Information on Hex strategy is scarce. Here are some other resources:
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Cameron Browne, Hex Strategy: Making the Right Connections (2000)
This is the most extensive work on Hex strategy to date, and the only published book on the subject. Browne discusses the fundamental elements of tactics (connections, groups, templates, bridges, forcing moves, amongst other topics) as well as strategy on the 11×11 board. However his strategic advice, particularly with regards to the opening, is somewhat dated, and there is no discussion of corner patterns.
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Glenn C. Rhoads’ strategy guide (Basic, Intermediate and Advanced, can also be found at HexWiki)
This guide covers strategy on the 11×11 board. In addition to the usual topics (such as templates, ladders and blocking), Rhoads discusses stealing territory through intrusions and minmaxing. Rhoads also introduces a few important “tricks” such as Tom’s move and the handling of third-row ladders approaching a3.
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David Boll’s Hex FAQ (can be found on the internet archive, or at HexWiki) (1994)
This is the oldest document on Hex strategy of which I’m aware. The swap rule was not yet considered standard at this time, although it is discussed in a section on opening variations. Boll discusses bridges, a few templates (A-2, A-3 and A-4), ladders and the opening on 11×11 boards. He also provides commentary on several openings and one full game.
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Jonathan Rydh’s strategy guide (can be found on the internet archive, or at HexWiki)
Very brief but excellent overview of Hex strategy. This guide is aimed at readers who are already familiar with the game. Rydh provides no diagrams or examples, and he doesn’t discuss basics such as ladders. Rydh begins by presenting the types of connections and blocks. He then discusses the use of weak blocks to steal territory and keep the initiative, strong blocks (including minmaxing, although without that term), and then ties it together into a general strategic approach.
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This is a wiki with numerous articles on the game. In addition to mirroring some of the content above, there are also pages on individual subjects such as ladder handling, templates, and the like.