Editing List of chess variants (section)

==== Player-chosen positions ====
* '''Casablanca chess''': The starting position is chosen from a famous historic game; usually an interesting [[Chess middlegame|middlegame]] position. The position is verified to be approximately equal by a computer, and should have winning chances for both sides.<ref>{{cite web |url=https://www.mcw.ma/_files/ugd/78af52_eae053e1b06c453cb43fb1d00a7f045a.pdf |title=Casablanca variant for website |access-date=20 May 2024 |archive-date=20 May 2024 |archive-url=https://web.archive.org/web/20240520223547/https://www.mcw.ma/_files/ugd/78af52_eae053e1b06c453cb43fb1d00a7f045a.pdf |url-status=live }}</ref> The first Casablanca chess tournament was played in May 2024, and won by [[Magnus Carlsen]].<ref>{{cite web |title=The Tournament |url=https://www.mcw.ma/en/le-tournoi |website=Casablanca-Chess |access-date=20 May 2024 |language=en |archive-date=20 May 2024 |archive-url=https://web.archive.org/web/20240520223546/https://www.mcw.ma/en/le-tournoi |url-status=live }}</ref><ref>{{cite web |last1=Lang |first1=J. J. |title=Learning From the Classics: Takeaways from First Casablanca Variant Tournament in Morocco |url=https://new.uschess.org/news/learning-classics-takeaways-first-casablanca-variant-tournament-morocco |website=US Chess.org |access-date=20 May 2024 |language=en |date=20 May 2024 |archive-date=20 May 2024 |archive-url=https://web.archive.org/web/20240520222203/https://new.uschess.org/news/learning-classics-takeaways-first-casablanca-variant-tournament-morocco |url-status=live }}</ref>
* '''Pre-chess''': The game starts with white and black pawns set as usual, but the initial position of other pieces is selected by the players. White first places one of their pieces on their first rank, and then Black does the same. Players continue to alternate in this manner until all pieces have been placed, with the only restriction being that bishops must be on opposite-colour squares. The game then proceeds in the usual way. Proposed by [[Pal Benko]] in 1978.{{sfnp|Pritchard|2007|p=77}}
* '''Polgar reform chess''' [multivariant]: In his book ''Reform-Chess'' (1997), [[László Polgár]] proposed several variants played on board of size 5×8, 6×8, 8×6, or 9×6.<ref>{{cite book |author=László Polgár |title=Reform-Chess |publisher=Könemann Verlags GmbH |year=1997 |isbn=978-3-89508-226-9|author-link=László Polgár }}</ref> The initial piece setup is determined by players in the same way as in Benko's Pre-chess. There are special rules for [[castling]] depending on the board. Polgár recommended these variants to train creativity and to speed up the game.