Central cannon vs screen horses · River chariot + mutual 7th pawns vs screen horses — trade cannon

Central cannon + river chariot + mutual 7th pawns vs trade cannon — red left horse river-linked vs black retreat edge cannon + right advisor

从C30局面开始：5. ……，炮８平９ 6. 车二平三，炮９退１ 7. 马八进七，士４进５ 8. 马七进六

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