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Reko

Betting glossary

Every term Reko uses, in plain words, with the calculator or guide that puts it to work.

A
Accumulator
BET TYPES
One bet across several selections where every leg has to win. The prices multiply, so four legs at 2.00 pay 16.00. Known as a parlay in the US.
American odds
ODDS
Prices written as +150 or −200. A positive number is the profit on a 100 stake; a negative number is the stake needed to win 100.
Ante-post
RACING
A bet placed well before the event, usually before the final field is known. Prices are bigger because your selection might not run.
Arbitrage
VALUE
Backing every outcome at prices that guarantee a profit whichever one lands. Happens when two books disagree enough to push the book under 100%.
B
Bankroll
STAKING
The money set aside for betting, separate from everything else. Stake sizes are a percentage of it, so the bankroll is what limits your risk.
Book percentage
ODDS
Add up the implied chance of every outcome. Over 100% is the bookmaker margin; under 100% is an arb.
C
Closing line
VALUE
The last price available before an event starts. It is the market's best estimate, which is why it is the benchmark worth measuring against.
CLV
VALUE
Closing line value. The gap between your price and the closing price, as a percentage. Positive CLV over a real sample is evidence of an edge.
Commission
EXCHANGE
The cut an exchange takes from your winnings, typically 2%. It applies to net profit on a market, not to the stake.
D
Dead heat
RACING
Two or more selections tie for a place. Stakes are divided by the number tied and settled at full odds on the reduced stake.
Decimal odds
ODDS
Prices written as 2.75, meaning the total return per unit staked including the stake. The default in Europe and on exchanges.
Drawdown
STAKING
The distance from your highest bankroll to its lowest point after it. The number that decides whether a staking plan is survivable.
Dutching
STAKING
Splitting one stake across several selections so the return is the same whichever wins.
E
Each-way
BET TYPES
Two bets of the same size, one on the win and one on the place. The place half pays a fraction of the win price.
Edge
VALUE
How much better your estimate of the chance is than the price implies. A 2.50 shot you rate at 45% carries a 12.5% edge.
Exchange
EXCHANGE
A market where bettors take both sides against each other and the operator charges commission instead of building a margin into the price.
Expected value
VALUE
The average result per bet if you could repeat it forever. Positive expected value is the whole job; the rest is variance.
F
Fold
BET TYPES
The number of legs in a multiple. A four-fold is four selections that all have to win.
Fractional odds
ODDS
Prices written as 7/4, meaning the profit against the stake. Still standard in UK racing.
Free bet
BET TYPES
A stake-not-returned bet from a bookmaker. Only the profit is paid, so it is worth less than the same amount in cash.
H
Hedge
EXCHANGE
Taking the other side of a bet you already hold to reduce or remove the risk, usually at the cost of some expected value.
I
Implied probability
ODDS
The chance a price assumes. One divided by the decimal price, so 2.75 implies 36.4%.
K
Kelly criterion
STAKING
A staking formula that sizes each bet in proportion to the edge. Most people use half or quarter Kelly to cut the swings.
L
Lay
EXCHANGE
Betting that something will not happen. Your risk is the liability rather than the stake.
Liability
EXCHANGE
What a lay bet can lose: the lay stake multiplied by the price minus one. $50 at 3.20 risks $110.
Limited account
RECORDS
A bookmaker capping your stakes rather than closing you. Usually follows consistent CLV rather than consistent profit.
M
Matched betting
EXCHANGE
Backing at a bookmaker and laying the same outcome on an exchange so the result does not matter, to convert a bonus into cash.
N
Non-runner
RACING
A selection that does not take part. Win bets are voided; ante-post bets usually are not.
O
Overround
ODDS
The margin built into a market, the amount by which the book exceeds 100%. A 105% book keeps roughly 4.8% of turnover.
P
Parlay
BET TYPES
The US term for an accumulator. Every leg must win and the prices multiply.
Place terms
RACING
The fraction of the win price paid on the place part of an each-way bet, and how many places count. Commonly a fifth, one to four places.
Push
BET TYPES
A bet that settles as a tie, usually on a handicap or line landing exactly. The stake is returned.
R
ROI
RECORDS
Return on investment. Profit divided by total staked, which is the fair way to compare a $5 bettor with a $500 one.
Round robin
BET TYPES
Every combination of a group of selections at a chosen size, so three picks in doubles is three bets.
Rule 4
RACING
A deduction from winnings when a horse is withdrawn after you bet, scaled to the price of the one that came out.
S
Sharp
VALUE
A bookmaker or bettor whose prices carry real information. Sharp books move slowly and their closing prices are the ones to measure against.
SP
RACING
Starting price. The official price a race is returned at when the market closes, so it doubles as the closing line for racing bets.
Staking plan
STAKING
The rule that decides how much goes on each bet: level, a percentage of bankroll, or fractional Kelly.
Steam
VALUE
A fast, coordinated price move across several books, usually money following information. Chasing steam late is how you end up on the wrong side of the close.
Strike rate
RECORDS
The share of your bets that win. Meaningless without the average price attached, since 30% at 5.00 beats 60% at 1.50.
V
Variance
STAKING
The spread of results around your expectation. High variance is why a real edge can lose for months.
Void
BET TYPES
A bet that stands at odds of 1.00 because the event did not happen as priced. Stake back, and in a multiple the leg drops out.
Y
Yankee
BET TYPES
Eleven bets across four selections: six doubles, four trebles and a fourfold. Two winners already return something.

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