Không rõ —
Lv Qin Chess Road - Part 3: 32 Classic Mid-Endgames #31
Lu Qin's Chess Path · 5-7 cannon vs screen horses + 3rd pawn + right horse outer river-link
Lu Qin's Chess Path · 5-7 cannon vs screen horses + 3rd pawn + right horse outer river-link
Lu Qin's Chess Path · Central cannon + river cannon vs left three-step tiger