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saddlers hall
18 Sep 18 11:30
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Date Joined: 13 Nov 07
| Topic/replies: 129 | Blogger: saddlers hall's blog
If there was a 3 horse race priced as follows : horse (a) 2.0
                                                                   horse (b)  3.65
                                                                   horse (c)  4.4

if horse (A) was withdrawn, what would the price on betfair be of horse (B) and (C) ?

Tks in advance.
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Report kevin7654 September 18, 2018 11:55 AM BST
It all depends on the reduction factor.

Each horse has a reduction factor ( in the graph area by horses name).

If horse A had a reduction factor of 51.5% then horse B will be 3.65 multiplied by 48.5% making it a 1.77 shot
Report onlooker September 18, 2018 12:11 PM BST
In a NEW Market - OR ... After the Betfair REDUCTION FACTOR? -

Which would probably be 2 different answers.

In a NEW Market ...

3.65 would become 8/11 FAV
4.4 would become  11/8

If the REDUCTION FACTOR was a True 50% - then - as it is applied to BOTH potential Winnings AND Stake  - would it not make both the 3.65 and 4.4 chances equal to 2.0 shots EACH.

Meaning ... ZERO Win OR Lose, whichever won.

circa £27 on the 3.65 - to Return circa £100  ... Less 50% = £50 = £50 Return

circa £23 on the 4.4 -  to Return circa £100  ... Less 50% = £50 = £50 Return

Total Stakes = £50  as above  ... Return = £50  - whichever wins.

Profit/Loss = Zero ... LESS COMMISSION  Happy
Report longbridge September 18, 2018 12:29 PM BST
@onlooker I don't follow your maths.

If the RF for horse A was 50% as expected,

then bets on horse B at horse B 3.65 would be RF'd down to 1.825 and bets on horse C at 4.4 would be RF'd down to 2.2 (so more like 6/5 and 5/6 than 11/8 and 8/11, though I avoid fractional odds like the plague)
Report brassneck September 18, 2018 1:47 PM BST
B=1.65 TO BACK
C=2.04 TO BACK
Report saddlers hall September 18, 2018 2:52 PM BST
I was wondering what would the prices be if a new market was established? tks.
Report Charlton2005 September 18, 2018 3:03 PM BST
1.82 ans 2.2 is the answer assuming you take the 50% prob removed and spread in in proportion between the other 2.
Report Charlton2005 September 18, 2018 3:05 PM BST
apologies i could have just said "longbridge has the correct answer" Grin
Report brassneck September 18, 2018 3:13 PM BST
COULD SOMEONE POST THE MAN WITH HIS HEAD IN HIS HANDS ,i am amazed how some guys end up on a gambling siteLaugh
Report longbridge September 18, 2018 3:52 PM BST
@brassneck.

I know what you mean.  How did you arrive at the prices you quoted?  They imply a 110% book when the market pre-the NR was a 100% one - doesn't feel likely to me.
Report freddiewilliams September 18, 2018 4:14 PM BST
Can someone answer this question please.....Have a free 2500£ bet. Any sport
But has to be rolled 8 times before withdrawal......best way t o play it?
Thanks
Report onlooker September 18, 2018 6:51 PM BST
longbridge    18 Sep 18 12:29 

@onlooker I don't follow your maths.
------------------

Well - At least I explained my figures - unlike the vast majority, on nearly all, threads on here.

Hard to see what wants outlining further than I posted - However I will break it down even more ...

As you have just posted to brassneck - 'the market pre-the NR was a 100% one'

Assuming that the Backer backs ALL 3 horses to RETURN £100 - whichever horse won  - then his Stakes outlay will ALSO TOTAL £100.

In this instance

£50 an A  @ 2.0  = Return £100

circa £27 on B the 3.65 chance = Return circa £100

circa £23 on C the 4.4 chance  = Return circa £100

circa rounded-up/down figures for convenience of example.

Therefore = ZERO Profit or Loss - whichever horse wins in this 100% book (as per a Betfair Pre-Race Market)

Horse A - the 2.0 chance - becomes a NON-Runner ... meaning £50 Stake Returned to Backer

Backer's TOTAL Stake outlay NOW =  £50

Backer's RETURNS now subject to 50% REDUCTION FACTOR - Winnings AND STAKE.

Thus ...

circa £27 on B the 3.65 chance = ORIGINAL Return circa £100 ..

[b[now becomes[/b] ... circa £27 on the 3.65 - to Return circa £100  ... Less 50% = £50 - NOW = £50 Return

circa £23 on C the 4.4 chance  = ORIGINAL Return circa £100 ...

now becomes ... circa £23 on the 4.4 -  to Return circa £100  ... Less 50% = £50 - NOW = £50 Return

Total Stakes [b]now becomes £50 ... (The £50 on the NON-Runner, horse A, having been RETURNED to the Backer)

Total Stakes = £50  as above  ... Return = £50  - whichever wins.

Profit/Loss = Zero ... LESS COMMISSION

  * as I posted at 12:11 ... Hard to envisage how it can be put any clearer - in fact, it cannot.
Report longbridge September 19, 2018 11:52 AM BST
@onlooker

£27 on NB to return £50 is odds of 1.85.  Yet you say it would become the 8/11 Fav.  8/11 is 1.72

So the bet I'm not clear on is how you get from "a £27 bet to return £50" to "8/11".
Report longbridge September 19, 2018 11:53 AM BST
£27 on Horse B*
Report onlooker September 19, 2018 1:03 PM BST
sorry for the misconception/confusion - longbridge.

My detailed  breakdown of the REDUCTION FACTOR application to the Market, is SEPARATE from my guesstimation of what the Prices would be if it were an entirely DIFFERENT/SEPARATE Market - NOT a Reduction Factor applied Market - priced up between just the other 2 horses.

I marginally misinterpreted the OP opening post as if he meant just a straight 2-horse race - Horse A NEVER having been part of that equation... and NOT 8/11 representing the Reduction Factor applied price - that never being my intention.
Report longbridge September 19, 2018 2:03 PM BST
Thanks onlooker, all makes sense now.
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