Oi Navarcoi! is a game about formations and timing. Squadrons operate in distinct classical formations—epi mias (line), epi pollon (depth), epi keras (column), and kyklos (defensive circle)—each with clear advantages and tradeoffs in movement and combat. Ancient naval formations are often mentioned in period sources but rarely utilized in wargaming rules as more than a passing reference. This is a game built around those classical formations.

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The turn sequence is clean and consistent: event, movement, melee, and morale. Movement emphasizes formation changes and maneuvering for advantage, while combat is resolved quickly using a unified system of 2d6 tests.

Most key actions—melee resolution, morale checks, maneuver tests, and special tactics like diekplous and periplous—require rolling 2d6 against target numbers, typically needing a 5+ or 6+ to succeed.

This creates a system where:

• Outcomes are fast and easy to resolve

• Success rates are generally favorable (often in the 70–80% range before modifiers)

• Modifiers, positioning, and formation still matter, but within a relatively forgiving probability curve

In practice, this means battles tend to flow smoothly, with formations holding together and executing plans more often than not. At the same time, when multiple tests stack—particularly in melee and morale—the system can produce sudden swings, reflecting the fragile nature of ancient command and control.

A particularly strong feature is the signals system, which allows players to pre-plan maneuvers and execute them more reliably during the battle. This reinforces the central theme of the game: that success is rooted in preparation and coordinated action rather than reactive micromanagement.

Victory is determined by inflicting sufficient losses—typically around half of the opposing squadrons—and then successfully triggering a collapse, meaning that once a battle reaches a tipping point, the end can come quickly.