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interests / rec.games.backgammon / 43 to play at 4a3a - Anchor up or do something else?

SubjectAuthor
* 43 to play at 4a3a - Anchor up or do something else?ah....Clem
+- Re: 43 to play at 4a3a - Anchor up or do something else?badgolferman
+* Re: 43 to play at 4a3a - Anchor up or do something else?Timothy Chow
|`- Re: 43 to play at 4a3a - Anchor up or do something else?Timothy Chow
`- XGR++ 43 to play at 4a3a - Anchor up or do something else?ah....Clem

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43 to play at 4a3a - Anchor up or do something else?

<s6kgqv$297$1@dont-email.me>

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From: ah_c...@ymail.com (ah....Clem)
Newsgroups: rec.games.backgammon
Subject: 43 to play at 4a3a - Anchor up or do something else?
Date: Sat, 1 May 2021 17:22:39 -0400
Organization: The Future Fair
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 by: ah....Clem - Sat, 1 May 2021 21:22 UTC

XGID=----BBD-C--aeB---d-e---AA-:0:0:1:43:1:2:0:5:10

X:You O:O
Score is X:1 O:2 5 pt.(s) match.
+13-14-15-16-17-18------19-20-21-22-23-24-+
| X O | | O X X |
| X O | | O |
| O | | O |
| O | | O |
| | | O |
| |BAR| |
| O | | |
| O | | X |
| O X | | X |
| O X | | X X X |
| O O X | | X X X |
+12-11-10--9--8--7-------6--5--4--3--2--1-+
Pip count X: 139 O: 141 X-O: 1-2/5
Cube: 1
X to play 43

Re: 43 to play at 4a3a - Anchor up or do something else?

<xn0mxejgjf1472m000@nntp.aioe.org>

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From: REMOVETH...@gmail.com (badgolferman)
Newsgroups: rec.games.backgammon
Subject: Re: 43 to play at 4a3a - Anchor up or do something else?
Date: Sun, 2 May 2021 10:24:06 +0000 (UTC)
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 by: badgolferman - Sun, 2 May 2021 10:24 UTC

ah....Clem wrote:

>
>
>XGID=----BBD-C--aeB---d-e---AA-:0:0:1:43:1:2:0:5:10
>
>X:You O:O
>Score is X:1 O:2 5 pt.(s) match.
> +13-14-15-16-17-18------19-20-21-22-23-24-+
> | X O | | O X X |
> | X O | | O |
> | O | | O |
> | O | | O |
> | | | O |
> | |BAR| |
> | O | | |
> | O | | X |
> | O X | | X |
> | O X | | X X X |
> | O O X | | X X X |
> +12-11-10--9--8--7-------6--5--4--3--2--1-+
>Pip count X: 139 O: 141 X-O: 1-2/5
>Cube: 1
>X to play 43

If I set an anchor at the 20-point O will easily enter his home board
by jumping past me. I think it's better to keep one of them back to
protect against that.

23/20, 8/4

Re: 43 to play at 4a3a - Anchor up or do something else?

<s6mc67$n02$1@dont-email.me>

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From: tchow12...@yahoo.com (Timothy Chow)
Newsgroups: rec.games.backgammon
Subject: Re: 43 to play at 4a3a - Anchor up or do something else?
Date: Sun, 2 May 2021 10:15:33 -0400
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 by: Timothy Chow - Sun, 2 May 2021 14:15 UTC

On 5/1/2021 5:22 PM, ah....Clem wrote:
>
>
> XGID=----BBD-C--aeB---d-e---AA-:0:0:1:43:1:2:0:5:10
>
> X:You   O:O
> Score is X:1 O:2 5 pt.(s) match.
> +13-14-15-16-17-18------19-20-21-22-23-24-+
> | X           O    |   | O           X  X |
> | X           O    |   | O                |
> |             O    |   | O                |
> |             O    |   | O                |
> |                  |   | O                |
> |                  |BAR|                  |
> | O                |   |                  |
> | O                |   | X                |
> | O           X    |   | X                |
> | O           X    |   | X  X  X          |
> | O  O        X    |   | X  X  X          |
> +12-11-10--9--8--7-------6--5--4--3--2--1-+
> Pip count  X: 139  O: 141 X-O: 1-2/5
> Cube: 1
> X to play 43

I encountered a similar position recently (did I post it?).
X has a much stronger board; O has escaped and has no structure.
I think X should not anchor up. There is not much danger of
getting attacked and he wants good board coverage. Maybe just
8/4 6/3 building his board. 23/20 8/4 is also possible but I'm
not sure that's better---it eyes the outfield but also gives O
more jokers.

---
Tim Chow

Re: 43 to play at 4a3a - Anchor up or do something else?

<s6mcpf$pld$1@dont-email.me>

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From: tchow12...@yahoo.com (Timothy Chow)
Newsgroups: rec.games.backgammon
Subject: Re: 43 to play at 4a3a - Anchor up or do something else?
Date: Sun, 2 May 2021 10:25:50 -0400
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 by: Timothy Chow - Sun, 2 May 2021 14:25 UTC

On 5/2/2021 10:15 AM, Timothy Chow wrote:
> I encountered a similar position recently (did I post it?).

This might have been the one I was thinking of:

https://groups.google.com/g/rec.games.backgammon/c/3gKouJngldk/m/6SIgthWQDAAJ

---
Tim Chow

XGR++ 43 to play at 4a3a - Anchor up or do something else?

<s6p6kj$v04$1@dont-email.me>

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From: ah_c...@ymail.com (ah....Clem)
Newsgroups: rec.games.backgammon
Subject: XGR++ 43 to play at 4a3a - Anchor up or do something else?
Date: Mon, 3 May 2021 11:59:14 -0400
Organization: The Future Fair
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 by: ah....Clem - Mon, 3 May 2021 15:59 UTC

And the answer is "do something else". Anchoring is a whopper with
cheese AtS and is eighth best according to XGR++.

Note that anchoring wins more games and loses fewest gammons, so would
be correct at GS or DMP. AtS, the price of gammon is not particularly
elevated with the cube in the center, but there are sufficiently more
gammons to be had by staying back and exchanging hits that the DMP play
is too weak.

One way to think about it is that anchoring effectively neutralizes X's
superior board. See variants below for same position at different scores.

XGID=----BBD-C--aeB---d-e---AA-:0:0:1:43:1:2:0:5:10

X:Player 1 O:Player 2
Score is X:1 O:2 5 pt.(s) match.
+13-14-15-16-17-18------19-20-21-22-23-24-+
| X O | | O X X |
| X O | | O |
| O | | O |
| O | | O |
| | | O |
| |BAR| |
| O | | |
| O | | X |
| O X | | X |
| O X | | X X X |
| O O X | | X X X |
+12-11-10--9--8--7-------6--5--4--3--2--1-+
Pip count X: 139 O: 141 X-O: 1-2/5
Cube: 1
X to play 43

1. XG Roller++ 23/20 8/4 eq:+0.290
Player: 52.25% (G:13.06% B:0.17%)
Opponent: 47.75% (G:4.96% B:0.15%)

2. XG Roller++ 23/20 6/2 eq:+0.255 (-0.035)
Player: 51.20% (G:13.62% B:0.17%)
Opponent: 48.80% (G:5.80% B:0.21%)

3. XG Roller++ 24/20 6/3 eq:+0.225 (-0.065)
Player: 51.07% (G:12.31% B:0.18%)
Opponent: 48.93% (G:5.41% B:0.18%)

4. XG Roller++ 24/21 8/4 eq:+0.225 (-0.065)
Player: 50.94% (G:12.70% B:0.16%)
Opponent: 49.06% (G:5.83% B:0.20%)

5. XG Roller++ 24/20 8/5 eq:+0.216 (-0.074)
Player: 51.24% (G:11.48% B:0.15%)
Opponent: 48.76% (G:5.04% B:0.15%)

6. XG Roller++ 8/4 6/3 eq:+0.184 (-0.107)
Player: 50.40% (G:14.54% B:0.20%)
Opponent: 49.60% (G:6.30% B:0.23%)

7. XG Roller++ 8/5 6/2 eq:+0.156 (-0.134)
Player: 49.97% (G:13.66% B:0.16%)
Opponent: 50.03% (G:6.10% B:0.22%)

8. XG Roller++ 24/20 23/20 eq:+0.141 (-0.150)
Player: 53.90% (G:3.15% B:0.05%)
Opponent: 46.10% (G:1.54% B:0.03%)

9. XG Roller++ 8/5 8/4 eq:+0.139 (-0.151)
Player: 49.29% (G:13.69% B:0.17%)
Opponent: 50.71% (G:6.30% B:0.22%)

eXtreme Gammon Version: 2.10, MET: Kazaross XG2

Variant 1 Same position, DMP: Anchoring is correct.
XGID=----BBD-C--aeB---d-e---AA-:0:0:1:43:0:0:0:1:10

1. XG Roller++ 24/20 23/20 eq:+0.072
Player: 53.62% (G:3.79% B:0.07%)
Opponent: 46.38% (G:1.69% B:0.04%)

2. XG Roller++ 23/20 8/4 eq:+0.049 (-0.024)
Player: 52.44% (G:12.88% B:0.24%)
Opponent: 47.56% (G:5.07% B:0.16%)

3. XG Roller++ 23/20 6/2 eq:+0.033 (-0.040)
Player: 51.63% (G:12.59% B:0.21%)
Opponent: 48.37% (G:5.52% B:0.19%)

4. XG Roller++ 24/20 8/5 eq:+0.027 (-0.046)
Player: 51.33% (G:11.31% B:0.21%)
Opponent: 48.67% (G:4.81% B:0.15%)

5. 3-ply 24/20 6/3 eq:+0.031 (-0.042)
Player: 51.53% (G:11.26% B:0.19%)
Opponent: 48.47% (G:5.03% B:0.14%)

eXtreme Gammon Version: 2.10, MET: Kazaross XG2

Variant 2 Same position, Unlimited Jacoby Beavers. Error is much smaller:

XGID=----BBD-C--aeB---d-e---AA-:0:0:1:43:0:0:3:0:10

1. XG Roller++ 23/20 8/4 eq:+0.155
Player: 52.38% (G:12.76% B:0.19%)
Opponent: 47.62% (G:4.98% B:0.16%)

2. XG Roller++ 24/20 23/20 eq:+0.129 (-0.026)
Player: 53.68% (G:3.57% B:0.05%)
Opponent: 46.32% (G:1.68% B:0.04%)

3. XG Roller++ 23/20 6/2 eq:+0.117 (-0.038)
Player: 51.46% (G:13.17% B:0.18%)
Opponent: 48.54% (G:5.64% B:0.20%)

4. XG Roller++ 24/20 8/5 eq:+0.104 (-0.051)
Player: 51.29% (G:11.53% B:0.17%)
Opponent: 48.71% (G:5.02% B:0.15%)

5. XG Roller++ 24/21 8/4 eq:+0.102 (-0.053)
Player: 51.05% (G:12.28% B:0.18%)
Opponent: 48.95% (G:5.56% B:0.17%)

eXtreme Gammon Version: 2.10

--
Ah....Clem
The future is fun, the future is fair.

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