Expert System - Sailing Ships by McGoo Software

Based on the responses you have made:

The vessel is probably a Full-rigged sailing ship

Conclusion Notes:

This ship has 3 or more masts with square sails on all masts

Expert System Rule:

IF the number of masts on the vessel is 3 or more
AND there are square sails on all masts
THEN the vessel is probably a Full-rigged sailing ship.

Calculated Certainty Factor: 0.61 = probably