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 edge cannon vs black retreat edge cannon + right advisor + right direct chariot

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. 炮八平九，车１平２

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