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Chess-playing computer, 8 letters
Computer that performed a lot of checks in the '90s?, 8 letters
Gary Kasparov's chess competitor, 8 letters
IBM's chess machine, by way of MIT, 8 letters
Samuel L. Jackson underwater movie, 11 letters
Vast expanse (and a fitting setting for this puzzle), 11 letters
Dive preceder, perhaps, 10 letters
Diver's inspiration?, 10 letters