53P-41S-66B-31?

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53P-41S-66B-31?

Posted By: Ian Shaw
Date: Wednesday, 11 May 2011, at 4:32 p.m.

In Response To: 53P-41S-66B-31? (Ian Shaw)

Everyone got this right, but I nearly blundered over the board.
Making the five point is obviously reasonable, but other themes caught my eye.
The desirability of an advanced anchor once the opponent has one led me to consider 23/20 9/8, but this is -0.27 behind on the rollout.
Building in front of rather behind the anchor made me think of the 13/9, which also prevents White hitting me. Then I realised that a White hit would offer me plenty of return shots and White would lose the anchor. This reduced my concern.
There is a long way to go in this game, so I correctly made the long-term asset of the five point.
I didn't really consider anchoring on the 23 point, which is a point I dislike. It has the values of anchoring when White has 10 men in the zone, and furthermore it threatens White's stripped 8 point, which would be useful builders for the double gap in her board. E (Each, 24/23 6/3) is narrowly behind c (cross, 24/23 8/5) but a longer rollout would be needed for confidence.
This is another early-game position, so I've posted rollouts for 5k trials at both 0-ply and 2-ply, to see how they compare. The 0-ply rollout isn't far off form the 2-ply evaluation, but the two-ply rollout worsens Blue's position for each of the top three plays.
53P-41S-66B-31 [P-688 c56 E63] gnubg 2ply rollout, 5k
53P-41S-66B-31 [P-671 c27 E39] gnubg 0ply rollout, 5k*4.5
53P-41S-66B-31 [P-668 c24 E47] gnubg 2ply eval
(I always have to check Nack's key for which symbol refers to which bot, so I've written that part longhand.)
135

53P-41S-66B-31 162
Position ID: jLfBwQDgc+EBKA Match ID: cIkFAAAAAAAA

# Ply Move Equity

• 1 R 8/5 6/5 -0.6879

0.3462 0.0792 0.0030 - 0.6538 0.2416 0.0096 -0.4766 -0.6879

0.0009 0.0007 0.0002 - 0.0009 0.0011 0.0003 0.0022 0.0064

Full cubeful rollout with var.redn.

5185 games, Mersenne Twister dice gen. with seed 887431363 and quasi-random dice

Stop when best play is enough JSDs ahead: limit 3 (min. 1296 games)

Play: world class 2-ply cubeful prune [world class]

keep the first 0 0-ply moves and up to 8 more moves within equity 0.16

Skip pruning for 1-ply moves.

Cube: 2-ply cubeful prune [world class]

2 R 24/23 8/5 -0.7443 ( -0.0564)

0.3164 0.0637 0.0024 - 0.6836 0.1566 0.0081 -0.4660 -0.7443

0.0008 0.0006 0.0001 - 0.0008 0.0010 0.0003 0.0021 0.0056

Full cubeful rollout with var.redn.

5184 games, Mersenne Twister dice gen. with seed 887431363 and quasi-random dice

Stop when best play is enough JSDs ahead: limit 3 (min. 1296 games)

Play: world class 2-ply cubeful prune [world class]

keep the first 0 0-ply moves and up to 8 more moves within equity 0.16

Skip pruning for 1-ply moves.

Cube: 2-ply cubeful prune [world class]

3 R 24/23 6/3 -0.7505 ( -0.0626)

0.3154 0.0610 0.0021 - 0.6846 0.1596 0.0082 -0.4738 -0.7505

0.0009 0.0006 0.0001 - 0.0009 0.0010 0.0005 0.0025 0.0067

Full cubeful rollout with var.redn.

5185 games, Mersenne Twister dice gen. with seed 887431363 and quasi-random dice

Stop when best play is enough JSDs ahead: limit 3 (min. 1296 games)

Play: world class 2-ply cubeful prune [world class]

keep the first 0 0-ply moves and up to 8 more moves within equity 0.16

Skip pruning for 1-ply moves.

Cube: 2-ply cubeful prune [world class]

4 R 13/9 -0.7993 ( -0.1114)

0.3238 0.0623 0.0024 - 0.6762 0.2254 0.0059 -0.5189 -0.7993

0.0019 0.0012 0.0003 - 0.0019 0.0019 0.0006 0.0050 0.0143

Full cubeful rollout with var.redn.

1300 games, Mersenne Twister dice gen. with seed 887431363 and quasi-random dice

Stop when best play is enough JSDs ahead: limit 3 (min. 1296 games)

Play: 0-ply cubeful [expert]

Cube: 0-ply cubeful [expert]

5 R 24/23 9/6 -0.8028 ( -0.1148)

0.2967 0.0542 0.0018 - 0.7033 0.1343 0.0052 -0.4900 -0.8028

0.0007 0.0006 0.0001 - 0.0007 0.0009 0.0002 0.0018 0.0046

Full cubeful rollout with var.redn.

5185 games, Mersenne Twister dice gen. with seed 887431363 and quasi-random dice

Play: world class 2-ply cubeful prune [world class]

keep the first 0 0-ply moves and up to 8 more moves within equity 0.16

Skip pruning for 1-ply moves.

Cube: 2-ply cubeful prune [world class]

# Ply Move Equity

• 1 R 8/5 6/5 -0.6706

0.3501 0.0788 0.0036 - 0.6499 0.2370 0.0089 -0.4633 -0.6706

0.0010 0.0007 0.0002 - 0.0010 0.0010 0.0004 0.0027 0.0079

Full cubeful rollout with var.redn.

5185 games, Mersenne Twister dice gen. with seed 887431363 and quasi-random dice

Play: 0-ply cubeful [expert]

Cube: 0-ply cubeful [expert]

2 R 24/23 8/5 -0.6973 ( -0.0267)

0.3188 0.0628 0.0019 - 0.6812 0.1592 0.0083 -0.4652 -0.6973

0.0010 0.0006 0.0001 - 0.0010 0.0010 0.0004 0.0027 0.0081

Full cubeful rollout with var.redn.

5185 games, Mersenne Twister dice gen. with seed 887431363 and quasi-random dice

Play: 0-ply cubeful [expert]

Cube: 0-ply cubeful [expert]

3 R 24/23 6/3 -0.7096 ( -0.0389)

0.3173 0.0610 0.0023 - 0.6827 0.1598 0.0081 -0.4699 -0.7096

0.0011 0.0006 0.0002 - 0.0011 0.0011 0.0005 0.0030 0.0087

Full cubeful rollout with var.redn.

4658 games, Mersenne Twister dice gen. with seed 887431363 and quasi-random dice

Play: 0-ply cubeful [expert]

Cube: 0-ply cubeful [expert]

4 R 24/23 9/6 -0.7349 ( -0.0643)

0.3046 0.0566 0.0021 - 0.6954 0.1421 0.0058 -0.4801 -0.7349

0.0016 0.0010 0.0003 - 0.0016 0.0016 0.0005 0.0042 0.0127

Full cubeful rollout with var.redn.

1772 games, Mersenne Twister dice gen. with seed 887431363 and quasi-random dice

Play: 0-ply cubeful [expert]

Cube: 0-ply cubeful [expert]

5 R 13/9 -0.7993 ( -0.1287)

0.3238 0.0623 0.0024 - 0.6762 0.2254 0.0059 -0.5189 -0.7993

0.0019 0.0012 0.0003 - 0.0019 0.0019 0.0006 0.0050 0.0143

Full cubeful rollout with var.redn.

1300 games, Mersenne Twister dice gen. with seed 887431363 and quasi-random dice

Play: 0-ply cubeful [expert]

Cube: 0-ply cubeful [expert]

	135

53P-41S-66B-31	162
Position ID: `jLfBwQDgc+EBKA` Match ID: `cIkFAAAAAAAA`

Messages In This Thread

53P-41S-66B-31?
Ian Shaw -- Tuesday, 10 May 2011, at 3:42 p.m.
- 53P-41S-66B-31?
  neilkaz -- Tuesday, 10 May 2011, at 5:17 p.m.
- 53P-41S-66B-31?
  John O'Hagan -- Wednesday, 11 May 2011, at 3:30 a.m.
- 53P-41S-66B-31?
  Timothy Chow -- Wednesday, 11 May 2011, at 3:53 a.m.
- 53P-41S-66B-31?
  Nack Ballard -- Wednesday, 11 May 2011, at 8:17 a.m.
  - 53P-41S-66B-31?
    Mr Majestyk -- Wednesday, 11 May 2011, at 12:47 p.m.
    - 53P-41S-66B-31?
      Nack Ballard -- Wednesday, 11 May 2011, at 3:20 p.m.
- 53P-41S-66B-31?
  Ian Shaw -- Wednesday, 11 May 2011, at 4:32 p.m.
  - 53P-41S-66B-31?
    Nack Ballard -- Wednesday, 11 May 2011, at 10:14 p.m.
    - 53P-41S-66B-31?
      Ian Shaw -- Thursday, 12 May 2011, at 9:30 a.m.
      - Equities in nacbracs, bot symbols
        Nack Ballard -- Friday, 13 May 2011, at 5:05 p.m.
- Nactations of 53P-41S-66B-31 — May 2012 Update
  Taper_Mike -- Friday, 4 May 2012, at 8:56 a.m.

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