Forum Archive :
Rules
> Could somebody explain what the Jacoby rule is?
The Jacoby rule, invented by Oswald Jacoby, says:
In money play, the game winner receives no extra credit for gammons or
backgammons unless the cube has been doubled at least once.
The Jacoby rule is standard for money play almost everywhere, although
it's still a good idea to establish that you're using the rule when
you start a money play session.
The sole purpose of the rule is to speed up the game -- add a little
more excitement -- finish this game and move on to the next. The
Jacoby rule is never used in match play. The rule avoids those long
games where, having missed the market by a mile, one might play on
with little chance for either a gammon or a loss, or where, in match
play with a centered cube, a position is too good to double.
The Jacoby rule has some influence on both checker play and cube
decisions, mostly on checker play.
It encourages more aggressive checker play to achieve a gammonish
doubling position. The idea (simply put) is that if the strategy
works, you double and win four points; if it fails, you pass and lose
one, since unless the cube is turned you can't lose a gammon.
The rule's affect on cube decisions is harder to pin down. It seems
sensible that there will be positions which are not good enough to
double in a match but may be money doubles, if much of the doubler's
equity comes from gammons won, even if the doubler's overall winning
chances aren't terrific. In actual money play the rule probably
encourages typical players to double -- not just earlier -- but too
early, for fear of missing out on four points by not "activating
gammons." But against opponents who are known to be afraid to take a
double in a gammonish position, or to redouble if the game turns
around, the "early" double can still be a money winner.
_______________________________________________
Daniel Murphy http://www.cityraccoon.com
backgammon on-line: http://www.fibs.com
in San Francisco: http://www.backgammon.org
in Denmark: http://www.cityraccoon.com/hbk.html
|
|
|
|
Rules
- Bearing off question (Colin Wiel+, July 2000)
- Can a beaver be dropped? (Robert-Jan Veldhuizen+, Mar 2006)
- Can a beaver be dropped? (Stein Kulseth, May 2000)
- Changing dice (Julian Hayward, Feb 1998)
- Checker shuffling (James Johnson+, June 2000)
- Gentleman's previlege (Daniel+, Sept 2005)
- Hit and run (Rich+, Jan 2000)
- "Illegal moves" rule (Chuck Bower+, May 2004)
- Illegal plays (Bob+, Aug 2002)
- Illegal plays (Marc Gray, Nov 1995)
- Illegal plays that can't be condoned (Matt Cohn-Geier+, Feb 2011)
- Is stalemate possible? (Jan Andrew Bloxham+, July 1995)
- Jacoby rule (Daniel Murphy, Dec 1997)
- Jacoby rule ambiguity? (Chuck Bower+, Mar 2011)
- Jacoby rule--Good or bad? (neilkaz+, May 2006)
- Legal roll (Sture Lifh+, July 2004)
- Legal roll (Gregg Cattanach, Oct 2001)
- Moving checkers unambiguously (Timothy Chow+, Oct 2009)
- Moving checkers with two hands (Michael Strato+, June 2000)
- Must a hit checker be placed on the bar? (Dani+, May 2006)
- Pick and pass and bearing off (SimonW+, Jan 2005)
- Play cubeless at 2away/2away? (Raccoon+, Oct 2005)
- Repairing an illegal play (Michael J. Zehr, Apr 1995)
- Resigning (Bob Lang+, Aug 2002)
- Rolling on wrong side of board (Ian Shaw+, Aug 2004)
- Rolling on wrong side of board (Kit Woolsey, Jan 1999)
- Rolling on wrong side of board (Kit Woolsey, Sept 1998)
- Rolling on wrong side of board (Bob Hoey, Apr 1998)
- Rolling too soon (TonyM+, Feb 2007)
- Rolling too soon (Stephen Turner, Feb 1998)
- Rolling too soon (James Grenier+, Sept 1996)
- Talking during play (EdmondT+, Dec 2000)
- Touch-move rule in backgammon? (Ken Bame+, Nov 2006)
- Touch-move rule in backgammon? (Austefjord+, May 2002)
- U.S. backgammon tournament rules (Butch Meese, Nov 1997)
- When do you give up your chance to double? (Paul Epstein+, July 2005)
- When is a move over? (JP White, May 2000)
- Overview (Daniel Murphy, Apr 2001)
From GammOnLine
Long message
Recommended reading
Recent addition
|
| |
|