private Card Play_OnSuit()
{
if (BookCards.All(x => x.Suit != "s")) // Book has not been trumped
{
if (!PartnerWinning)
{
if (BookCards.Count == 3 || (BookCards.Count == 2 && Logic.LeftBid <= 0))
{
// All other players have played a card, opposing team is winning.
var overCards =
Logic.HandCards.Where(x => x.Suit == LeadCard.Suit && x.Rank > HighCard.Rank).ToList();
// Play lowest card over the high card if possible.
if (overCards.Any())
{
return(overCards.OrderBy(x => x.Rank).First());
}
}
var s1 = PlayHighestKnown(LeadCard.Suit);
if (s1 != null && s1.Rank > HighCard.Rank)
{
if (PartnerCard == null || HighCard.Rank != PartnerCard.Rank)
{
return(s1);
}
}
}
if (BookCards.Count == 2) // Partner is winning and opposing team will play after you.
{
// Check if your partner has the highest possible card (excluding your hand cards).
var s2 = PlayHighestKnown(LeadCard.Suit);
if (s2 != null && PartnerCard != null && s2.Rank > PartnerCard.Rank)
{
var partnerIsHighestKnown = true;
for (var i = PartnerCard.Rank; i < s2.Rank; i++)
{
var higherCard = new Card(i, LeadCard.Suit);
if (!Logic.PlayedCards.Contains(higherCard) &&
!Logic.HandCards.Contains(higherCard))
{
partnerIsHighestKnown = false;
}
}
// If a higher card exists than your partners play, but is not accounted for, play highest known.
if (!partnerIsHighestKnown)
{
return(s2);
}
}
}
}
// Can't play higher, play lowest.
return(Logic.HandCards.Where(x => x.Suit == LeadCard.Suit).OrderBy(x => x.Rank).First());
}
private Card Play_PartnerNil_OnSuit()
{
// If partner has not yet played, play high.
if (PartnerCard == null)
{
return(Logic.HandCards
.Where(x => x.Suit == LeadCard.Suit)
.OrderByDescending(x => x.Rank)
.First());
}
// Partner has played, check if they are on suit.
if (PartnerCard.Suit != LeadCard.Suit && PartnerCard.Suit != "s")
{
// Partner is off suit and safe, take book if sure.
if (BookCards.All(x => x.Suit != "s"))
{
var s0 = PlayHighestKnown(LeadCard.Suit);
if (s0 != null && HighCard.Rank < s0.Rank)
{
return(s0);
}
}
}
if (Logic.HandCards.Any(x => x.Suit == LeadCard.Suit && x.Rank > PartnerCard.Rank))
{
return(Logic.HandCards
.Where(x => x.Suit == LeadCard.Suit &&
x.Rank > PartnerCard.Rank)
.OrderBy(x => x.Rank)
.First());
}
return(Logic.HandCards
.Where(x => x.Suit == LeadCard.Suit)
.OrderBy(x => x.Rank).First());
}