【明報專訊】A PECULIAR PHENOMENON in Taiwanese politics to reflect on is that ever since Tsai Ing-wen was sworn in as president she has been subjected to periodic evaluations of her achievements. The first was on May 20, when one month had passed since she took office. Then it was the 100-day mark of her presidency. And, as Tsai's presidency enters its fourth month tomorrow (September 20), she is due for another performance appraisal. This has been so because she has been encountering political difficulties. She has been trying to make breakthroughs on all fronts, but little success has been achieved. But there will be an opportunity for her to do so. In 21 days she will be making her first speech on the "Double Ten Day", which is the tenth of October. That will be an opportunity for her to make a strategic breakthrough amid Taiwan's great difficulty and difficult dilemma across the Taiwan Strait.