The refereeing rules of the kendo matches held in the presence of Emperor Showa for the celebration of the 2,600th year of the Imperial reign: (matches were held from June 18 to the 20 in 1940) Article 9. --- Section 44. When fencers come near each other, become locked in tsubazeriai, and press their own bamboo sword against their opponent's shoulder, one of them may thrust (or thrust after forcibly toppling over) the opponent at the moment of separation, but it is not recognized as a valid thrust.
皇紀2600年奉祝昭和天覧試合剣道試合審判規定（昭和15年6月18日～20日）第9條（中略）4４、間合接近シテ鍔糶合トナリタルトキ太刀ヲ互ニ肩ニ掛ケ離レ際ニ撃突シ又ハ不正ニ倒シテ撃突スルモ勝ト認メス。