h1

Solution Position 8

November 29, 2009

 

Hi,
here is the Solution for Pos 8, later today i will upload the Video Matchequitey Part 1.
Here is a link if you want to learn the Rules of Backgammon http://www.gammonvillage.com/backgammon/magazine/backgammon_rules.cfm





is Player 2

score: 0
pip: 139

Money session
Jacoby
pip: 146
score: 0

is Player 1

XGID=a-ABB-C—bB-Bb–cbbBc–A-:1:-1:1:53:0:0:1:0:10
to play 53

eXtreme Gammon Version: 1.10

Overview
Black owns a 2 Cube, so White doesnt have any access to it. White is behind in the Race with 7 pips before this Roll, after this Roll its almost even. White has the stronger Board 3 vs 2 Pt-Board, but he has a Blot on 2 Point. Black is on the Bar with one Checker. White has a Holding Game with his 5-PT-Anchor, but he has 3 Runners Back, Black one, which is on the Bar.
Blacks Gameplan is to bring his last Runner Home and hoping to clear his outfield Points without leaving any shoots. White Gameplan is more difficult, cause Black is on the Bar. White would love to play here a Blitz, but he doesnt have enough Attackers close to the Board, so in short term  he needs Builders and Attackers to improve his Board, and specially here he needs to cover the Blot on his 2 Point. If thinks go bad for White, he should try in long term to play a Holding Game.

13/8 6/3





is Player 2

score: 0
pip: 139

Money session
Jacoby
pip: 138
score: 0

is Player 1

XGID=a-ACB-B-A-bB-Ab–cbbBc–A-:1:-1:1:-5-3:0:0:1:0:10
to play -5-3

eXtreme Gammon Version: 1.10

This is the try to bring an extra Builder close to the Board to cover the 2 Point or maybe if White Rolls very well to make the 5 Point. At first view this move doesnt look bad, but it has some disadvantages. First it leaves 4 Blots around, which gives Black also some double hit Rolls, like 2-6, 2-3 and single hits with any 2 and 1-3, 5-3. 1-1. Second, White is loosing his Midpoint, which is much more bad than leaving the Blots. The Midpoint controlls White´s outfield and is controlling Black´s 10-Point here, and it keeps White armee connected, its like a bridge. Once when Black has entered, and White doesnt have the Midpoint, it will be easy for Black to clear his 10 Point here, Black will shift over very soon a very strong redouble to 4. Specially here, cause White doesnt have made his 5 Point, and doesnt have enough Builders for it close to it. White wont be the favourite to contain Blacks last Runner, it will be easy for Black when he enters on the 5 Point to bring around his last Runner and clearing his 10 Point here, when White doesnt have his Midpoint to control his outfield.
We can close out this move, cause it gives up the Midpoint and hence loosing control of the outfield.

13/8 11/8





is Player 2

score: 0
pip: 139

Money session
Jacoby
pip: 138
score: 0

is Player 1

XGID=a-ABB-C-B-bA-Ab–cbbBc–A-:1:-1:1:-5-3:0:0:1:0:10
to play -5-3

eXtreme Gammon Version: 1.10

This move is a little bit better, cause it makes a Blocking Pt on the 8 Point but this is only a good Blocking Point, when Black enters on the 2 Point. White has the same amount of rolls for making his 5 Pt or covering his 2 Pt. This play also leaves 4 Blots.
We can close out this move for the same reasons like the last one.

13/5





is Player 2

score: 0
pip: 139

Money session
Jacoby
pip: 138
score: 0

is Player 1

XGID=a-ABBAC—bB-Ab–cbbBc–A-:1:-1:1:-5-3:0:0:1:0:10
to play -5-3

eXtreme Gammon Version: 1.10

Slotting the 5 Point looks nice, cause of the lack of Builders, It will be hard for White to make the 5 Point naturally. But again White is loosing his Midpoint, hence control and connection. And of course White is leaving 22 hits here.
We can close out this one for the same reasons above.

11/8 11/6

 

 





is Player 2

score: 0
pip: 139

Money session
Jacoby
pip: 138
score: 0

is Player 1

XGID=a-ABB-D-A-b–Bb–cbbBc–A-:1:-1:1:-5-3:0:0:1:0:10
to play -5-3

eXtreme Gammon Version: 1.10

This move leaves less Blots, but Black has now less Rolls to make his 5 Point. If Black enters on the 5 Point the 11 Point is a nice Block and it controlls very well the 5 Point and it serves also as Attackers or Builders for the 5 Point. Giving up the 11 Point is also not good, cause White looses again controll like in the moves before. So we can close it out.

20/12





is Player 2

score: 0
pip: 139

Money session
Jacoby
pip: 138
score: 0

is Player 1

XGID=a-ABB-C—bBABb–cbbAc–A-:1:-1:1:-5-3:0:0:1:0:10
to play -5-3

eXtreme Gammon Version: 1.10

First of all this play leaves 4 Blots, like most of the moves we have analysed so far. There is also a nice duplication of 2´s. But most important is that White still has a nice controll of the board, and his armee stay connected. What makes us afraid about this move is that White is loosing his 5 Pt- Anchor, which looks very dangerous. How dangerous is it for White to leave his Anchor?. First of all Black is on the Bar, so White can take now some higher Risks to improve his Position, he has a nice Temp Gain here. Even if Black rehits here, White has the chance to remake the 5 Point. White has the stronger Board, so he is not realy afraid about a hit contest, even with the Blot on the 2 Point. All other Alternatives we have discussed are much more dangerous in the long run, than this Move here, caue White controlls all areas of the Board, thats why this is the best Move. Also to consider is that White already gave away the Cube, usually its right to play more aggressive then.

Rollout





is Player 2

score: 0
pip: 139

Money session
Jacoby
pip: 146
score: 0

is Player 1

XGID=a-ABB-C—bB-Bb–cbbBc–A-:1:-1:1:53:0:0:1:0:10
to play 53

1. Rollout1 20/12 eq: -0,381
Player:
Opponent:
43,54% (G:17,14% B:0,85%)
56,46% (G:19,58% B:2,03%)
Conf: ± 0,025 (-0,406…-0,356)
Duration: 41 minutes 09 seconds
2. Rollout1 11/8 11/6 eq: -0,427 (-0,046)
Player:
Opponent:
40,94% (G:12,34% B:0,45%)
59,06% (G:12,90% B:0,80%)
Conf: ± 0,028 (-0,455…-0,399)
Duration: 41 minutes 41 seconds
3. Rollout1 13/5 eq: -0,448 (-0,066)
Player:
Opponent:
41,48% (G:13,62% B:0,58%)
58,52% (G:16,49% B:1,31%)
Conf: ± 0,036 (-0,484…-0,412)
Duration: 42 minutes 48 seconds
4. Rollout1 13/8 11/8 eq: -0,450 (-0,068)
Player:
Opponent:
40,92% (G:13,62% B:0,58%)
59,08% (G:15,71% B:1,23%)
Conf: ± 0,029 (-0,479…-0,421)
Duration: 38 minutes 12 seconds
5. Rollout1 13/8 6/3 eq: -0,455 (-0,074)
Player:
Opponent:
40,81% (G:13,01% B:0,44%)
59,19% (G:14,89% B:1,00%)
Conf: ± 0,024 (-0,479…-0,431)
Duration: 38 minutes 28 seconds
 
1 648 Games rolled with Variance Reduction.
Moves: 3 ply, cube decisions: 1 ply
Search interval: Huge

eXtreme Gammon Version: 1.10

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