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1997 was a big year for naming pieces Medusa. The naming of Medusa is the lead-in to this 1997 Betza article. Ralph Betza calls 'Medusa' a piece like Immobilizer but instead of adjacency, the mechanism for immobilizing is whether the piece attacks the Medusa(causing the same Immobilizing on attacker as Immobilizer). Also in 1997 pamphlet 'How To Play Medusa Chess', also precisely the lead-in for 'PoM', Gary Gifford calls 'Medusa' an equivalent to 1960's Ultima Immobilizer(one-, two- or three-stepping) plus normal captures. Gifford must have been aware of Ultima if not web-based Chess Variants. [Anyone please inform if knowing Betza's Medusa is used elsewhere; we suspect other CVs even by JJoyce or GGifford or JGood themselves may have that we glanced but have not reached again, yet it seems to originate here with Betza; and welcome any corrections]