So for a pawn to be promoted, at least one other pawn has to be removed from the board

Not quite. It is that at least one other piece has to be removed from the board. A white pawn could advance past its black neighbour in the next column then take a black non-pawn piece in that column thereby side-stepping the black pawn in its original column. So a piece has to be removed, just not necessarily a pawn, and therefore that piece does not necessarily have the option of promotion. So a single pawn could be promoted without the possibility of denying promotion to any of the remaining pawns.

🦛

In reply to Re^3: [OT] Is It Possible To Serialize A Chess Board In Fewer Than 23 Bytes? by hippo
in thread [OT] Is It Possible To Serialize A Chess Board In Fewer Than 23 Bytes? by Limbic~Region

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