You is clever to overcall with two diamond.
你方块对方很聪明。
The R2SO were later replaced by the Blue two-suiter overcalls which is more descriptive and effective.
R2SO后来更详尽和有效的蓝梅双套法取代了.
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详细解释
方块
对方很聪明。
更详尽和有效的蓝梅双套
