Question: What is similar of Shatranj and 18XX? 
Sentence (from "18XX"): The games "2038", set in the future, and "Poseidon" and "Ur, 1830 BC", both set in ancient history, are also regarded as 18XX titles as their game mechanics and titling nomenclature are similar despite variance from the common railroad/stock-market theme.
Relevant evidence: No