Simborg Video Lesson: The Rule of Four

Simborg Video Lesson: The Rule of Four.
Featured content exclusively for USBGF Premium, Youth, & Basic Members.

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USBGF2016 August Online Circuit

Bruce_Farquhar2016

Congratulations to Bruce Farquhar, winner of the USBGF 2016 August Monthly Circuit. Bruce won this single elimination tournament by defeating Bill Riles in the 17-point final match. Igor Erovenko and David Kettler finished 3/4 in the 15-point semi-final match.

American Backgammon Hall of Fame (HOF)

Call for Nominations

The American Backgammon Hall of Fame recognizes those individuals who have made extraordinary contributions to the game of backgammon in the United States. Candidates are not limited to those who are American citizens, provided that they have met eligibility requirements.

Use the Hall of Fame Nominations Form to nominate a candidate for this significant honor. All Premium, Youth, and Basic members are invited to nominate candidates for consideration.

Candidates to the HOF should be individuals who have:
1. A significant body of work over a substantial period of time, in or for the game of backgammon in the United States, as players, directors, authors, publishers, promoters, teachers, and/or innovators;
2. Realized exceptional accomplishments;
a. Demonstrated remarkable skill through success over the board. And/or…
b. Gained achievements and recognition among the U.S. backgammon community.

Current members of the American Backgammon Hall of Fame (listed alphabetically):
Nack Ballard, Carol Joy Cole, Barclay Cooke, Bill Davis, Malcolm Davis, Patrick Gibson, Kent Goulding, Tim Holland, Oswald Jacoby, Neil Kazaross, Paul Magriel, Howard Markowitz, Bill Robertie, Mike Senkiewicz, Walter Trice, and Kit Woolsey.

To nominate a person for consideration to the 2016 Ballot for possible induction into the American Backgammon Hall of Fame, please see the Hall of Fame Nominations Form. You will need to be logged in to access the form.

You’ll be asked to complete the form with two main sections: (1) Notable awards and accomplishments (wins, publications, produced [events], Giants, ABT…) and (2) WHY do you think s/he should be considered (a paragraph describing nominee’s significant body of work in or for backgammon).

The open period for 2016 nominations is September 22nd through October 31st. This opportunity allows USBGF members to submit their candidates for consideration for possible inclusion on the Ballot. The Ballot will then go to the HOF electors to vote to determine any new inductees.

Patrick Gibson
Chairman, Hall of Fame Committee
U.S. Backgammon Federation

2016 Federation Cup Qualifier 9

Congratulations to Narvey Goldman, winner of the 2016 Federation Cup Qualifier 9. Narvey defeated Jason Lee in the 17-point final. Igor Erovenko and Forrest Faulk finished 3/4 in the 17-point semi-final.

The USBGF Federation Cup is a free entry tournament for all USBGF members – including Premium, Youth, and Basic members and both U.S. and international members. It is one of the biggest and most exciting online tournaments of the year and features an excellent prize pool. The first place winner of the Federation Cup Playoff will receive $500, second place $250, and third/fourth $125. To obtain a place in the Playoff, players must win a 32-player qualifier bracket. Twelve qualifiers have been held so far and another 4 are expected to be filled over the summer with the Playoff kicking off in November. Members who lose their match have up to two free re-entries. So sign up now and have 3 chances to win a place in the Federation Cup Playoff for fun, fame, and fortune!

Those who have qualified to date include: Antoinette-Marie Williams, Bill Riles, Bruce Farquhar, Cynthia Belonogoff, David Giorgadze, David Kettler, John Klein, and Marv Porten, in addition to the most recent winner Narvey Goldman. narvey

USBGF OLM 2016-07-10

[Previous][Next]

Last vote on the OLM:

is Neil Kazaross

score: 5
pip: 52
             
11 point match
              pip: 56
score: 9

is USBGF Members
XGID=aBCBBBD---------------ecf-:1:1:1:11:9:5:0:11:10
to play 11

1.playedRollout16/5(2) 2/Offeq: +0.955
Player:
Opponent:
97.73% (G:2.46% B:0.04%)
2.27% (G:0.00% B:0.00%)
Conf.: ± 0.000 (+0.954...+0.955) - [100.0%]
Duration: 13.8 seconds
2.Rollout16/4 2/Offeq: +0.937 (-0.018)
Player:
Opponent:
96.83% (G:2.80% B:0.04%)
3.17% (G:0.00% B:0.00%)
Conf.: ± 0.000 (+0.936...+0.937) - [0.0%]
Duration: 24.0 seconds
3.Rollout16/5 6/4 2/1eq: +0.933 (-0.022)
Player:
Opponent:
96.64% (G:2.11% B:0.03%)
3.36% (G:0.00% B:0.00%)
Conf.: ± 0.000 (+0.933...+0.933) - [0.0%]
Duration: 12.0 seconds
4.Rollout16/4(2)eq: +0.929 (-0.026)
Player:
Opponent:
96.44% (G:1.93% B:0.03%)
3.56% (G:0.00% B:0.00%)
Conf.: ± 0.000 (+0.929...+0.929) - [0.0%]
Duration: 8.2 seconds
5.Rollout16/5 6/3eq: +0.922 (-0.032)
Player:
Opponent:
96.11% (G:1.95% B:0.03%)
3.89% (G:0.00% B:0.00%)
Conf.: ± 0.000 (+0.922...+0.922) - [0.0%]
Duration: 14.5 seconds
6.Rollout12/Off 1/Off(2)eq: +0.901 (-0.053)
Player:
Opponent:
95.07% (G:2.83% B:0.06%)
4.93% (G:0.00% B:0.00%)
Conf.: ± 0.000 (+0.901...+0.902) - [0.0%]
Duration: 1 minute 28 seconds
7.Rollout16/3 2/1eq: +0.888 (-0.067)
Player:
Opponent:
94.40% (G:1.94% B:0.03%)
5.60% (G:0.00% B:0.00%)
Conf.: ± 0.000 (+0.888...+0.889) - [0.0%]
Duration: 29.5 seconds
8.Rollout16/5(2) 1/Off(2)eq: +0.887 (-0.068)
Player:
Opponent:
94.35% (G:2.25% B:0.04%)
5.65% (G:0.00% B:0.00%)
Conf.: ± 0.000 (+0.887...+0.887) - [0.0%]
Duration: 1 minute 06 seconds
9.Rollout16/4 1/Off(2)eq: +0.880 (-0.075)
Player:
Opponent:
93.98% (G:2.61% B:0.04%)
6.02% (G:0.00% B:0.00%)
Conf.: ± 0.000 (+0.879...+0.880) - [0.0%]
Duration: 1 minute 13 seconds
10.Rollout16/2eq: +0.844 (-0.110)
Player:
Opponent:
92.21% (G:1.70% B:0.02%)
7.79% (G:0.00% B:0.00%)
Conf.: ± 0.000 (+0.844...+0.845) - [0.0%]
Duration: 52.2 seconds
11.Rollout12/1(2) 2/Offeq: +0.814 (-0.140)
Player:
Opponent:
90.71% (G:1.06% B:0.01%)
9.29% (G:0.00% B:0.00%)
Conf.: ± 0.000 (+0.814...+0.815) - [0.0%]
Duration: 1 minute 29 seconds
 
1 7776 Games rolled with Variance Reduction.
Dice Seed: 39992044
Moves: 4-ply, cube decisions: XG Roller+

eXtreme Gammon Version: 2.10, MET: Kazaross XG2

USBGF Members vote:
[27] 6/5(2) 2/0
[ 1] 6/4(2)
[ 1] 2/0 1/0(2)


Mary Hickey recommends: 6/5(2) 2/0

Getting that first checker off is big, so there’s no reason not to start with 2/off. Another play would have to fight pretty hard to beat that! But there’s no fight going on, since 6/5(2) is perfectly safe for next turn, and again also leaves a good position after the 66, if we roll it. 6/5(2) 2/off looks like a clear winner.



USBGF Members: 64 6/4 6/0
Neil Kazaross: 32 no play


Today’s vote:

is Neil Kazaross

score: 5
pip: 52
             
11 point match
              pip: 44
score: 9

is USBGF Members
XGID=aBBBCD----------------ecf-:1:1:1:42:9:5:0:11:10
to play 42

eXtreme Gammon Version: 2.10

USBGF OLM 2016-06-19

[Previous][Next]

Last vote on the OLM:

is Neil Kazaross

score: 5
pip: 126
             
11 point match
              pip: 156
score: 9

is USBGF Members
XGID=a--BB-C-B-a-bC-a--bbbbbC--:1:1:1:43:9:5:0:11:10
to play 43

1.playedXG Roller++13/9 13/10*eq: -0.516
Player:
Opponent:
37.63% (G:14.65% B:0.79%)
62.37% (G:22.02% B:1.47%)
2.XG Roller++13/10* 10/6eq: -0.590 (-0.074)
Player:
Opponent:
33.12% (G:12.20% B:0.62%)
66.88% (G:21.32% B:1.18%)

eXtreme Gammon Version: 2.10, MET: Kazaross XG2

USBGF Members vote:
[18] 13/10* 13/9
[ 5] 13/10*/6


Mary Hickey recommends: 13/10* 13/9

Another great roll providing us with an opportunity to try hard for a win going forward. Of course we will hit, 13/10*, to keep him busy while we try to roll some 6s and get out of defense mode. But while we hold that thought, we also very much want to make our 5 point and push him to the back of our home board where he can’t do us much harm. That means this is no time for weenieing by picking up the hitting checker. Instead, we need to bring down another builder for the 5 point with 13/9. It helps our game that this move gives us monster diversification — 6s run, and many other numbers make the 5 point. Life is good, at least until we see what he rolls!



Neil Kazaross: 63 no play
USBGF Members: 51 10/5 6/5
Neil Kazaross: 33 no play


Today’s vote:

is Neil Kazaross

score: 5
pip: 136
             
11 point match
              pip: 143
score: 9

is USBGF Members
XGID=b--BBBB-BA--bA-a--bbbbbC--:1:1:1:11:9:5:0:11:10
to play 11

eXtreme Gammon Version: 2.10

Make Your Play!
Enter Your Checker Play or Cube Decision
Please do not include comments in your submission.

Voting to close no earlier than Mon 6/20 300p Eastern time.

USBGF Masters Divisional XXIV

Mislav Kovacic_rev_2016 Feb

Congratulations to Mislav Kovačić winner of the Masters XXIV. Mislav defeated Alfred Mamlet in the 21 point final. Finishing 3/4 were Igor Erovenko and Ken Bame in the 19-point semi-final.

USBGF OLM 2016-02-20 End of Match #5 Game #3

[Previous][Next]

Last vote on the OLM:

is Neil Kazaross

score: 3
pip: 39
             
11 point match
              pip: 71
score: 0

is USBGF Members
XGID=--BEC-BB------A-----dc-bc-:1:1:1:53:0:3:0:11:10
to play 53

1.xgRollout114/9 7/4eq: -0.968
Player:
Opponent:
1.46% (G:0.00% B:0.00%)
98.54% (G:0.00% B:0.00%)
Conf.: ± 0.000 (-0.968...-0.968) - [100.0%]
Duration: 2 minutes 14 seconds
2.playedRollout114/6eq: -0.970 (-0.002)
Player:
Opponent:
1.35% (G:0.00% B:0.00%)
98.65% (G:0.00% B:0.00%)
Conf.: ± 0.000 (-0.971...-0.970) - [0.0%]
Duration: 2 minutes 25 seconds
3.Rollout17/4 7/2eq: -0.973 (-0.005)
Player:
Opponent:
1.23% (G:0.00% B:0.00%)
98.77% (G:0.01% B:0.00%)
Conf.: ± 0.000 (-0.973...-0.973) - [0.0%]
Duration: 1 minute 33 seconds
 
1 7776 Games rolled with Variance Reduction.
Dice Seed: 1797196
Moves: 4-ply, cube decisions: XG Roller+

eXtreme Gammon Version: 2.10, MET: Kazaross XG2

USBGF Members vote:
[23] 14/6
[ 4] 14/9 7/4
[ 1] 7/4 7/2


Mary Hickey recommends: 14/9 7/4

14/9 7/4 takes two crossovers, and also gives us two different ways to cross an outside checker over to the gap on the 5 point next time. It’s unlikely to matter, but who knows? And since a fourth checker on the 4 point will allow us to take four men off with a double 4, we don’t have to worry too much about the wasted pips, either.



Neil Kazaross: 61 5/0 1/0
USBGF Members: 41 7/6 7/3
Neil Kazaross: 53 5/2 5/0
USBGF Members: 51 6/0
Neil Kazaross: 21 2/0 1/0
USBGF Members: 42 4/0 2/0
Neil Kazaross: 53 5/0 4/1
USBGF Members: 55 6/1(3) 4/0
Neil Kazaross: 65 4/0(2)


Neil Kazaross wins two points and leads 6-away/11-away

USBGF Advanced Divisional VIII

Ken Meng_ADV_Div_VIII

Congratulations to Ken Meng, winner of the Advanced Divisional VIII. Ken defeated Patricia Johnson in the 17-point final match. Finishing 3/4 in the 15-point semi-finals were Dale Snow and Andreas Graf. The Advanced Divisional is a single-elimination tournament, requiring players to have a Circuit Elo rating between 1500.01 – 1649.99 at the time of registration.

USBGF OLM 2015-05-23

[Previous][Next]

Last vote on the OLM:

is Neil Kazaross

score: 8
pip: 130
             
11 point match
              pip: 139
score: 4

is USBGF Members
XGID=--Ba-aCDBA-a----acAccbA-A-:1:-1:1:21:4:8:0:11:10
to play 21

1.xgRollout118/16* 6/5*eq: +0.062
Player:
Opponent:
49.12% (G:20.53% B:2.08%)
50.88% (G:23.79% B:8.16%)
Conf.: ± 0.008 (+0.055...+0.070) - [100.0%]
Duration: 1 hour 23 minutes
2.playedRollout17/5* 6/5eq: +0.040 (-0.023)
Player:
Opponent:
47.14% (G:21.76% B:2.69%)
52.86% (G:25.48% B:6.05%)
Conf.: ± 0.008 (+0.032...+0.047) - [0.0%]
Duration: 1 hour 14 minutes
3.Rollout16/5* 5/3*eq: +0.035 (-0.027)
Player:
Opponent:
46.62% (G:23.13% B:3.03%)
53.38% (G:28.02% B:8.91%)
Conf.: ± 0.008 (+0.027...+0.042) - [0.0%]
Duration: 1 hour 21 minutes
4.Rollout118/16* 9/8eq: -0.205 (-0.267)
Player:
Opponent:
41.29% (G:13.39% B:1.00%)
58.71% (G:24.51% B:3.83%)
Conf.: ± 0.007 (-0.212...-0.198) - [0.0%]
Duration: 1 hour 22 minutes
 
1 1296 Games rolled with Variance Reduction.
Dice Seed: 93530544
Moves: 4-ply, cube decisions: XG Roller+

eXtreme Gammon Version: 2.10, MET: Kazaross XG2

USBGF Members vote:
[11] 7/5* 6/5
[ 8] 18/16* 6/5*
[ 3] 6/5*/3*
[ 1] 18/16* 9/8


Mary Hickey recommends: 7/5* 6/5

There are two double-hit plays that have merit here, since even if things go blooie we aren’t likely to be redoubled out. One is 6/5*/3*, trying to blitz him off the board, and the other is 18/16* 6/5*, sending another of his men back and making it harder for him to build forward.

But I’m not convinced either of these plays is any better, with or without the score and cube situation, than simply making the 5 point. We unquestionably want that point, and it’s useful to us for a very long time, so that’s my recommendation today — point on him on a point we want, 7/5* 6/5.



Neil Kazaross: 62 no play


Today’s vote:

is Neil Kazaross

score: 8
pip: 135
             
11 point match
              pip: 136
score: 4

is USBGF Members
XGID=a-Ba-BBCBA-a----acAccbA-A-:1:-1:1:53:4:8:0:11:10
to play 53

eXtreme Gammon Version: 2.10

Make Your Play!
Enter Your Checker Play or Cube Decision
Please do not include comments in your submission.

Voting to close no earlier than Sun 5/24 5pm Eastern time.

USBGF OLM 2014-11-27

[Previous][Next]

Last vote on the OLM:

is Neil Kazaross

score: 7
pip: 45
             
11 point match
              pip: 53
score: 9

is USBGF Members
XGID=aBCBCCB--------------a-cj-:1:1:1:11:9:7:0:11:10
to play 11

1.playedRollout15/3 2/Offeq: +0.961
Player:
Opponent:
98.03% (G:2.95% B:0.05%)
1.97% (G:0.00% B:0.00%)
Conf.: ± 0.000 (+0.961...+0.961) - [100.0%]
Duration: 9.0 seconds
2.Rollout14/Offeq: +0.949 (-0.012)
Player:
Opponent:
97.43% (G:3.03% B:0.05%)
2.57% (G:0.00% B:0.00%)
Conf.: ± 0.000 (+0.948...+0.949) - [0.0%]
Duration: 16.6 seconds
3.Rollout12/Off 1/Off(2)eq: +0.938 (-0.023)
Player:
Opponent:
96.88% (G:4.22% B:0.09%)
3.12% (G:0.00% B:0.00%)
Conf.: ± 0.000 (+0.937...+0.938) - [0.0%]
Duration: 31.6 seconds
 
1 7776 Games rolled with Variance Reduction.
Dice Seed: 67939651
Moves: 4-ply, cube decisions: XG Roller+

eXtreme Gammon Version: 2.10, MET: Kazaross XG2

USBGF Members vote:
[20] 5/3 2/0
[ 2] 5/1
[ 1] 2/0 1/0(2)


Marty Storer recommends: 5/3 2/0

White plays 2/off and looks for two more aces. There seems little reason to do anything but play safe with 5/3. Black is a huge underdog now and White doesn’t want to give him an extra chance to hit, or to enter with an ace and then win the race.



USBGF Members: 65 6/1 6/0
Neil Kazaross: 44 no play


Today’s vote:

is Neil Kazaross

score: 7
pip: 45
             
11 point match
              pip: 38
score: 9

is USBGF Members
XGID=aCBCCB---------------a-cj-:1:1:1:31:9:7:0:11:10
to play 31

eXtreme Gammon Version: 2.10

USBGF OLM 2014-10-07

[Previous][Next]

Last vote on the OLM:

is Neil Kazaross

score: 7
pip: 147
             
11 point match
              pip: 150
score: 8

is USBGF Members
XGID=-a-B--D-C-a-cDa--c-db-B---:0:0:1:33:8:7:0:11:10
to play 33

1.playedRollout113/10*(2) 8/5(2)eq: +0.392
Player:
Opponent:
59.24% (G:27.98% B:2.44%)
40.76% (G:10.31% B:0.82%)
Conf.: ± 0.006 (+0.386...+0.398) - [100.0%]
Duration: 9 hours 26 minutes
2.Rollout113/10* 8/5(3)eq: +0.366 (-0.026)
Player:
Opponent:
58.63% (G:27.87% B:2.23%)
41.37% (G:10.30% B:0.74%)
Conf.: ± 0.006 (+0.360...+0.372) - [0.0%]
Duration: 8 hours 36 minutes
 
1 7776 Games rolled with Variance Reduction.
Dice Seed: 70680161
Moves: 4-ply, cube decisions: XG Roller+

eXtreme Gammon Version: 2.10, MET: Kazaross XG2

USBGF Members vote:
[18] 13/10*(2) 8/5(2)
[ 6] 13/10* 8/5(3)
[ 3] 13/10*/7(2)


Marty Storer recommends: 13/10*(2) 8/5(2)

The first three 3s are easy: 13/10* 8/5(2). White can make the bar point, blotless, but the 5 point is worth much more–both short-term (Black is on the bar and a third inner-board point adds five ways to fan) and long-term (the stronger inner board figures to pay dividends over the course of the game).

The question is whether to make the 10 point, or to lift the more vulnerable blot. The 5 point is a safer place for the builder-attacker than the 8 point, and a blot on the 10 point is less vulnerable because it’s more distant from the points on which Black may enter. 8/5 saves one immediate shot and possibly more later. Also, a builder on the 5 point aims directly at all three open points in White’s board, not just at two of those points.

But the 10 point is a new point, and the 8-point blot may be covered. It’s true that making the 10 point strips the midpoint, but it’s very often a good idea to make a new point if you can. I prefer 13/10*(2) 8/5(2) slightly over 13/10* 8/5(3).


Neil Kazaross to play:

is Neil Kazaross

score: 7
pip: 157
             
11 point match
              pip: 138
score: 8

is USBGF Members
XGID=aa-B-BD-A-B-cBa--c-db-B---:0:0:-1:11:8:7:0:11:10
to play 11

1.playedXG Roller++Bar/23 24/23 6/5eq: -0.140
Player:
Opponent:
45.13% (G:9.96% B:0.35%)
54.87% (G:15.95% B:0.74%)
2.XG Roller++Bar/23 24/23 11/10eq: -0.183 (-0.043)
Player:
Opponent:
44.21% (G:10.00% B:0.38%)
55.79% (G:16.56% B:0.79%)

eXtreme Gammon Version: 2.10, MET: Kazaross XG2

Neil Kazaross plays b/23 24/23 6/5.

This roll is a good response to White’s joker 33 last turn. I make the 23 point and then have a nice smoothing build 6/5 to play. Now I should be able to hang in this game for a while.


Today’s vote:

is Neil Kazaross

score: 7
pip: 153
             
11 point match
              pip: 138
score: 8

is USBGF Members
XGID=--bB-BD-A-B-cBa--c-cc-B---:0:0:1:55:8:7:0:11:10
to play 55

eXtreme Gammon Version: 2.10

USBGF OLM 2014-09-29

[Previous][Next]

Last vote on the OLM:

is Neil Kazaross

score: 7
pip: 163
             
11 point match
              pip: 159
score: 8

is USBGF Members
XGID=-b-B--D-B---eE---b-db---B-:0:0:1:51:8:7:0:11:10
to play 51

1.playedXG Roller++24/23 13/8eq: -0.282
Player:
Opponent:
47.01% (G:13.65% B:0.68%)
52.99% (G:15.89% B:0.60%)
2.XG Roller++24/18eq: -0.356 (-0.074)
Player:
Opponent:
46.24% (G:12.82% B:0.77%)
53.76% (G:17.42% B:0.64%)

eXtreme Gammon Version: 2.10, MET: Kazaross XG2

USBGF Members vote:
[22] 24/23 13/8


Marty Storer recommends: 24/23 13/8

White can slot the 5 point, trying to catch up or even go ahead in blocking development. The alternative is to split with either 24/23 13/8 or 24/18.

Several factors count against slotting. The first is that White is slightly ahead in the race. If the game turns into prime versus prime, a lead in the race won’t be helpful.

The second is that White has already used one checker from his original 6-point stack to make a point. Thus it’s no longer urgent to unstack from the 6.

The third is that White is ahead at the -4 to -3 score, where the trailer wants to increase volatility in hopes of winning a gammon. In this position, slotting increases volatility. The score also means that White will be wary of taking a 2-cube where Black has decent gammon chances: a doubled gammon wins the match for Black, while any four-point win comes with “overage” for White, who can use only three of the four points at stake.

The most important factor, related to the third, is the great danger White takes by slotting. Black hits with 13 numbers, after which he’ll already start to think about doubling. Black has a few other good replies as well: 66 65 61 55 33 22 11, and none of his replies is terrible.

All in all, splitting is the clear choice. How should White split?

The meek 24/23 13/8 is safer than 24/18. It caters to White’s small lead in the race and minimizes the risk of being attacked while Black has a better-quality board. Finally, the minor split makes progress on both sides of the board, unstripping the 8 point as well as putting pressure on Black’s stripped 8. I recommend the minor split, which is standard after both sides have opened by making an inner-board point or the bar.


Neil Kazaross to play:

is Neil Kazaross

score: 7
pip: 163
             
11 point match
              pip: 153
score: 8

is USBGF Members
XGID=-b-B--D-C---eD---b-db--AA-:0:0:-1:00:8:7:0:11:10
on roll, cube action?

Analyzed in XG Roller++No doubleDouble/Take
  Player Winning Chances:53.30% (G:16.02% B:0.60%)53.20% (G:16.47% B:0.61%)
  Opponent Winning Chances:46.70% (G:13.71% B:0.67%)46.80% (G:14.06% B:0.72%)
  Cubeless Equities+0.014+0.356
Cubeful Equities
played No double:+0.298
     Double/Take:+0.112 (-0.185)
     Double/Pass:+1.000 (+0.702)
 
Best Cube action: No double / Take
Percentage of wrong pass needed to make the double decision right: 17.3%

eXtreme Gammon Version: 2.10, MET: Kazaross XG2

Neil Kazaross does not double.

Here I have only a slight advantage and nothing resembling a cube even at this score. More interesting would be my cube decision if I trailed 4-away/2-away.

In contrast to this score (-4/-3), at -4/-2 I’d be handing my opponents a totally dead cube and rendering the extra points if they retain the cube and gammon me useless.

At -2/-4, the Rule of 80 says that if the trailer’s total wins and total gammon wins exceeds 80%, the leader must pass the initial double. With that in mind when should one offer a quick double from the center at -4/-2? In the opening with typical volatility and when trailing -4/-2 one should usually cube if the sum of wins and G wins is 70% or higher. I think this position is close to that good, so technically I think this is a borderline cube if I trailed -4/-2.

Here’s more on -4/-2 cubes. http://www.bkgm.com/rgb/rgb.cgi?view+1183

But the actual score is -4/-3 and I should cube later. Typically in the opening I need to have a win and gammon total nearing 80% to cube trailing -4/-3 and I am nowhere near that here. So if I wouldn’t at least pause to consider passing in the early game if I cubed leading -4/-2, I probably don’t have a proper cube trailing -4/-3.

No double, and not close to one.


Neil Kazaross to play:

is Neil Kazaross

score: 7
pip: 163
             
11 point match
              pip: 153
score: 8

is USBGF Members
XGID=-b-B--D-C---eD---b-db--AA-:0:0:-1:52:8:7:0:11:10
to play 52

1.playedXG Roller++13/11 13/8eq: +0.200
Player:
Opponent:
51.21% (G:15.45% B:0.57%)
48.79% (G:14.41% B:0.89%)
2.XG Roller++13/6eq: +0.110 (-0.090)
Player:
Opponent:
49.21% (G:14.86% B:0.51%)
50.79% (G:14.88% B:0.85%)

eXtreme Gammon Version: 2.10, MET: Kazaross XG2

Neil Kazaross plays 13/11 13/8.

This is a fair roll which allows me to work on natural development with 13/11 13/8. Since 63 is blocked, this leaves only 4 shots.


Today’s vote:

is Neil Kazaross

score: 7
pip: 156
             
11 point match
              pip: 153
score: 8

is USBGF Members
XGID=-b-B--D-C---cDa--c-db--AA-:0:0:1:21:8:7:0:11:10
to play 21

eXtreme Gammon Version: 2.10

USBGF OLM 2014-07-13 Start of Match #3 Game #6

[Previous][Next]

Today’s vote:

is Neil Kazaross

score: 7
pip: 167
             
11 point match
              pip: 167
score: 3

is USBGF Members
XGID=-b----E-C---eE---c-e----B-:0:0:1:32:3:7:0:11:10
to play 32

eXtreme Gammon Version: 2.10

USBGF OLM 2014-06-14

[Previous][Next]

Last vote on the OLM:

is Neil Kazaross

score: 7
pip: 156
             
11 point match
              pip: 152
score: 1

is USBGF Members
XGID=-a--a-E-D--BdB--abAdb---A-:0:0:1:65:1:7:0:11:10
to play 65

1.playedRollout124/18 6/1*eq: +0.161
Player:
Opponent:
52.30% (G:11.06% B:0.33%)
47.70% (G:12.39% B:0.98%)
Conf.: ± 0.005 (+0.156...+0.165) - [100.0%]
Duration: 6 hours 27 minutes
2.Rollout124/18 8/3eq: +0.113 (-0.047)
Player:
Opponent:
51.10% (G:10.55% B:0.34%)
48.90% (G:12.75% B:0.97%)
Conf.: ± 0.005 (+0.109...+0.118) - [0.0%]
Duration: 6 hours 22 minutes
3.Rollout124/18 11/6eq: +0.086 (-0.074)
Player:
Opponent:
50.65% (G:9.52% B:0.28%)
49.35% (G:11.85% B:0.78%)
Conf.: ± 0.004 (+0.082...+0.091) - [0.0%]
Duration: 5 hours 54 minutes
4.Rollout124/18 13/8eq: +0.022 (-0.139)
Player:
Opponent:
48.89% (G:9.66% B:0.32%)
51.11% (G:12.28% B:0.90%)
Conf.: ± 0.005 (+0.017...+0.026) - [0.0%]
Duration: 6 hours 11 minutes
 
1 7776 Games rolled with Variance Reduction.
Dice Seed: 4092236
Moves and cube decisions: 4-ply

eXtreme Gammon Version: 2.10, MET: Kazaross XG2

USBGF Members vote:
[17] 24/18 6/1*
[ 1] 24/18 8/3
[ 1] 24/18 11/6
[ 1] 24/18 13/8


Marty Storer recommends: 24/18 6/1*

The 6 is easy: 24/18. For the 5, White must not abandon the midpoint. The choices are 11/6 (minimizing shots but breaking a point), 6/1* (leaving 11 shots and putting a checker into bad position, but gaining a tempo) and 8/3 (the purest alternative, not dumping a checker on the 1 point, but leaving 12 shots and not putting Black on the bar).

I prefer 24/18 6/1*. That move duplicates 4s to cover the 21 and 9 points, and may cause Black some trouble by forcing his next play. Also, there’s the chance he’ll stay on the bar with boxcars. I think those possible gains make 6/1* superior to 8/3. I hate 11/6; I don’t want to stack a sixth checker on the 6 point and break the 11, which is a definite asset.


Neil Kazaross to play:

is Neil Kazaross

score: 7
pip: 157
             
11 point match
              pip: 141
score: 1

is USBGF Members
XGID=aA--a-D-D--BdB--abBdb-----:0:0:-1:51:1:7:0:11:10
to play 51

1.playedRollout1Bar/24* 13/8eq: +0.056
Player:
Opponent:
53.07% (G:18.18% B:1.42%)
46.93% (G:10.63% B:0.44%)
Conf.: ± 0.006 (+0.050...+0.061) - [100.0%]
Duration: 7 hours 34 minutes
2.Rollout1Bar/24* 21/16eq: +0.026 (-0.029)
Player:
Opponent:
52.84% (G:16.21% B:1.47%)
47.16% (G:11.36% B:0.44%)
Conf.: ± 0.006 (+0.020...+0.032) - [0.0%]
Duration: 7 hours 48 minutes
 
1 7776 Games rolled with Variance Reduction.
Dice Seed: 4092236
Moves and cube decisions: 4-ply

eXtreme Gammon Version: 2.10, MET: Kazaross XG2

Neil Kazaross plays b/24* 13/8.

I’m happy to hit bar/24*. Then I think that the best 5 is the developing 13/8 which leaves my position nicely balanced. I could hop out with 21/16 since White’s outfield points are stripped, but 21/16 doesn’t link directly to my builder on the 9 point. Therefore, I think 13/8 makes more sense, and I wouldn’t mind being able to anchor on the 21 point.


Today’s vote:

is Neil Kazaross

score: 7
pip: 151
             
11 point match
              pip: 165
score: 1

is USBGF Members
XGID=-a--a-D-D--BcB--acBdb----A:0:0:1:32:1:7:0:11:10
to play 32

eXtreme Gammon Version: 2.10

USBGF Sponsors Joint Math Meetings Backgammon Event

BenjaminArt-FinneranBill - 2014 Joint Math 017About 50 attendees at the 2014 Joint Mathematics Meeting in Baltimore on January 17 turned out to play, watch, or learn backgammon at the Backgammon Social Event sponsored by the U.S. Backgammon Federation. The event was planned by Harvey Mudd College mathematics professor and USBGF Board member Arthur Benjamin. mathematics professor at Howard Community College and USBGF OLM Editor Jason Lee, and USBGF Chairman of the Board of Directors Karen Davis.  Benjamin, Lee, Davis, and DC-area players including Ed O’Laughlin, Bill Finneran, Mike Lauzon, and Eva Mitter worked with groups of math professors and graduate students at different skill levels ranging from those playing for the first time to competitive players. It was designed to highlight the math aspects of backgammon and recruit more college students and professors to the game, including participation in the annual USBGF Online Collegiate Championship. Conference attendee Matt Lehman from the University of Massachusetts in Boston had this to say. “It was a lot of fun. I got to play a lot of people at my skill level. Backgammon is a fun, social game. The games are fast and you can talk. Especially enjoyable at the end of a long conference.”

 

IBC: Kettler vs Angiuoni Nov 4th at 4:00 PM EDT

Come watch the 1st International Backgammon Championship Round 1 Match:
David Kettler (SuperDavek) USA vs Manlio Angiuoni (BATMANLIO) ITA
playing Friday, November 4th at 4:00 PM EDT on GridGammon!

For further information, see: 1st International Backgammon Championship.

AUTHORS

PRIMETIME BACKGAMMON AUTHORS

  • Jeremy Bagai
  • Arthur Benjamin
  • Peter Bennet
  • Adam Bennett
  • Dorn G. Bishop
  • Chuck Bower
  • Sabri Büyüksoy
  • Matt Cohn-Geier
  • Carol Joy Cole
  • Gus Contos
  • Mike Corbett
  • Bill Davis
  • Karen Davis
  • Malcolm Davis
  • Michael Edge
  • Bruce J. Farquhar
  • Ray Fogerlund
  • Ben Friesen
  • Sean Garber
  • Perry Gartner
  • Martha Ghio
  • Patrick Gibson
  • Harvey Gillis
  • Rochelle Hasson
  • Mary Hickey
  • Julius High
  • Yuki Hiroki
  • Grant Hoffman
  • Iancho Hristov
  • Jake Jacobs
  • Neil Kazaross
  • Raymond Kershaw
  • Danny Kleinman
  • Bob Koca
  • Jason Lee
  • Ken Larsen
  • Michael Mannon
  • Tara Mendicino
  • Masayuki “Mochy” Mochizuki
  • Richard Munitz
  • Justin Nunez
  • Dmitriy Obukhov
  • Anne O’Connor
  • John O’Hagan
  • Jason Pack
  • David Presser
  • Frank Raposa
  • Stick Rice
  • Bill Riles
  • David Rockwell
  • Linda Rockwell
  • David Rubin
  • Patti Rubin
  • Joe Russell
  • Steve Sax
  • Barry Silliman
  • Randee Simborg
  • Phil Simborg
  • Albert Steg
  • Robert Stoller
  • Marty Storer
  • Jim Stutz
  • Robert Wachtel
  • Paul Weaver
  • Kit Woolsey

Updated 2/22/2016

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