After Starfleet Orion had been completed the authors, Jon Freeman and Jim Connelly, decided that the original placed too many demands on the players.
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Although he reported that the computer opponent in Invasion Orion played slowly, sometimes requiring several minutes per move, Jerry Pournelle praised the Orion games' realism: "Classical principles of fleet warfare work, and strategy and tactics are more important than luck".
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Invasion Orion is a 1979 science fiction strategy game written and published by Automated Simulations (who would become Epyx in 1983).
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