This doesn't explain the fact that in Heian Shogi and Sho Shogi, the Knight has the same movement as in today's Shogi. My pet theory on this and the Lance's forward-only slide is that the Bushido Code has something to do with it. The Bushido code, which says surrender is the worst dishonor, and by proxy shames cowardice, may have been inprinted on the game by making certain pieces forward-only.
This doesn't explain the fact that in Heian Shogi and Sho Shogi, the Knight has the same movement as in today's Shogi. My pet theory on this and the Lance's forward-only slide is that the Bushido Code has something to do with it. The Bushido code, which says surrender is the worst dishonor, and by proxy shames cowardice, may have been inprinted on the game by making certain pieces forward-only.