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Bismarck
Surprise Attack Summary (rule 41.0) for the Avalon Hill board game
  1. May only occur in visibility ≥ 5.
  2. Attacker selects a target.
  3. If defender's Evasion Rating is higher than attacker's, the attacker rolls 2 dice and subtracts the visibility from the sum.
  4. If this number ≤ 1, he must attack.
  5. If this humber > 1, he must choose a new target or not attack at all.
  6. Night adds 5 to the visibility.
  7. X visibility is considered a 9.
  8. Surprise attacks may be made automatically by shipts that are being shadowed.

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