"As we continue our journey through the fundamentals of pawn structures, we reach yet another interesting stopping point: the d5 chain pawn structure.
In chess, as ironic as it may sound, things are rarely black and white in terms of being easy to define. However, there is something you can be certain of: by studying the 17 different pawn structures and their characteristics, you will know what to do in the majority of chess positions you encounter."
D5 chain, as in chess??
"As we continue our journey through the fundamentals of pawn structures, we reach yet another interesting stopping point: the d5 chain pawn structure.
In chess, as ironic as it may sound, things are rarely black and white in terms of being easy to define. However, there is something you can be certain of: by studying the 17 different pawn structures and their characteristics, you will know what to do in the majority of chess positions you encounter."
There's that number 17 again...
https://simplifychess.com/pawn-structures/pawn-structure-101-d5-chain/index.html
That is a fake Gen Flynn account. @RealGenFlynn is the official one.