ruleSetBackgammon = ruleSetLookup [
    ("crawford"                 , Crawford),
    ("crawford:crawfordgame"    , CrawfordGame),
    ("jacoby"                   , Jacoby)
    ]
ruleSetBackgammon = ruleSetLookup [
    ("crawford"                 , Crawford),
    ("crawford:crawfordgame"    , CrawfordGame),
    ("jacoby"                   , Jacoby)
    ]
ruleSetBackgammon = ruleSetLookup [
    ("crawford"                 , Crawford),
    ("crawford:crawfordgame"    , CrawfordGame),
    ("jacoby"                   , Jacoby)
    ]