10. 何延錫 Ho Yen-hsi of the Sung dynasty. The personal name of this commentator is given as above by 鄭樵 Chêng Ch‘iao in the _T‘ung Chih_, written about the middle of the twelfth century, but he appears simply as 何氏 Ho Shih in the _Yü Hai_, and Ma Tuan-lin quotes Ch‘ao Kung-wu as saying that his personal name is unknown. There seems to be no reason to doubt Chêng Ch‘iao’s statement, otherwise I should have been inclined to hazard a guess and identify him with one 何去非 Ho Ch‘ü-fei, the author of a short treatise on war entitled 備論, who lived in the latter part of the 11th century.[111] Ho Shih’s commentary, in the words of the _T‘ien-i-ko_ catalogue, 有所裨益 “contains helpful additions” here and there, but is chiefly remarkable for the copious extracts taken, in adapted form, from the dynastic histories and other sources. 11. 張預 Chang Yü. The list closes with a commentator of no great originality perhaps, but gifted with admirable powers of lucid exposition. His commentary is based on that of Ts‘ao Kung, whose terse sentences he contrives to expand and develop in masterly fashion. Without Chang Yü, it is safe to say that much of Ts‘ao Kung’s commentary would have remained cloaked in its pristine obscurity and therefore valueless. His work is not mentioned in the Sung history, the _T‘ung K‘ao_, or the _Yü Hai_, but it finds a niche in the _T‘ung Chih_, which also names him as the author of the 百將傳 “Lives of Famous Generals.”[112] It is rather remarkable that the last-named four should all have flourished within so short a space of time. Ch‘ao Kung-wu accounts for it by saying: “During the early years of the Sung dynasty the Empire enjoyed a long spell of peace, and men ceased to practise the art of war. But when [Chao] Yüan-hao’s rebellion came [1038–42] and the frontier generals were defeated time after time, the Court made strenuous enquiry for men skilled in war, and military topics became the vogue amongst all the high officials. Hence it is that the commentators of Sun Tzŭ in our dynasty belong mainly to that period.”[113] Besides these eleven commentators, there are several others whose work has not come down to us. The _Sui Shu_ mentions four, namely 王凌 Wang Ling (often quoted by Tu Yu as 王子); 張子尙 Chang Tzŭ-shang; 賈詡 Chia Hsü of 魏 Wei;[114] and 沈友 Shên Yu of 吳 Wu. The _T‘ang Shu_ adds 孫鎬 Sun Hao, and the _T‘ung Chih_ 蕭吉 Hsiao Chi, while the _T‘u Shu_ mentions a Ming commentator, 黃潤玉 Huang Jun-yü. It is possible that some of these may have been merely collectors and editors of other commentaries, like Chi T‘ien-pao and Chi Hsieh, mentioned above. Certainly in the case of the latter, the entry 紀夑注孫子 in the _T‘ung K‘ao_, without the following note, would give one to understand that he had written an independent commentary of his own.