Dutching
Encyclopedia
In gambling
Gambling
Gambling is the wagering of money or something of material value on an event with an uncertain outcome with the primary intent of winning additional money and/or material goods...

, Dutching is sharing the risk of losing across a number or runners by backing more than one selection in a race or event. The process calculates the correct stake to place on each selection so that the return is the same if any of them wins. This is not to be confused with what constitutes a Dutch book
Dutch book
In gambling a Dutch book or lock is a set of odds and bets which guarantees a profit, regardless of the outcome of the gamble. It is associated with probabilities implied by the odds not being coherent....

 which is when a bookmaker
Bookmaker
A bookmaker, or bookie, is an organization or a person that takes bets on sporting and other events at agreed upon odds.- Range of events :...

 goes overbroke (the opposite to overround).

It is thought the strategy behind Dutching was originally conceived and employed by Arthur Flegenheimer (aka Dutch Schultz
Dutch Schultz
Dutch Schultz was a New York City-area Jewish American gangster of the 1920s and 1930s who made his fortune in organized crime-related activities such as bootlegging alcohol and the numbers racket...

) alongside various rackets he had running at the racetrack. The system has since taken his name.

The strategy can pay dividends when gamblers successfully reduce the potential winners of an event to a select few from the field or when information about runners not expected to perform well does not reach the market (so as to affect the odds
Odds
The odds in favor of an event or a proposition are expressed as the ratio of a pair of integers, which is the ratio of the probability that an event will happen to the probability that it will not happen...

) making backing the rest of the field profitable.

Dutching calculators that perform the mathematics behind the system are freely available on the internet.
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