Question: Which game was invented first, X-COM or Summit?

full_context: Document 1: Sigma I-67 and II-67 war games: The Sigma I-67 and II-67 War Games were two of a series of classified high level war games played in the Pentagon during the 1960s to strategize the conduct of the burgeoning Vietnam War. The games were designed to replicate then-current conditions in Indochina, with an aim toward predicting future foreign affairs events. They were staffed with high-ranking officials standing in to represent both domestic and foreign characters; stand-ins were chosen for their expertise concerning those they were called upon to represent. The games were supervised by a Control appointed to oversee both sides. The opposing Blue and Red Teams customary in war games were designated the friendly and enemy forces as was usual; however, several smaller teams were sometimes subsumed under Red and Blue Teams. Over the course of the games, the Red Team at times contained the Yellow Team for the Peoples Republic of China, the Brown Team for the Democratic Republic of Vietnam, the Black Team for the Viet Cong, and Green for the USSR.
Document 2: X-COM: X-COM (sometimes stylized as "X-Com") is a science fiction video game franchise featuring an elite international organization tasked with countering alien invasions of Earth. The series began with the strategy video game "" created by Mythos Games and MicroProse in 1994. The original line up by MicroProse included six published and at least two cancelled games, as well as two novels. The "X-COM" series, in particular its original entry, achieved a sizable cult following and has influenced many other video games; including the creation of a number of clones, spiritual successors, and unofficial remakes.
Document 3: Summit (meeting): A summit meeting (or just summit) is a meeting of heads of state or government, usually with considerable media exposure, tight security, and a prearranged agenda. Notable summit meetings include those of Franklin D. Roosevelt, Winston Churchill, and Joseph Stalin during World War II. However, the term summit was not commonly used for such meetings until the Geneva Summit (1955). During the Cold War, when American presidents joined with Soviet or Chinese counterparts for one-on-one meetings, the media labelled the event as a "summit". The post–Cold War era has produced an increase in the number of "summit" events. Nowadays, international summits are the most common expression for global governance.
Document 4: Twilight Struggle: Twilight Struggle: The Cold War, 1945–1989 is a card-driven strategy game for two players, with its theme taken from the Cold War. One player plays the United States (US), and the other plays the Soviet Union (USSR). The game takes its title from John F. Kennedy's inaugural address:
Document 5: Codo Technologies: Codo Technologies was a video game developer founded by Julian Gollop and others, including brother Nick Gollop, continuing the line of sophisticated strategy war games started at their previous company Mythos Games. Gollop is especially known for his role in the creation of the "X-COM" video game series. Codo Technologies has released two games: "Laser Squad Nemesis", a PC turn-based tactics game and "", a Game Boy Advance turn-based tactical role-playing game. In late 2010, Codo Technologies closed up shop, shortly after negotiating turning control of the "Laser Squad Nemesis" servers and maintenance to the long term fans of the game.
Document 6: Races of StarCraft: Blizzard Entertainment's real-time strategy game series "StarCraft" revolves around interstellar affairs in a distant sector of the galaxy, with three species and multiple factions all vying for supremacy in the sector. The playable species of "StarCraft" include the Terrans, humans exiled from Earth who excel at adapting to any situation; the Zerg, a race of insectoids obsessed with assimilating other races in pursuit of genetic perfection; and the Protoss, a humanoid species with advanced technology and psionic abilities, attempting to preserve their civilization and strict philosophical way of living from the Zerg. Each of these races has a single campaign in each "StarCraft" real-time strategy game. In addition to these three, various non-playable races have also been part of the lore of the "StarCraft" series; the most notable of these is the Xel'Naga, a race which features prominently in the fictional histories of the Protoss and Zerg races.
Document 7: Sigma I-66 war game: The Sigma I-66 war game was one of a series of classified high level war games played in The Pentagon during the 1960s to strategize the conduct of the burgeoning Vietnam War. These simulations were designed to replicate then-current conditions in Indochina, with an aim toward predicting future foreign affairs events. They were staffed with high-ranking officials standing in to represent both domestic and foreign characters; stand-ins were chosen for their expertise concerning those they were called upon to represent. The games were supervised by a Control appointed to oversee both sides. The opposing Blue and Red Teams customary in war games were designated the friendly and enemy forces as was usual; however, several smaller teams were sometimes subsumed under Red and Blue Teams. Over the course of the games, the Red Team at times contained the Yellow Team for the Peoples Republic of China, the Brown Team for the Democratic Republic of Vietnam, the Black Team for the Viet Cong, and Green for the USSR.
Document 8: X-COM (Email games): X-COM (also X-COM: First Alien Invasion) was part of a budget range video game series released in 1999 by Hasbro Interactive for Windows that relied solely on the "Play by mail" concept.
Document 9: Diplomacy (game): Diplomacy is a strategic board game created by Allan B. Calhamer in 1954 and released commercially in 1959. Its main distinctions from most board wargames are its negotiation phases (players spend much of their time forming and betraying alliances with other players and forming beneficial strategies) and the absence of dice and other game elements that produce random effects. Set in Europe before the beginning of World War I, "Diplomacy" is played by two to seven players, each controlling the armed forces of a major European power (or, with fewer players, multiple powers). Each player aims to move his or her few starting units and defeat those of others to win possession of a majority of strategic cities and provinces marked as "supply centers" on the map; these supply centers allow players who control them to produce more units.
Document 10: X-COM: Enforcer: X-COM: Enforcer is the fifth game in the "X-COM" series, but takes place in a time line separate to that established by the first four games of the series. "Enforcer" is as a purely action third-person shooter, not containing elements of strategy game unlike the previous games. It was the last game released in the series until Firaxis Games' 2012 .
Document 11: X-COM: Alliance: X-COM: Alliance is a cancelled video game in the "X-COM" series. The game was developed by three different teams of MicroProse developers (first as a subsidiary of Spectrum Holobyte, then Hasbro Interactive, and finally Infogrames Entertainment) between 1995 and 2002. Its initial working title was "X-COM 4" (later "X-COM 5"); the project was code-named "Fox Force Five" to stop media leaks. The game had the player assume the role of commander of the militarized scientific mission lost in space during the aftermath of "".
Document 12: Alien (creature in Alien franchise): The "Alien" (also referred to as "Xenomorph XX121") is a fictional endoparasitoid extraterrestrial species that is the eponymous antagonist of the "Alien" film series. The species made its debut in the film "Alien" (1979), and reappeared in the sequels "Aliens" (1986), "Alien 3" (1992), and "" (1997), as well as the crossover franchise "Alien vs. Predator" (2004) and "" (2007). A similar creature of a slightly different design named the "Deacon" makes a brief appearance in the Ridley Scott film "Prometheus" (2012). Two species, one being a different but similar creature called a "Neomorph" and the other being a variation of the Xenomorph XX121 species appear in the sequel to "Prometheus", "" (2017), which reveals the potential origin of the species. In addition, the Alien appears in various literature and video game spin-offs from the franchises.
Document 13: Axis &amp; Allies: Axis & Allies is a series of World War II strategy board games. Originally designed by Larry Harris and published by Nova Game Designs in 1981, the game was republished by the Milton Bradley Company in 1984 as part of the "Gamemaster Series" of board games. This edition has been retroactively named Axis & Allies: Classic to differentiate it from later revisions. In 1996, "Axis & Allies: Classic" was inducted into the Academy of Adventure Gaming Arts & Design "Adventure Gaming Hall of Fame". "Games" magazine also has inducted "Axis & Allies" into their buyers' guide Hall of Fame, an honor the magazine extends to "games that have met or exceeded the highest standards of quality and play value and have been continuously in production for at least 10 years; i.e., classics."
Document 14: Summit (game): Summit is a Cold War board wargame introduced in 1961 by Milton Bradley as "The Top Level Game of Global Strategy", with an updated release in 1971. Each player chooses one of the major powers from the 1950s/1960s era and controlled their economic and military buildup during each turn, much like Risk.
Document 15: Sigma war games: The Sigma war games were a series of classified high level war games played in the Pentagon during the 1960s to strategize the conduct of the burgeoning Vietnam War. The games were designed to replicate then-current conditions in Indochina, with an aim toward predicting future events in the region. They were staffed with high-ranking officials standing in to represent both domestic and foreign characters; stand-ins were chosen for their expertise concerning those they were called upon to represent. The games were supervised by a Control appointed to oversee both sides. The opposing Blue and Red Teams customary in war games were designated the friendly and enemy forces as was usual; however, several smaller teams were sometimes subsumed under Red and Blue Teams. Over the course of the games, the Red Team at times contained the Yellow Team for the People's Republic of China, the Brown Team for the Democratic Republic of Vietnam, the Black Team for the Viet Cong, and Green for the USSR.
ground_truth: Summit