📚 Yuanshen Haikua — a Qing-dynasty endgame manual
This is one of the rare positions where the classical book and the computer argue openly. Red to move, both armies still large — Red has two chariots, two cannons, a knight; Black keeps both advisors and elephants, two knights, two chariots. The classical manual Uyên Thâm Hải Khoát (game 260) concludes: Red wins. But Fairy-Stockfish disagrees outright: by the machine's reckoning, Black checkmates Red in just 7 moves. One side has misread the whole position. The name comes from the Warring-States 'horizontal alliance' stratagem: Zhang Yi promised Chu 600 li of land to break its alliance with Qi, then delivered six. That diplomatic swindle — and the price Chu paid — is told below. A printed verdict that may itself be a '600-li promise': do you trust the old book or the machine — and can you work out which one is right?
⚖ Disputed — The Fairy-Stockfish engine (NNUE) overturns the classical book's result: Black checkmates Red in 7 moves — the main line was checked move by move, every move legal. Date checked: 2026-11-03.
約束は600里、渡されたのは6里――国家に土地を失わせた外交詐欺
秦の宰相・張儀が楚へ行き、懐王に約束した。斉と断交すれば、秦は楚に600里の土地を与えよう、と。土地に目がくらんだ王は斉と断交し、斉王を侮辱する使者まで送った。だが楚の使者が土地を受け取りに来ると、張儀はまるで違う数字を持ち出した。「六里――私自身の領地だ」六百里が六になった。そして楚が払った代価は、屈辱だけでは済まなかった。その「贈り物」の正体は何だったのか？ 『史記』（第70巻・張儀列伝）と『戦国策』が語る。張儀（紀元前373～310年）は「連衡」の売り手だった。各東方の国を個別に秦へ服従させる戦略である。対するは蘇秦の「合縦」、六国が秦に抗する縦の同盟だった。この土地事件では、楚の使者…
Stories around this position — storytelling, not part of the engine-verified content.
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