Ftex -

In standard chess notation, is not a valid piece abbreviation (the standard abbreviations are K, Q, R, B, N, P).

Could you provide the context (e.g., "ftex moves like a ___")? I can give you the exact definition from the specific fairy chess problem you're looking at. In standard chess notation, is not a valid

However, you are likely thinking of or a specific chess variant. Here is the most probable match: In standard chess notation

It sounds like you are referencing as a chess piece. In standard chess notation, is not a valid