private bool IsOpenEndedStraightDraw(CardList cardList)
{
if (cardList.Count < 4) return false;
// Except if the ace is the last card, because there's no cards higher than the ace
if (cardList.AreConsecutive(true, false, 4)){
// (list is sorted from lowest to highest)
cardList.Sort(SortUsing.AceHigh);
// Special case
if (cardList[cardList.Count - 1].Face == CardFace.Ace &&
cardList[cardList.Count - 2].Face == CardFace.King &&
cardList[cardList.Count - 3].Face == CardFace.Queen &&
cardList[cardList.Count - 4].Face == CardFace.Jack) return false;
else return true;
}
// Except if the ace is not the first card, there's no cards lower than the ace
if (cardList.AreConsecutive(false, false, 4))
{
cardList.Sort(SortUsing.AceLow);
// Special case
if (cardList[0].Face == CardFace.Ace &&
cardList[1].Face == CardFace.Two &&
cardList[2].Face == CardFace.Three &&
cardList[3].Face == CardFace.Four) return false;
else return true;
}
return false;
}
private PairType GetPairType(CardList communityCards, Card matching, Card firstCard, Card secondCard)
{
communityCards.Sort(SortUsing.AceHigh);
// Pocket pair
if (firstCard.Face == secondCard.Face)
{
if (firstCard.GetFaceValue() >= communityCards.Last.GetFaceValue()) return PairType.Top;
else if (firstCard.GetFaceValue() <= communityCards[0].GetFaceValue()) return PairType.Bottom;
else return PairType.Middle;
}
else
{
// Matched the board
if (matching.Face == communityCards.Last.Face) return PairType.Top;
else if (matching.Face == communityCards[0].Face) return PairType.Bottom;
else return PairType.Middle;
}
}
private bool IsInsideStraightDraw(CardList cardList, bool countAceAsHigh)
{
if (cardList.Count < 4) return false;
cardList.Sort(countAceAsHigh);
// Case 1 and 2 are special cases
// Case 1: first card is an ace and we are not counting ace as low, followed by 2, 3, 4
if (!countAceAsHigh &&
cardList[0].Face == CardFace.Ace &&
cardList[1].Face == CardFace.Two &&
cardList[2].Face == CardFace.Three &&
cardList[3].Face == CardFace.Four) return true;
// Case 2: first card is a J and we are counting ace as high, followed by Q, K, A
if (countAceAsHigh &&
cardList[0].Face == CardFace.Jack &&
cardList[1].Face == CardFace.Queen &&
cardList[2].Face == CardFace.King &&
cardList[3].Face == CardFace.Ace) return true;
// Case 2: 1 card, missing, 3 straight
for (int i = 0; i < (cardList.Count - 3); i++)
{
int faceValue = cardList[i].GetFaceValue(countAceAsHigh);
if (cardList[i + 1].GetFaceValue(countAceAsHigh) == faceValue + 2 &&
cardList[i + 2].GetFaceValue(countAceAsHigh) == faceValue + 3 &&
cardList[i + 3].GetFaceValue(countAceAsHigh) == faceValue + 4)
{
return true;
}
}
// Case 3: 2 straight, missing, 2 straight
for (int i = 1; i < (cardList.Count - 2); i++)
{
int faceValue = cardList[i].GetFaceValue(countAceAsHigh);
if (cardList[i - 1].GetFaceValue(countAceAsHigh) == faceValue - 1 &&
cardList[i + 1].GetFaceValue(countAceAsHigh) == faceValue + 2 &&
cardList[i + 2].GetFaceValue(countAceAsHigh) == faceValue + 3)
{
return true;
}
}
// Case 4: 3 straight, missing, 1 card
for (int i = 2; i < (cardList.Count - 1); i++)
{
int faceValue = cardList[i].GetFaceValue(countAceAsHigh);
if (cardList[i - 2].GetFaceValue(countAceAsHigh) == faceValue - 2 &&
cardList[i - 1].GetFaceValue(countAceAsHigh) == faceValue - 1 &&
cardList[i + 1].GetFaceValue(countAceAsHigh) == faceValue + 2)
{
return true;
}
}
return false;
}
public ClassificationPostflop(HoldemHand hand, HoldemGamePhase phase, HoldemBoard board)
{
CardList communityCards = board.GetBoardAt(phase);
// Default
this.hand = HandType.Unknown;
this.kicker = KickerType.Unknown;
this.pair = PairType.Irrelevant;
this.draw = DrawType.Irrelevant;
this.straightDraw = StraightDrawType.None;
Trace.Assert(communityCards.Count > 0, "Cannot classificate an empty list of community cards.");
// Create a new list including the board cards and the cards from the hand
CardList cards = new CardList(communityCards.Count + 2);
foreach (Card c in communityCards) cards.AddCard(c);
cards.AddCard(hand.GetFirstCard());
cards.AddCard(hand.GetSecondCard());
// --- Royal flush
if (IsRoyalFlush(cards))
{
this.hand = HandType.RoyalFlush;
this.kicker = KickerType.Irrelevant;
return;
}
// -- Four of a kind
if (cards.HaveIdenticalFaces(4))
{
this.hand = HandType.FourOfAKind;
this.kicker = KickerType.Irrelevant;
return;
}
// -- Full House
// If we have three of a kind and two pair at the same time, we have a full house
bool isThreeOfAKind = cards.HaveIdenticalFaces(3);
bool isTwoPair = IsTwoPair(cards);
if (isThreeOfAKind && isTwoPair)
{
this.hand = HandType.FullHouse;
this.kicker = KickerType.Irrelevant;
return;
}
// -- Flush
for (int i = 0; i < cards.Count; i++)
{
int numCardsSameSuit = 0;
for (int j = i + 1; j < cards.Count; j++)
{
if (cards[i].Suit == cards[j].Suit)
{
numCardsSameSuit++;
}
}
if (numCardsSameSuit >= 4)
{
this.hand = HandType.Flush;
this.kicker = KickerType.Irrelevant;
return;
}
}
// -- Straight
if (IsStraight(cards))
{
this.hand = HandType.Straight;
this.kicker = KickerType.Irrelevant;
return;
}
// Calculate draws (if we got until here, there might be some)
// Also, no draws are possible at the river
if (phase == HoldemGamePhase.River)
{
draw = DrawType.None;
straightDraw = StraightDrawType.None;
}
else
{
draw = GetDrawType(cards);
if (IsInsideStraightDraw(cards))
{
straightDraw = StraightDrawType.InsideStraightDraw;
}
if (IsOpenEndedStraightDraw(cards))
{
straightDraw = StraightDrawType.OpenEndedStraightDraw;
}
}
// -- Trips
if (isThreeOfAKind)
{
this.hand = HandType.ThreeOfAKind;
this.kicker = KickerType.Irrelevant;
return;
}
// -- Two pair
if (isTwoPair)
{
this.hand = HandType.TwoPair;
this.kicker = KickerType.Irrelevant;
return;
}
// -- Pair
Card matching;
if (cards.HaveIdenticalFaces(2, out matching))
{
// Sort list by face value (ace high first)
cards.Sort(SortUsing.AceHigh);
// Find kicker (check from end of the list where face values are higher)
Card kicker = cards[0];
for (int i = cards.Count - 1; i >= 0; i--)
{
if (cards[i].Face != matching.Face)
{
kicker = cards[i];
break;
}
}
this.hand = HandType.Pair;
this.kicker = GetKickerTypeFromCard(kicker);
this.pair = GetPairType(communityCards, matching, hand.GetFirstCard(), hand.GetSecondCard());
return;
}
// -- High card
cards.Sort(SortUsing.AceHigh);
Card highCard = cards.Last;
this.hand = HandType.HighCard;
this.kicker = GetKickerTypeFromCard(highCard);
}