牵制动作
Also known as: 传向一垒的牵制, 牵制传球
牵制动作是投手在垒上有跑垒员时，向某个垒包做出的合法传球（或跨步动作），目的是在投球之前把该跑垒员逮个正着。
牵制动作的存在，既是为了实际抓出局数，也是为了控制跑垒局面——大多数牵制尝试并不能真正抓到跑垒员，但一个快速、多变的动作能缩短跑垒员的离垒距离，扰乱其盗垒时机。从固定式姿势出发，投手可以跨步传向一垒，转身传向二垒（由游击手或二垒手接应掩护），或者干脆离开投手板重新开始。每种动作的合法性都受到严格规则约束，涉及哪只脚先动、投手是否完全脱离投手板——违反规则会被判投手犯规。
有效的牵制动作会变化自己的节奏（快、拖、再快），让跑垒员无法单纯靠数节奏来掐准起跑时机。左投手在牵制一垒跑垒员时天生占优势，因为他们从固定式姿势出发就能正面面对一垒；而右投手更多依赖快速的动作和具有欺骗性的第一个动作，才能在一垒方向有真正的机会。
Example
左投手两次变化抬腿的节奏，最后突然一记快速的牵制传球投向一垒，逮到了重心偏向错误方向的跑垒员。
Why it matters
投手的传向本垒时间以及牵制动作的质量，直接影响防守方在多大程度上能控制跑垒局面——一个缓慢、可预测的动作，等于给每一名跑垒员都开了绿灯。
How it shows up on video
On video, an effective pickoff move shows a quick, compact first movement with minimal telegraphing. This means no extra head turn or shoulder dip that tips the throw before the front foot moves. Timing between moves should vary rep to rep rather than following a fixed pattern.
Common mistakes
- Using the exact same timing and move every time, letting a baserunner count the pattern and time their jump precisely
- Committing an illegal motion (an extra hitch, or moving the free foot before disengaging) that gets ruled a balk
- Prioritizing pickoff attempts so heavily that the pitcher loses focus on the actual pitch to the plate
In SwingVantage Motion Lab
SwingVantage Motion Lab can time a pitcher's move-to-first sequence and compare it against the delivery to home. This shows whether the pickoff move and the pitching motion are different enough to keep a runner honest.
Frequently asked questions
投手可以做多少次牵制尝试？
规则并未限制次数，不过大多数正式比赛级别对每个打席的离板/脱离动作次数有限制（通常是两次），超过之后再次未成功的尝试将被判投手犯规，除非该次尝试造成了出局。
为什么左投手在牵制上有优势？
左投手在固定式姿势中正面面对一垒，能更清楚地观察跑垒员，传球路径也比右投手更短、更自然——右投手必须转身背对本垒才能看到一垒。
Related terms
Related guides & benchmarks
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