utility = 0.8;
utility *= 1.05;
if utility >= AI_THIRD_MAX_UTILITY {
utility = AI_THIRD_MAX_UTILITY;
}
}
@ -330,3 +332,24 @@ fn get_block_amount(player: Turn, idx: usize, amount: usize, board: &BoardType)
// exhausted all possible potential wins, therefore does not block a win
false
}
#[cfg(test)]
mod tests {
use crate::state::new_empty_board;
use super::*;
#[test]
fn test_get_block_amount() {
let board = new_empty_board();
board[51].set(BoardState::Cyan);
board[52].set(BoardState::Cyan);
board[53].set(BoardState::Cyan);
assert!(!get_block_amount(Turn::MagentaPlayer, 50, 4, &board));
assert!(get_block_amount(Turn::MagentaPlayer, 50, 3, &board));
assert!(get_block_amount(Turn::MagentaPlayer, 50, 2, &board));
assert!(!get_block_amount(Turn::MagentaPlayer, 54, 4, &board));
assert!(get_block_amount(Turn::MagentaPlayer, 54, 3, &board));
assert!(get_block_amount(Turn::MagentaPlayer, 54, 2, &board));
}
}