Creating offensive advantages during open play is fundamental to football success. However, due to the highly dynamic and long-sequence nature of open play, the potential tactic space grows exponentially as the sequence progresses, making automated tactic discovery extremely challenging. To address this, we propose TacEleven, a generative framework for football open-play tactic discovery developed in close collaboration with domain experts from AJ Auxerre, designed to assist coaches and analysts in tactical decision-making. TacEleven consists of two core components: a language-controlled tactical generator that produces diverse tactical proposals, and a multimodal large language model-based tactical critic that selects the optimal proposal aligned with a high-level stylistic tactical instruction. The two components enables rapid exploration of tactical proposals and discovery of alternative open-play offensive tactics. We evaluate TacEleven across three tasks with progressive tactical complexity: counterfactual exploration, single-step discovery, and multi-step discovery, through both quantitative metrics and a questionnaire-based qualitative assessment. The results show that the TacEleven-discovered tactics exhibit strong realism and tactical creativity, with 52.50% of the multi-step tactical alternatives rated adoptable in real-world elite football scenarios, highlighting the framework's ability to rapidly generate numerous high-quality tactics for complex long-sequence open-play situations. TacEleven demonstrates the potential of creatively leveraging domain data and generative models to advance tactical analysis in sports.

翻译：在开放进攻中创造进攻优势是足球成功的基础。然而，由于开放进攻具有高度动态性和长序列特性，随着序列推进，潜在战术空间呈指数级增长，使得自动化战术发现极具挑战性。为此，我们提出TacEleven——一个与AJ欧塞尔俱乐部领域专家密切合作开发的足球开放进攻战术发现生成框架，旨在辅助教练和分析师进行战术决策。TacEleven包含两个核心组件：语言控制的战术生成器（用于生成多样化战术提案）和基于多模态大语言模型的战术评估器（用于选择符合高层风格化战术指令的最优提案）。这两个组件能够快速探索战术提案并发现替代性开放进攻战术。我们通过渐进式战术复杂度的三项任务（反事实推演、单步发现、多步发现），结合量化指标与问卷定性评估对TacEleven进行验证。结果表明，TacEleven发现的战术展现出强烈的真实性与战术创造性，其中52.50%的多步战术替代方案被评估为可在真实世界精英足球场景中采用，凸显了该框架为复杂长序列开放进攻情境快速生成大量高质量战术的能力。TacEleven证明了创造性利用领域数据与生成模型推动体育战术分析的潜力。