这篇论文用世界杯数据证明控球率是骗人的，60%控球可能全是无效倒脚。它用视频分析区分了死球和创造空间的控球，对看球和战术分析都有启发。
该研究提出一个双层框架评估足球控球质量。第一层是事件侧垃圾控球指数，基于预期威胁网格定价控球序列，并排除领先保护性传球，在2026年世界杯103场比赛中，该指数与积分负相关（r=-0.37），与xG差负相关（r=-0.51）。第二层通过广播视频投影测量空间创造指数（SCI），在35个标记窗口中发现74%为非空间创造，19%为弱推进，6%为空间创造。该框架能区分空间创造但未转化与死球权，这是仅基于事件的有球价值模型无法做到的。
Space-Creating versus Dead Possession: An Off-Ball Possession-Quality Index for Broadcast Football
Ball possession is the most-cited and most-misleading number in football: 60% recycled in one's own half is not 60% spent pinning the opponent back. Existing event-based possession-value frameworks (expected threat, VAEP, on-ball value) price on-ball actions but ignore the off-ball question a sterile possession poses: did holding the ball create space, or was the circulation dead? We answer this in two layers. First, an event-side junk-possession index prices each possession sequence by its peak threat gain under an expected-threat grid and -- after reconstructing the live scoreline to exclude lead-protecting circulation -- flags low-threat sequences in tied-or-losing states. On the 2026 FIFA World Cup (103 matches, 206 team-matches) the flag correlates negatively with points (r=-0.37) and xG difference (r=-0.51, partly index-coupled). It is not a repackaging of on-ball value: with team offensive VAEP and field tilt held fixed, the junk flag stays strongly negatively associated with points (p<0.0001, also match-clustered) while VAEP is not significant -- in this same-match (descriptive) regression it adds information beyond this on-ball action-value model. Second, for a flagged window we resolve whether it was spatially dead or space-creating by projecting broadcast video to pitch coordinates and measuring a Space-Creation Index (SCI): a net pitch-control change capturing whether the possession seized space or pushed the opponent's block back. Across 31 of 35 flagged windows from nine World Cup matches (a purposive sample), 74% are spatially non-space-creating, 19% weak progression, and 6% space-creating windows the event flag alone would score as failure -- including a side with 73% of the ball that exited on penalties (two non-creating windows). The two layers separate space-creating-but-unconverted from sterile possession, a distinction event-only on-ball value cannot make.