Central cannon vs screen horses · River chariot + 7th-file horse vs screen horses — two-headed snake

Central cannon + river chariot + 7th horse vs two-headed snake — red left lateral chariot trade twin pawns vs black high right cannon

从C20局面开始：6. 车九进一，炮２进１ 7. 车二退二，象３进５ 8. 兵三进一，…… 9. 兵七进一

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