プレイングミス

noun

player error; playing mistake

Wasei-eigo term used mainly in collectible card games and similar contexts to refer to a mistake made by a player during play, as opposed to a deck-building error. Broader use for any player mistake is possible but less common.

wasei-eigo (Japanese-coined English), from playing miss

• あのプレイングミスがなければ勝かてたかもしれない。

  If it weren't for that playing mistake, I might have won.

• 初しょ心しん者しゃはプレイングミスを減へらすことが上じょう達たつの近ちか道みちだ。

  For beginners, reducing player errors is the fastest way to improve.