6-1-2 For the wind-up position, the pitcher is not restricted as to how he shall hold the ball. A pitcher assumes the windup position when his hands are: (a) together in front of the body; (b) both hands are at his side; (c) either hand is in front of the body and the other hand is at his side. The pitcher’s non-pivot foot shall be in any position on or behind a line extending through the front edge of the pitcher’s plate.
もしあなたが一塁走者だったとしたら
「自由な足がプレートより前にあるからセットポジションだ！」
「あれれ？自由な足を一歩引いてから投げたぞ、ワインドアップじゃないか？？？」
このハイブリットポジションでは走者が騙されますよね。
そこで2017年に作られたMLB規則
Rule 5.07(a)(2) Comment (Rule 8.01(b) Comment): With norunners on base, the pitcher is not required to come to a com-plete stop when using the Set Position. If, however, in theumpire’s judgment, a pitcher delivers the ball in a deliberateeffort to catch the batter off guard, this delivery shall bedeemed a quick pitch, for which the penalty is a ball. See Rule6.02(a)(5) Comment (Rule 8.05(e) Comment).
With a runner or runners on base, a pitcher will be presumed tobe pitching from the Set Position if he stands with his pivotfoot in contact with and parallel to the pitcher’s plate, and hisother foot in front of the pitcher’s plate,
unless he notifies theumpire that he will be pitching from the Windup Positionunder such circumstances prior to the beginning of an at-bat.A pitcher will be permitted to notify the umpire that he ispitching from the Windup Position within an at-bat only in theevent of (i) a substitution by the offensive team; or (ii) immedi-ately upon the advancement of one or more runners (i.e., afterone or more base runners advance but before the delivery ofthe next pitch).
