Merge remote-tracking branch 'refs/remotes/origin/ai' into ai

uttt.c

@@ -892,7 +892,7 @@ int ut_alphabetaq(const struct ut_state *state, struct ut_move move, int depth,
 	}
 	return q;
 }
-#define UT_DEPTH 5
+#define UT_DEPTH 6
 struct ut_move ut_minimax(const struct ut_state *state)
 {
 	struct ut_move best_move = {-1, -1};
@@ -901,7 +901,7 @@ struct ut_move ut_minimax(const struct ut_state *state)
 	for(int c = 0; c < 9; c++)
 	{
 		struct ut_move move = (struct ut_move){r, c};
-		int q = ut_alphabetaq(state, move, UT_DEPTH, UT_VALUEMIN - 1, UT_VALUEMAX + 1);
+		int q = ut_alphabetaq(state, move, UT_DEPTH - 1, UT_VALUEMIN - 1, UT_VALUEMAX + 1);
 		if((state->player == 'X') ? q > best_q : q < best_q)
 		{
 			best_q = q;