For the curious, my takeaway from reading それでも歩は寄せてくる is that the main difference include:
- Some pieces move differently compared with their chess counterparts.
- When your piece gets near the opponent’s side (last three rows), you can opt to upgrade it (flipping the piece over to reveal the upgraded rank), allowing it to move in more directions.
- Any piece you capture join your side. You can place (drop) one captured piece on the board (pretty much anywhere?) per turn. Dropping a piece means you cannot move that turn.
I’m unfamiliar with both chess and shogi, so I’m assuming that chess may have similar handicap rules of one side starting with fewer pieces. If not, then that would be another differencee.