Match Play at 2-away/2-away

 Counterexample?

 From: Jim Williams Address: jimw@giga-net.com Date: 3 March 1998 Subject: Re: Doubling at 2 away/ 2 away Forum: rec.games.backgammon Google: 34FC4F23.3375@giga-net.com

```> The below is an extract from Kit Woolsey's special report "How to Play
> Tournament Backgammon".  If you want a copy, you can contact Kit on
> FIBS.
>
> "THE TWO-AWAY VERSUS TWO-AWAY SCORE"
> ...
> Consequently, at two-away versus two-away you should always double if
> there is any chance that after the next exchange you will lose your
> market (i.e. your opponent will no longer have a take).

This does not seem to always be the case.  Consider the following
contrived example.  Half your rolls lose the game outright, and half
leave you with an 80% chance of winning the game (clearly a market
loser).

No gammons for this example.  If you double, you will win 40% of the
matches.

If you don't double, then 50% probability you lose one point (opponent
either wins or doubles you out) and 50% probability you win one point
(you double out opponent on next turn).  So not doubling leaves you with
50% match equity, which is clearly better.

- Jim
```

 Kit Woolsey  writes: ```This would be correct if you ever reached such a position. But how can you get there? If 50% of your rolls now lose outright your opponent must have had many market losing sequences before his previous roll, so he clearly should have doubled. With correct play on both sides, you just can't get from the starting position to the end of the game without the cube being turned and accepted at this match score. Kit ```

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### Match Play at 2-away/2-away

Basic strategy  (Darse Billings, Feb 1995)
Counterexample?  (Jim Williams+, Mar 1998)
Do you need an advantage to cube?  (Keene Marin+, Feb 2006)
Double immediately?  (Chuck Bower, Oct 1998)
Ever too good to double?  (Kit Woolsey, July 1995)
Minimum game winning chances to double  (Walter Trice, Mar 1999)
Practical strategy  (Walter Trice, July 1995)
Practical strategy  (Albert Steg+, Feb 1995)
Proof for doubling immediately  (Robert Koca+, May 1994)
Proof of doubling with market losers  (Walter Trice+, July 2001)
Sample game  (Ron Karr, Dec 1996)

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