This came up in match play, but I don't think the score mattered so
recasting it as unlimited without Jacoby.

Pure play? Mobility? Hybrid? Something else?


XGID=-a---BC-C---bB---cbdBcB-A-:0:0:1:21:0:0:0:0:10

X:Player 1 O:Player 2
Score is X:0 O:0. Unlimited Game
+13-14-15-16-17-18------19-20-21-22-23-24-+
| X O O | | O X O X X |
| X O O | | O X O X |
| O | | O O |
| | | O |
| | | |
| |BAR| |
| | | |
| | | |
| X | | X |
| O X | | X X |
| O X | | X X O |
+12-11-10--9--8--7-------6--5--4--3--2--1-+
Pip count X: 186 O: 124 X-O: 0-0
Cube: 1
X to play 21

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

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)

On 7/6/2023 10:56 PM, ah....Clem wrote:

This came up in match play, but I don't think the score mattered so
recasting it as unlimited without Jacoby.

Pure play? Mobility? Hybrid? Something else?

XGID=-a---BC-C---bB---cbdBcB-A-:0:0:1:21:0:0:0:0:10

X:Player 1   O:Player 2
Score is X:0 O:0. Unlimited Game
 +13-14-15-16-17-18------19-20-21-22-23-24-+
 | X           O  O |   | O  X  O  X     X |
 | X           O  O |   | O  X  O  X       |
 |             O    |   | O     O          |
 |                  |   | O                |
 |                  |   |                  |
 |                  |BAR|                  |
 |                  |   |                  |
 |                  |   |                  |
 |             X    |   | X                |
 | O           X    |   | X  X             |
 | O           X    |   | X  X           O |
 +12-11-10--9--8--7-------6--5--4--3--2--1-+
Pip count  X: 186  O: 124 X-O: 0-0
Cube: 1
X to play 21

I'd try the pure priming play of 8/7 6/4. An alternative idea would
be to step up with 24/22, in order to be able to escape a back checker
with a 6, but I don't think we need to do that yet. That straggler is
giving us shot possibilities and is not in immediate danger of being
attacked. If we're hit, we could make a third anchor, which would be
helpful.

---
Tim Chow

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)

62 pips of timing is marginal for a viable backgame, but the principles
of mobility and pure play still hold for positions like this.

I was more concerned about mobility, so I played 24/22 and then the
chicken play of 6/5. A better play would involve both mobility and pure
play, i.e. slotting either the 7 or the 4 after 24/22, with the four
being clearly better. Interestingly, a play that accomplishes neither,
8/5, comes out better in the rollout than my play.

The bot massively favors the pure pure play, which is to slot both the 7
and the four.

I'm at a loss to provide a variant here. XGID=-a---BC-C---bB---cbdBcB-A-:0:0:1:21:0:0:0:0:10

X:Player 1 O:Player 2
Score is X:0 O:0. Unlimited Game
+13-14-15-16-17-18------19-20-21-22-23-24-+
| X O O | | O X O X X |
| X O O | | O X O X |
| O | | O O |
| | | O |
| | | |
| |BAR| |
| | | |
| | | |
| X | | X |
| O X | | X X |
| O X | | X X O |
+12-11-10--9--8--7-------6--5--4--3--2--1-+
Pip count X: 186 O: 124 X-O: 0-0
Cube: 1
X to play 21

1. Rollout¹ 8/7 6/4 eq:-0.253
Player: 48.50% (G:9.69% B:0.39%)
Opponent: 51.50% (G:26.94% B:1.09%)
Confidence: ±0.020 (-0.273..-0.233) - [100.0%]
Duration: 10 minutes 38 seconds

2. Rollout¹ 24/23 6/4 eq:-0.333 (-0.081)
Player: 45.85% (G:8.82% B:0.36%)
Opponent: 54.15% (G:24.81% B:0.81%)
Confidence: ±0.017 (-0.351..-0.316) - [0.0%]
Duration: 10 minutes 12 seconds

3. Rollout¹ 8/5 eq:-0.375 (-0.122)
Player: 43.75% (G:8.71% B:0.36%)
Opponent: 56.25% (G:22.21% B:0.70%)
Confidence: ±0.016 (-0.391..-0.359) - [0.0%]
Duration: 9 minutes 17 seconds

4. Rollout¹ 24/22 6/5 eq:-0.397 (-0.145)
Player: 42.82% (G:8.01% B:0.33%)
Opponent: 57.18% (G:21.28% B:0.46%)
Confidence: ±0.017 (-0.414..-0.381) - [0.0%]
Duration: 10 minutes 17 seconds

5. Rollout¹ 24/22 8/7 eq:-0.403 (-0.151)
Player: 44.43% (G:8.20% B:0.34%)
Opponent: 55.57% (G:25.62% B:0.60%)
Confidence: ±0.015 (-0.419..-0.388) - [0.0%]
Duration: 9 minutes 57 seconds


¹ 1296 Games rolled with Variance Reduction.
Moves: 3-ply, cube decisions: XG Roller


eXtreme Gammon Version: 2.10

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)

On Friday, July 7, 2023 at 8:10:59 AM UTC-4, Timothy Chow wrote:

On 7/6/2023 10:56 PM, ah....Clem wrote:

This came up in match play, but I don't think the score mattered so recasting it as unlimited without Jacoby.

Pure play? Mobility? Hybrid? Something else?

XGID=-a---BC-C---bB---cbdBcB-A-:0:0:1:21:0:0:0:0:10

X:Player 1 O:Player 2
Score is X:0 O:0. Unlimited Game
+13-14-15-16-17-18------19-20-21-22-23-24-+
| X O O | | O X O X X |
| X O O | | O X O X |
| O | | O O |
| | | O |
| | | |
| |BAR| |
| | | |
| | | |
| X | | X |
| O X | | X X |
| O X | | X X O |
+12-11-10--9--8--7-------6--5--4--3--2--1-+
Pip count X: 186 O: 124 X-O: 0-0
Cube: 1
X to play 21

I'd try the pure priming play of 8/7 6/4. An alternative idea would
be to step up with 24/22, in order to be able to escape a back checker
with a 6, but I don't think we need to do that yet. That straggler is
giving us shot possibilities and is not in immediate danger of being attacked. If we're hit, we could make a third anchor, which would be helpful.

---
Tim Chow

We don't leave the checker on the 24pt there because it's giving us shot possibilities. We leave it there because stepping up to the 22pt still doesn't do a great job of allowing us to escape. If we had rolled a four for example that's not [42 22]
obviously, we step up to the 20pt without hesitation.

Stick

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)