（さるもきからおちる）・・・その道に秀でた者でも、時には失敗することもあるというたとえ。
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Pronounced as "saru mo ki kara ochiru"... An expression for the fact that even the most skilled and talented can still fail at their specialty from time to time.

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<tn>Also tagged with "#河童の川流れ", or "#Even Kappas can drown", which is another common saying that means "even experts can make mistakes", as well as a pun on Nitori's species.</tn>

<tn>T/n: Nitori's mistake as depicted here is the "二歩/nifu" illegal move, in which a pawn is dropped on the same column as another pawn.
(Source: Shogi drop rules, 二歩/nifu illegal move) </tn>