On Kaiserspiel (Emperor's game), Sultanspiel (Sultan's game), Peguilhen and L. Tressan:
Kaiserspiel was clearly described in 1819 and attributed to some Peguilhen. It contains the Amazon (named Feldherr in original German, English translations include General and Commander. Probably the more clumsy "Commander in Chief" is a better translation. It also contains the Bishop-Knight piece under the name Adjutant. L. Tressan republished this game with slight amendments but did not change the pieces and their names. The addition of the Rook-Knight piece named Admiral than was pondered, but discarded because of the unusual board size needed (11x11)
Sultanspiel (Sultan's game) was first published by L. Tressan in 1840 and it contains the Rook-Knight piece in addition to the pieces known from Kaiserspiel. The piece is named Marschall (Marshal) there.
Now to the more difficult part: Virtually nothing is known about the person L. Tressan. It appears in a Chess book bibliography by Oettinger under the name "Ludwig Tressau", but I think that the given name is just an extrapolation from the initial by the bibliographer, and that the last letter is plain wrong, it should be an n, not a u (from inspecting the title page of the scanned book, I read clearly a Fraktur n at the end of the name; Google also reads L. Tressan). We do not even know if L. Tressan was male or female, their consistent hiding behind an abbreviation makes me think of a woman named Louise or Luise.
Suggestions for edits:
Correct all appearances of Ludwig Tressan to L. Tressan; try to avoid pronouns for L. Tressan (repeat the name, use the article "the" in place of "his", or use singular they)
Disentagle Emperor's Game (attributed to Peguilhen, ca. 1815) and Sultan's game (attributed to L. Tressan, 1840).
In the description of Marshall, you can add at your discretion the factoid that Peguilhen (1815) pondered about a game including this piece under the name "Admiral" but discarded that idea.
P.S. You may find the following article, also including Hyderabad Decimal Chess, interesting: https://sciendo.com/article/10.2478/bgs-2022-0017 (The author, Geori Markov, goes for Ludwig Tressau what I consider an error be Oettinger)
On Kaiserspiel (Emperor's game), Sultanspiel (Sultan's game), Peguilhen and L. Tressan:
Kaiserspiel was clearly described in 1819 and attributed to some Peguilhen. It contains the Amazon (named Feldherr in original German, English translations include General and Commander. Probably the more clumsy "Commander in Chief" is a better translation. It also contains the Bishop-Knight piece under the name Adjutant. L. Tressan republished this game with slight amendments but did not change the pieces and their names. The addition of the Rook-Knight piece named Admiral than was pondered, but discarded because of the unusual board size needed (11x11)
Sultanspiel (Sultan's game) was first published by L. Tressan in 1840 and it contains the Rook-Knight piece in addition to the pieces known from Kaiserspiel. The piece is named Marschall (Marshal) there.
Now to the more difficult part: Virtually nothing is known about the person L. Tressan. It appears in a Chess book bibliography by Oettinger under the name "Ludwig Tressau", but I think that the given name is just an extrapolation from the initial by the bibliographer, and that the last letter is plain wrong, it should be an n, not a u (from inspecting the title page of the scanned book, I read clearly a Fraktur n at the end of the name; Google also reads L. Tressan). We do not even know if L. Tressan was male or female, their consistent hiding behind an abbreviation makes me think of a woman named Louise or Luise.
Suggestions for edits:
Correct all appearances of Ludwig Tressan to L. Tressan; try to avoid pronouns for L. Tressan (repeat the name, use the article "the" in place of "his", or use singular they)
Disentagle Emperor's Game (attributed to Peguilhen, ca. 1815) and Sultan's game (attributed to L. Tressan, 1840).
In the description of Marshall, you can add at your discretion the factoid that Peguilhen (1815) pondered about a game including this piece under the name "Admiral" but discarded that idea.
P.S. You may find the following article, also including Hyderabad Decimal Chess, interesting: https://sciendo.com/article/10.2478/bgs-2022-0017 (The author, Geori Markov, goes for Ludwig Tressau what I consider an error be Oettinger)