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Charles Gilman does not describe Chaturanga promotion as it was played from yr. 600 for many centuries. It looks like Chat. Pawns stop and cannot move from the last rank on any one of three conditions: (1) if at e1 or d8 (2) if at d1 or e8 and Ferse is still in play (3) if at any other square-8 and one's paired same-array-filed pieces are on board. Shatranj, overlapping historically by yr. 700, primarily changes the very promotion rule to Ferse-only (what it is eventually called), eliminating those no-promotion cases. Makruk (What's New last week) preserves to present day that 'weak-Queen' ferz promotion. To players, no promotion at times after 6 steps brings to bear strategic considerations. It can mean waiting at rank 2 or 7; or moving to 1 or 8 and not promoting, but blocking or abetting checks, or even winning by forcing stalemate.