Keying a trifecta may sound like advanced horse racing betting to newer handicappers, but it is not an overly complicated wager in practice.

In its simplest form, the trifecta key bet allows the bettor to select a “key” horse to finish a race in first place and two or more additional horses to take second and third place in any order.

The trifecta key bet is an excellent choice for bettors who find the straight trifecta too inconsistent and the box variation too expensive.

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How Trifecta Key Bets Work

Some of the confusion surrounding trifecta key bets is due to the variety of ways in which the wager can be organized. In reality, the trifecta key is not as complicated as it sounds.

First, it helps to understand how the trifecta box bet works. In a trifecta box, the bettor chooses three or more horses and wins if those horses take first, second, and third place in any order.

For example, a bettor can place a trifecta box bet on four horses and win if any three of those selections finish the race in first, second, and third place in any order. Because this bet involves four horses that can finish in any order, it covers 24 possible outcomes. Therefore, the trifecta box is a relatively expensive bet (a $1 trifecta box with four horses would cost $24).

One of the problems with the basic trifecta box bet is that it gives equal weighting to all of the selections. If the bettor has a stronger feeling about one or more horses, placing a standard trifecta box bet is unnecessarily expensive.

Trifecta keys work on a similar principle but involve a bit more specificity to keep the wager’s cost down.

A basic trifecta key involves selecting a key horse to finish the race in first place. The bettor can add two or more other horses to cover second and third place in any order. The wager wins if the keyed horse finishes first and the other selections finish in second and third place in any order.

There are other ways to manage trifecta keys, including keying multiple horses. But to begin, consider the following example for a simple overview of how trifecta keys work.

Basic Trifecta Key Example

Imagine a race in which the bettor believes Horse #4 is the strongest runner and that horses 5, 6, and 7 are quality contenders.

The bettor in this situation could place a $1 trifecta box on 4, 5, 6, and 7, but it would cost $24 to do so and give equal weighting to all four selections. Alternatively, the bettor could place a $1 trifecta key, #4 over 5/6/7 for just $6, and give preference to Horse #4.

This basic trifecta key would win in all scenarios in which Horse #4 finishes first AND any combination of 5, 6, and 7 take second and third place in any order.

There are fewer winning combinations with the trifecta key, but the bettor has chosen the most optimal combinations based on his analysis and has saved money without sacrificing a potentially massive payout.

How to Place a Trifecta Key Bet Online

Placing a trifecta key horse racing bet is mostly a matter of understanding how the bet works. Once you’re comfortable with the concept and encounter a situation that calls for the trifecta key, you’ll find that most online racebooks do an admirable job making it intuitive to place the wager.

First, open the race you intend to bet on to view the program. Next, use the wagering menu to change the bet type to “trifecta” and the modifier to “key.” Your screen may look different depending on where you bet on horse races, but you should see something similar to this:

trifecta key bet example 1

Now, click or tap the horse you like the most under the “key” column, and select any other horses you want to add to the wager under the “with” column:

trifecta key bet example 2

Once you’re satisfied with the wager, hit the “submit” button to place your bet.

Basic Trifecta Key Cost Calculator

Trifecta keys provide significant savings compared to boxed bets, but the costs can still add up as the bettor adds more horses to their ticket.

Below, bettors can see at a glance how much a standard $1 trifecta key will cost based on the number of selections. The following prices are for simple trifecta keys similar to those described above, with one keyed horse and a varying number of additional selections.

The final price of each trifecta key represents the number of possible winning combinations. As the bettor adds more horses, the price of the trifecta increases to account for the range of possible winning outcomes. For example, a $1 trifecta key with one horse over three will cost $6 and covers six winning outcomes.

  • $1 trifecta key with 1 over three other horses: $6
  • $1 trifecta key with 1 over four other horses: $12
  • $1 trifecta key with 1 over five other horses: $20
  • $1 trifecta key with 1 over six other horses: $30
  • $1 trifecta key with 1 over seven other horses: $42
  • $1 trifecta key with 1 over eight other horses: $56

An easy way to calculate the cost of a basic trifecta key is to multiply the number of additional horses times itself minus one, then multiply that by the base wager amount.

For example, a $1 trifecta key with 1 horse over three other horses (3x2x$1) is $6. Likewise, a $2 trifecta key with one horse over three others (3x2x$2) is $12.

Trifecta Key Wheels And Part-Wheels

Where trifecta key betting begins to look more complicated is when we move into discussing full wheels and part-wheels. However, a careful reading of this section will show it’s not as complicated as it looks at first glance.

Trifecta Key Full Wheel

To begin, a full trifecta wheel is simply the term to describe keying one horse over all the other runners in a race. This is exactly the same type of bet as described above – it just keys one horse over the field.

For example, a trifecta key full wheel in an eight-horse race would key one horse over the other seven as in this example:

$1 trifecta, #4 over 1, 2, 3, 5, 6, 7, 8

This bet costs $42 and will win if #4 finishes in first place no matter what happens with the other horses in the race.

Trifecta Key Part-Wheel

A trifecta part-wheel provides more flexibility to the bettor. For example, consider a situation in which the bettor really likes Horse #4 and somewhat likes horses 5, 6, 7, and 8.

Additionally, imagine the bettor doesn’t want to limit his wager to #4 winning. Instead, he wants his trifecta key to win if #4 finishes in first OR second, and if the other selections fill in for first/second and third place in any order.

In this case, the bettor can place two trifecta keys:

1st key: $1 trifecta, #4 over 5-6-7-8 (wins if #4 finishes first and 5, 6, 7, and 8 account for second and third place in any order)

2nd key: $1 trifecta, 5-6-7-8 with #4 with 5-6-7-8 (wins if #4 finishes second, and 5, 6, 7, and 8 account for first and third place in any order)

Note the structure of the second trifecta key bet. The various types of trifecta keys express their intentions for first, second, and third place in that order. As the second key above states, it intends to cover horses 5/6/7/8 for first place, reserve #4 for second place, and cover horses 5/6/7/8 for third place.

In this case, the bettor combined two trifecta keys to get his desired result: A bet that wins if #4 takes first or second place, and horses 5/6/7/8 fill in the other top spots.

Bettors can play with trifecta keys to put as many horses as they wish in each finishing position. For example, a bettor could place a trifecta that covers one horse for first place, two horses for second place, and three horses for third place:

$1 trifecta part-wheel 1 with 2/3 with 4/5/6

This bet would win if Horse #1 takes first place, Horse #2 or #3 takes second place, and Horse #4, #5, or #6 takes third place.

Trifecta Key Box Bet Explained

A trifecta key box is a variant of the trifecta key that covers more combinations.

To review, a trifecta key slots a “key” horse into the first place position over the other horses to fill in the remaining positions in any order. For example, keying 1 over 4, 5, 7 creates a wager that wins only if 1 finishes in first place while any two of 4, 5, and 7 take second and third place in any order. A $1 trifecta key 1/4,5,7 would cover six winning outcomes and cost $6:

  • 1-4-5
  • 1-4-7
  • 1-5-4
  • 1-5-7
  • 1-7-5
  • 1-7-4

A trifecta key box of 1 over 4, 5, 7 differs from the above because it wins if the keyed horse finishes in any position and any of the other selections take the other positions in any order. Continuing the example, a trifecta key box of 1 over 4, 5, 7 wins if 1 finishes in any position and any two of 4, 5, 7 fill in the remaining positions in any order. A $1 trifecta key box 1/4,5,7 covers 18 combinations and costs $18:

  • 1-4-5
  • 1-4-7
  • 1-5-4
  • 1-5-7
  • 1-7-5
  • 1-7-4
  • 4-1-7
  • 4-1-5
  • 5-1-7
  • 5-1-4
  • 7-1-4
  • 7-1-5
  • 4-5-1
  • 4-7-1
  • 5-4-1
  • 5-7-1
  • 7-4-1
  • 7-5-1

The trifecta key box functions a lot like a regular trifecta box wager, but it eliminates some of the extra winning combinations to reduce the cost of the wager. While the above wager costs $18, a trifecta box on horses 1, 4, 5, 7 would cost $24 because it would cover all of the above combinations plus the combinations that don’t include Horse 1.

Trifecta Key Advantages And Uses

A trifecta key wager offers several advantages to bettors. First, it maintains the high-paying potential of the straight trifecta. A keyed trifecta that wins pays the same as any other winning trifecta.

Simultaneously, the trifecta key allows bettors to select multiple horses and cover every likely combination without incurring the large upfront costs emblematic of the trifecta box bet.

Keying a trifecta helps keep the costs down relative to a trifecta box by eliminating some of the less-likely combinations. By selecting a key horse to finish first and eliminating outcomes in which other horses finish first, the trifecta key covers fewer combinations and therefore costs significantly less than a box bet that covers more possible outcomes.

There is a downside to covering fewer combinations, but the cost savings is usually worth it if the bettor can identify less-likely outcomes that offer little value. In these ways, the trifecta key provides the best of both worlds: it preserves the large payouts of the straight trifecta without incurring the high costs of the trifecta box.

Trifecta Key Bets FAQ

A trifecta key bet allows a bettor to select a favorable “key” horse to finish in first place and any number of other horses to finish in second and third place in any order.

Imagine a bettor thinks Horse 1 is the overwhelming favorite in an upcoming race. Now, imagine the bettor also thinks Horses 2, 3, and 4 are solid runners but isn’t as sure how well they will fare against each other for the second and third place finishes. In that case, the bettor can key Horse 1 over Horses 2, 3, 4 to create a bet that wins if Horse 1 takes first place and any two of the others take second and third place in any order.

A trifecta box covers every possible combination of three or more horses to finish in first, second, and third place, while a trifecta key designates one horse as the “key” and additional horses to fill in the remaining places in any order. As a result, a trifecta key is cheaper than a box because it covers fewer winning combinations.

A straight trifecta involves three selections that must win in the exact order specified by the bettor. In comparison, a trifecta key designates one horse to finish in first place and two or more others to finish in second and third in any order.

Bettors can include as many horses as they want in a trifecta key. For instance, a trifecta wheel selects one key horse over the rest of the field.

Yes. Greyhound racetracks usually accept trifectas and trifecta keys.