diff --git a/Makefile b/Makefile
index 957a714..4d60f33 100644
--- a/Makefile
+++ b/Makefile
@@ -5,13 +5,13 @@ default: run
 run: simgame
 
 simgame: examples
-	./bin/simgame
+	RANDOM_SHUFFLE=1 ./bin/simgame
 
 clean:
 	rm -rf bin *.test
 
 test:
-	go test -v -count=1 ./...
+	go test -count=1 .
 
 examples:
 	test -d bin || mkdir bin
diff --git a/examples/simgame/main.go b/examples/simgame/main.go
index ee6b3d9..daea2d3 100644
--- a/examples/simgame/main.go
+++ b/examples/simgame/main.go
@@ -2,6 +2,7 @@ package main
 
 import (
 	"fmt"
+	"os"
 	"time"
 
 	"git.eeqj.de/sneak/pokercore"
@@ -12,10 +13,9 @@ var delayTime = 2 * time.Second
 var playerCount = 8
 
 type Player struct {
-	Hand                    pokercore.Cards
-	ScoredHand              *pokercore.PokerHand
-	Position                int
-	CommunityCardsAvailable pokercore.Cards
+	Hand       pokercore.Cards
+	ScoredHand *pokercore.PokerHand
+	Position   int
 }
 
 type Game struct {
@@ -25,15 +25,38 @@ type Game struct {
 	Street    int
 }
 
-func NewGame(seed int) *Game {
+func suspense() {
+	fmt.Printf("########################################\n")
+	if os.Getenv("NO_LAG") == "" {
+		time.Sleep(delayTime)
+	}
+}
+
+func NewGame() *Game {
+
+	// this "randomly chosen" seed somehow deals pocket queens, pocket kings, and pocket aces to three players.
+	// what are the odds? lol
+	//g := NewGame(1337))
+
+	// nothing up my sleeve:
+	seed := 3141592653
+
 	g := &Game{}
 	g.Street = 0
+
 	g.Deck = pokercore.NewDeck()
 	g.SpreadCards()
+
 	fmt.Printf("Shuffle up and deal!\n")
-	time.Sleep(delayTime)
+	suspense()
 	fmt.Printf("Shuffling...\n")
-	g.Deck.ShuffleDeterministically(3141592653)
+
+	if os.Getenv("RANDOM_SHUFFLE") != "" {
+		g.Deck.ShuffleRandomly()
+	} else {
+		fmt.Printf("Using deterministic shuffle seed: %d\n", seed)
+		g.Deck.ShuffleDeterministically(int64(seed))
+	}
 	return g
 }
 
@@ -121,32 +144,25 @@ func (g *Game) ShowWinner() {
 }
 
 func main() {
-
-	// this "randomly chosen" seed somehow deals pocket queens, pocket kings, and pocket aces to three players.
-	// what are the odds? lol
-	//g := NewGame(1337))
-
-	// nothing up my sleeve:
-	g := NewGame(3141592653)
+	g := NewGame()
 
 	g.ShowGameStatus()
-
 	g.DealPlayersIn()
+	suspense()
 
 	g.ShowGameStatus()
-
 	g.DealFlop()
+	suspense()
 
 	g.ShowGameStatus()
-
 	g.DealTurn()
+	suspense()
 
 	g.ShowGameStatus()
-
 	g.DealRiver()
+	suspense()
 
 	g.ShowGameStatus()
-
 	g.ShowWinner()
 
 	fmt.Printf("What a strange game.  The only winning move is to bet really big.\n")
diff --git a/perf_test.go b/perf_test.go
index 2847e8d..7f3b1c8 100644
--- a/perf_test.go
+++ b/perf_test.go
@@ -56,8 +56,13 @@ func measureHandFinding(t *testing.T, iterations int, cardCount int) {
 	if err != nil {
 		t.Fatalf("Error measuring function: %v", err)
 	}
+	t.Logf("Searching %d random cards for a hand takes on average %s", cardCount, result.Mean)
+	t.Logf("Over %d iterations the min was %s and the max was %s", iterations, result.Min, result.Max)
+	t.Logf("The standard deviation was %s", result.StdDev)
+	t.Logf("The median was %s", result.Median)
+
 	// Print the timing results.
-	t.Logf(result.String())
+	//t.Logf(result.String())
 }
 
 func findHandInRandomCards(t *testing.T, shuffleSeed int, cardCount int) {
diff --git a/scoring_test.go b/scoring_test.go
index 957df24..f7ca952 100644
--- a/scoring_test.go
+++ b/scoring_test.go
@@ -83,12 +83,13 @@ func TestAceLowStraight(t *testing.T) {
 	assert.Equal(t, ph.Score, ScoreStraight+FIVE.Score())
 	assert.Equal(t, ph.Description(), "a five high straight")
 	assert.True(t, hand.HighestRank() == ACE, "Expected highest rank to be an ace")
-	assert.True(t, hand.SortByRankAscending().First().Rank == DEUCE, "Expected first card to be a deuce")
-	assert.True(t, hand.SortByRankAscending().Last().Rank == ACE, "Expected last card in sorted to be a ace")
-	assert.True(t, hand.SortByRankAscending().Second().Rank == THREE, "Expected second card to be a three")
-	assert.True(t, hand.SortByRankAscending().Third().Rank == FOUR, "Expected third card to be a four")
-	assert.True(t, hand.SortByRankAscending().Fourth().Rank == FIVE, "Expected fourth card to be a five")
-	assert.True(t, hand.SortByRankAscending().Fifth().Rank == ACE, "Expected fifth card to be an ace")
+	s := hand.SortByRankAscending()
+	assert.True(t, s.First().Rank == DEUCE, "Expected first card to be a deuce")
+	assert.True(t, s.Last().Rank == ACE, "Expected last card in sorted to be a ace")
+	assert.True(t, s.Second().Rank == THREE, "Expected second card to be a three")
+	assert.True(t, s.Third().Rank == FOUR, "Expected third card to be a four")
+	assert.True(t, s.Fourth().Rank == FIVE, "Expected fourth card to be a five")
+	assert.True(t, s.Fifth().Rank == ACE, "Expected fifth card to be an ace")
 }
 
 func TestAceHighStraight(t *testing.T) {
@@ -197,6 +198,35 @@ func TestStraightFlush(t *testing.T) {
 	assert.True(t, shuffledHand.HighestRank() == SIX, "Expected highest rank to be a six after shuffle even with aces low")
 }
 
+func TestFourOfAKind(t *testing.T) {
+	hand := Cards{
+		SixOfSpades(),
+		SixOfHearts(),
+		SixOfDiamonds(),
+		SixOfClubs(),
+		FiveOfSpades(),
+	}
+	assert.False(t, hand.containsStraight(), "Expected hand to not be a straight")
+	assert.False(t, hand.containsFlush(), "Expected hand to not be a flush")
+	assert.False(t, hand.containsStraightFlush(), "Expected hand to not be a straight flush")
+	assert.False(t, hand.containsRoyalFlush(), "Expected hand to not be a royal flush")
+	assert.True(t, hand.containsFourOfAKind(), "Expected hand to be four of a kind")
+	assert.False(t, hand.containsFullHouse(), "Expected hand to not be a full house")
+
+	// note that these are *expected* to be true.  the contains* functions
+	// are used in the PokerHand.calculateScore method to determine the best hand
+	// and are checked in sequence of descending value, so if a hand is four of a kind
+	// it will not be checked for full house, three of a kind, etc.
+
+	// technically quads *is* two pair also, and a hand with quads does
+	// indeed contain three of a kind, and contains a pair.
+	assert.True(t, hand.containsThreeOfAKind(), "Expected hand to contain three of a kind")
+	assert.True(t, hand.containsTwoPair(), "Expected hand to contain two pair")
+	assert.True(t, hand.containsPair(), "Expected hand to contain a pair")
+
+	assert.True(t, hand.HighestRank() == SIX, "Expected highest rank to be a six")
+}
+
 func TestRoyalFlush(t *testing.T) {
 	hand := Cards{
 		TenOfSpades(),
@@ -262,6 +292,17 @@ func TestTwoPair(t *testing.T) {
 	assert.False(t, hand.isUnmadeHand(), "Expected hand to not be unmade")
 }
 
+func TestDetectDuplicates(t *testing.T) {
+	hand := Cards{
+		KingOfSpades(),
+		JackOfDiamonds(),
+		JackOfSpades(),
+		KingOfSpades(),
+		TenOfSpades(),
+	}
+	assert.True(t, hand.containsDuplicates(), "Expected hand to contain duplicates")
+}
+
 func TestHandScore(t *testing.T) {
 	hand := Cards{
 		KingOfSpades(),