You is clever to overcall with two diamond.
你用二方块盖叫对方很聪明。
The R2SO were later replaced by the Blue two-suiter overcalls which is more descriptive and effective.
R2SO尽和有效的蓝梅双套盖叫法取代了.
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详细解释
尽和有效的蓝梅双套盖叫法取代了.
