In baseball, can a pitcher start backwards and turn 180° to deliver his pitch?

control is probably more important than the small amount of velocity gained.

No.

8.01 Legal pitching delivery. There are two legal pitching positions, the Windup Position and the Set Position, and either position may be used at any time. Pitchers shall take signs from the catcher while standing on the rubber. Pitchers may disengage the rubber after taking their signs but may not step quickly onto the rubber and pitch. This may be judged a quick pitch by the umpire. When the pitcher disengages the rubber, he must drop his hands to his sides. Pitchers will not be allowed to disengage the rubber after taking each sign.
(a)The Windup Position. The pitcher shall stand facing the batter, his entire pivot foot on, or in front of and touching and not off the end of the pitcher's plate, and the other foot free. From this position any natural movement associated with his delivery of the ball to the batter commits him to the pitch without interruption or alteration. He shall not raise either foot from the ground, except that in his actual delivery of the ball to the batter, he may take one step backward, and one step forward with his free foot. When a pitcher holds the ball with both hands in front of his body, with his entire pivot foot on, or in front of and touching but not off the end of the pitcher's plate, and his other foot free, he will be considered in the Windup Position. The pitcher may have one foot, not the pivot foot, off the rubber and any distance he may desire back of a line which is an extension to the back edge of the pitcher's plate, but not at either side of the pitcher's plate. With his "free" foot the pitcher may take one step backward and one step forward, but under no circumstances, to either side, that is to either the first base or third base side of the pitcher's rubber. If a pitcher holds the ball with both hands in front of his body, with his entire pivot foot on or in front of and touching but not off the end of the pitcher's plate, and his other foot free, he will be considered in a windup position. From this position he may:
(1) deliver the ball to the batter, or
(2) step and throw to a base in an attempt to pick off a runner, or
(3) disengage the rubber (if he does he must drop his hand to his sides). In disengaging the rubber the pitcher must step off with his pivot foot and not his free foot first. He may not go into a set or stretch position - if he does it is a balk.
(b) The Set Position. Set Position shall be indicated by the pitcher when he stands facing the batter with his entire pivot foot on, or in front of, and in contact with, and not off the end of the pitcher's plate, and his other foot in front of the pitcher's plate, holding the ball in both hands in front of his body and coming to a complete stop. From such Set Position he may deliver the ball to the batter, throw to a base or step backward off the pitcher's plate with his pivot foot. Before assuming Set Position, the pitcher may elect to make any natural preliminary motion such as that known as "the stretch." But if he so elects, he shall come to Set Position before delivering the ball to the batter. After assuming Set Position, any natural motion associated with his delivery of the ball to the batter commits him to the pitch without alteration or interruption. Preparatory to coming to a set position, the pitcher shall have one hand on his side; from this position he shall go to his set position as defined in Rule 8.01 (b) without interruption and in one continuous motion. The whole width of the foot in contact with the rubber must be on the rubber. A pitcher cannot pitch from off the end of the rubber with just the side of his foot touching the rubber. The pitcher, following his stretch, must
(a) hold the ball in both hands in front of his body and

/thread

I love to play with chatgpt on my phone. I tested it with this question, it failed and said yes. Interesting...