Add Hnefatafl

Hnefatafl.md

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+Here is a **clear, one-page rules summary for Hnefatafl**, written in a concise, printable format:
+
+---
+
+# **HNEFATAFL — ONE-PAGE RULES SUMMARY**
+
+## **Objective**
+
+* **Defenders (King’s side):** Help the **King escape** to any **corner square**.
+* **Attackers:** **Capture the King** before he escapes.
+
+---
+
+## **Board & Setup**
+
+* Played on a **square board** (commonly 11×11 or 13×13).
+* **King** starts in the **center (the throne)** with defenders around him.
+* **Attackers** are arranged around the edges in symmetrical formation.
+
+---
+
+## **Movement**
+
+* All pieces, including the King:
+
+  * Move **any number of open squares** orthogonally (like a rook in chess).
+  * **No diagonal moves.**
+  * Cannot **jump** over pieces.
+
+* **Special squares:**
+
+  * **Throne (center)** and **corner squares** are restricted:
+
+    * **Only the King may occupy** the throne or corners.
+    * Other pieces may **pass over** the throne but not stop on it.
+
+---
+
+## **Capturing**
+
+* Pieces are captured by **sandwiching** them between two enemies **in a straight line** (orthogonally), e.g.:
+
+  `A X A` → X is captured.
+
+* A piece may also be captured by being **pushed against the throne or a corner** with an enemy on the other side.
+
+* **Multiple captures** can occur in a single move if created simultaneously.
+
+---
+
+## **Capturing the King**
+
+* The King is **stronger**:
+
+  * **Usually requires 4 attackers** surrounding him orthogonally (“encirclement capture”).
+  * If the King is **adjacent to the throne**, fewer attackers may be required depending on variant (common: 3-sided capture).
+
+---
+
+## **Winning the Game**
+
+* **Defenders win** if the King reaches **any corner square**.
+* **Attackers win** when the King is **fully surrounded and captured**.
+
+---
+
+## **Additional Common Rules (Variant-Dependent)**
+
+* **Repetition is forbidden:** You cannot repeat the same board position.
+* **No self-capture:** A move that places your own piece between two enemies is illegal.
+* **Exit only at corners:** Edges are not escape points unless using a special variant.
+
+---
+
+If you'd like, I can also create:
+
+* A **diagrammed version** of the rules,
+* **Printable PDF**,
+* Summaries customized for a specific Tafl variant (11×11, 13×13, Brandubh, Ard Ri, Tablut, etc.).
+*