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Giant Phoenix's life recycles every 500 years, as in ''CMVI: Promotion'' just below. So Comet Caissa is long-period every 500 years. The Body of Chess runs cyclically 500 years then regroups: precursor 8x8 Chaturanga 500-1000, weak-queen Shatranj 1000-1500, precursor mad Queen 1500-2000 all still on their own small 64 squares that computers would eventually trounce. The last lines of CMIII are describing Oort Cloud comets (not Caissa the featured) some few years hence inevitably. One counterpart (be it asteroid) once hit our dinosaur fellow craniates -- moreover chordates even vertebrates -- whose common ancestor transmits to the 10,000 surviving bird species today. The foregoing catastrophe benefiting, you always hear, the small mammals, a fortiori eventually the primates. ''A sound like furious defiant prayer'' means you'll hear the impact first in gathering, even comforting, rumble unless close enough to see one distant flash, many minutes or couple hours before choked and pummelled by debris from microscopic to the size of a house. The poem concludes, I declare, for ''the featured visitation's added layer/ One or more Comets have Earth's name on it.'' Annotation: Line 13 ''this chronology'' is additionally guarded allusion to 13th champion liberal-minded Kasparov's speculation on time frame of antiquity, for follow-up. State of denial: ''a warning look for all the mortal race'' to anyone fortunate enough to see it on trajectory telescopically in advance. [''Stop hey what's that sound Everybody look what's going down'' --Buffalo Springfield]