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"A story is told of an incident in Edo Castle. On Bunsei 6th (1823), Matsudaira Geki is said to have killed three men against whom he long held a grudge and the sword Geki used was a Muramasa.
Geki was working with 5 others in the library of Nishimaru, he suddenly got up and without a word swung his sword, at which the head of Honda Iori is supposed to have flown off at the shoulders. Toda Hikonoshin got up to run but Geki cut him down diagonally in one strke across the shoulder. Numata Sakyo was slashed across the wasit and the second stroke down at the shoulders. The three were cut down in 4 strokes. The others, Kami Goro and Mabe Genjuro tried to run but also were cut down the back and across the buttons, though the last two did not lose their lives. This will indicate the capabilities of the Muramasa blade in the hand of a fairly good swordsman."
-Excerpt from Albert Yamanaka - JSS-US article