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Re: Jetan.
Larry Smith, for reasons unknown to me, liked to exaggerate the inconsistencies found in Burroughs' novel The Chessmen of Mars. In reality, there are only a couple of real inconsistencies, although it is true that due to Burroughs' vague wording, jetan has sometimes been played with alternative rules.
Consistent rules can be found in connection with my jetan articles in ERBzine and Abstract Games, and not least in my book Jetan: The Martian Chess of Edgar Rice Burroughs (McFarland, 2022).
CVP has Billiards Progressive Chess link that shows Gilman is right that, as Queen can be double-pathed off one bounce (to certain squares), both Bishop and Q qualify off two or three reflections as dual-pathed. For Betza's Rose too, I think however return all the way to departure square after full circuit is better dis-allowed, though not a null move since they may be blocked. Thanks for suggestion of Crooked Bishop for follow-up, 'Multipath' being more general category than 'Leaper' or 'Rider' and having countless examples. http://www.thegamesjournal.com/articles/DefiningtheAbstract.shtml http://www.chessvariants.org/index/msdisplay.php?itemid=MSpartnershipcha
Billiard Bishops can sometimes be multi-path, depending on the nature of the bounce and how many edges it applies to. Another group of multi-path pieces, at least as regards their even moves, includes the Crooked Bishop, Crooked Rook, and their compounds with each other and with straight riders.
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Oh, and one more thing regarding jetan rules: The appendix rules were probably not Burroughs' revision of the rules. They were probably the original rules, as written before Burroughs even started on the novel text. The simplified rules in Chapter two clarify nothing, and are interesting only because of the statement that the thoat can jump, not given in the appendix.