U. Abstract and Hypothetical Scenariosua. Alternate World | ARDA | Variant | Rules | Designer | Players | Notes |
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| ua01 | Global Diplomacy I | | Lew Pulsipher | 7 | | | ua02 | Timesteps | | Lew Pulsipher | | |
uc. Map constructed before Game | ARDA | Variant | Rules | Designer | Players | Notes |
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| uc01 | Ptolemaic Diplomacy | | Peter Berlin | 7 | | | uc02 | Twilight Zone Diplomacy | Rules | Peter Berlin | 7 | |
ud. Map constructed during Game | ARDA | Variant | Rules | Designer | Players | Notes |
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| ud01 | Quantum Space | | T. McCloud | | | | ud02 | Fiat Lux | | Greg Costikyan | | | | ud03 | The Sundered Worlds | | Steve Doubleday | | | | ud04 | Quantum Space:3001 | | Glenn Overby | | |
ue. Map discovered During Game | ARDA | Variant | Rules | Designer | Players | Notes |
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| ue01 | 1492 | Rules | Edwin Godfrey | 4 | |
ug. Geometrical (perfectly balanced) Board | ARDA | Variant | Rules | Designer | Players | Notes |
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| ug01 | Barebones, Jeffersonian Diplomacy | | Howard Mahler | 8 | | | ug02 | Logical Diplomacy I | | Allan Ovens | 6 | | | ug03 | Logical Diplomacy II | | Lew Pulsipher | 5 | | | ug04 | Lunatic Diplomacy I | | Thomas Galloway | | | | ug05 | Pink Diplomacy | | David Pink | 7 | | | ug06 | Space Station Ultra | | Lee Kendter, Sr. | 5 | | | ug07 | Lunatic Diplomacy II | | Thomas Galloway | | | | ug08 | Purest Diplomacy | | Roland Prevot | 7 | | | ug09 | Space War | | D. Alderson | 4 | | | ug10 | Lunatic Diplomacy III | | Thomas Galloway | 6 | | | ug11 | Slaughter Diplomacy | | Fred Davis | 7 | | | ug12 | Five Italies (Kathy Byrne Variant) | Rules | Mike Lee | 5 | | | ug13 | Existential Diplomacy | | Marc Hurwitz | 3 | | | ug14 | Total Balance II | | Steve Agar and Andrew Poole | 8 | | | ug15 | Masters of the Vortex | | Richard Egan, Andy Bate and Thomas Galloway | 8 | | | ug16 | Chromatic Diplomacy | Rules | James Millington, Robert Schone and Lynsey Smith | 5 | Also called Romans (with different province names) | | ug17 | Migraine Diplomacy | Rules | Stephen Koehler | 8 | |
uh. Hybrid Games | ARDA | Variant | Rules | Designer | Players | Notes |
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| uh01 | Diplochess | Rules | Edi Birsan and Fred Davis | 2 | | | uh02 | Dip-Tac-Toe | Rules | Fred Davis | 4 | | | uh03 | Diplomatic Chess | | Mark Larzelere | 3 | | | uh04 | Hickeryville | | Graham McAllion | 7 | | | uh05 | Scacchomacy (Fish’s Delight) | | Dave Kadlecek | 7 | |
um. Board is a Maze | ARDA | Variant | Rules | Designer | Players | Notes |
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| um01 | Algernon Diplomacy | Rules | Thomas Galloway | | |
un. No board at all | ARDA | Variant | Rules | Designer | Players | Notes |
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| un01 | Lizard | | K. St. Andre | | |
ur. Hypothetical Board with random and chaotic changes | ARDA | Variant | Rules | Designer | Players | Notes |
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| ur01 | Geo-Shift Diplomacy | | Peter Aronsen and Lew Pulsipher | | |
us. Stock / Currency controls / influences | ARDA | Variant | Rules | Designer | Players | Notes |
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| us01 | Hyperbourse | | Tom Swider | | | | us02 | Capitalist Diplomacy | Rules | Dave Tant | | | | us03 | Superbourse | | Richard Sharp | | | | us04 | Stock Diplomacy | | Craig Nye and Steve Doubleday | 7 | | | us05 | Dow Jones Diplomacy | | Andy Mansfield | 7 | | | us06 | Speculation | | Douglas Huskins | | | | us07 | Capitalist-Dippy | | Lukas Kautzsch | | | | us08 | Capitalist-Dippy II | | Per Westling | | | | us09 | Gain Diplomacy | | Mike Benyon | | | | us10 | Capitalist Diplomacy (circa 1897) | Rules | Kerry Slavin | 7 | |
uu. Hypothetical Geographic Area | ARDA | Variant | Rules | Designer | Players | Notes |
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| uu01 | Ancient Empires I | | John Boyer | 5 | | | uu02 | Antigone Isles | | Doug Hayward | 7 | | | uu03 | Cat Diplomacy | | Ernie Melchior | 3 | | | uu04 | Colonial Variant | | Glenn Reed and Peter Berggren | 7 | | | uu05 | Empire I | | W. Johnson | 10 | | | uu06 | Mythomacy II | | Don Miller | 6 | | | uu07 | Slobbovia II | | Robert Blau | | | | uu08 | Amoeba | | Ken St. Andre and Jimmy Walker | | | | uu09 | Sea Diplomacy | | W. Johnson | 8 | | | uu10 | Empire II | | Johnson and St. Andre (requires uu05) | 9 | | | uu11 | Carthage | | Hartley Patterson | | | | uu12 | Heptaspherical Diplomacy | | John Dodds and Angus Walker | 7 | | | uu14 | Mobtown II | Rules | Stephen Agar and Nick Morris | 6 | | | uu16 | SAGA-R | | Steve Agar and Andrew Poole | 8 | | | uu17 | Archipelago I | | Joe Chambers and Jon Miller | 6 | | | uu18 | Archipelago II | | Martin Draper | 6 | | | uu20 | Atlantis Time’s Diplomacy | | Davide Cleopadre | 5 | | | uu21 | Battleisle | Rules | René Krokowski and Frank Bacher | 6 | | | uu22 | Reversed Diplomacy | Rules | Ricardo Moraes | 5 | |
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