public static IEnumerable <Card> GetPairedCards(this Hand hand)
{
var pairedRanks = hand.GroupedByRank()
.Where(w => w.Count > 1)
.Select(s => s.Rank);
return(hand.Cards.Where(w => pairedRanks.Contains(w.Rank)));
}
public static bool HasThreeOfAKind(this Hand hand) => hand.GroupedByRank() .Where(w => w.Count == 3) .Any();
public static bool HasPair(this Hand hand) => hand.GroupedByRank() .Where(w => w.Count == 2) .Any();
public static bool HasTwoPair(this Hand hand) => hand.GroupedByRank() .Where(w => w.Count == 2) .Count() == 2;