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Rollout: 53P-54S-52S-52K-61H-53D-64H-21?

Posted By: Timothy Chow
Date: Sunday, 15 August 2010, at 12:58 a.m.

In Response To: 53P-54S-52S-52K-61H-53D-64H-21? (Timothy Chow)

This one really should be rolled out more than 2592 times, but I think it's clear that slotting is the right idea. OTB I played bar/23 6/5 and did not consider bar/24 6/4. It seemed too strange to slot a weaker point and make the 1-anchor and 5-anchor, which don't play all that well together. However, as others have pointed out, bar/23 6/5 does have the disadvantage of being rather loose. Bar/24 6/4 tops the rollout and even if a longer rollout pushes bar/23 6/5 on top, bar/24 6/4 is surely at least very close.

By the way, I've been experimenting with using GNU 3-ply instead of GNU 2-ply for first-pass checker-play analysis of my games, and so far have not been too impressed. I know that Depreli's bot comparison says that 3-ply is slightly better than 2-ply for checker play, but anecdotally I have not noticed much improvement. For example, in this position, GNU 3-ply plays bar/23 24/23 and puts bar/23 6/5 in 3rd place, 0.053 back, while GNU 2-ply plays bar/24 6/4 and puts bar/23 6/5 in 2nd place, 0.023 back.

gnubg	145
tchow	182
Position ID: jOfgCSDgc3DAUA Match ID: cAkFAAAAAAAA

#		Ply	Move	Equity
•	1	R	bar/24 6/4	-0.316
			0.434 0.100 0.004 - 0.566 0.193 0.014 -0.235 -0.316 0.001 0.001 0.000 - 0.001 0.002 0.001 0.004 0.010
			Full cubeful rollout with var.redn.
			2592 games, Mersenne Twister dice gen. with seed 897039052 and quasi-random dice
			Play: supremo 2-ply cubeful prune [world class]
			keep the first 0 0-ply moves and up to 16 more moves within equity 0.32
			Skip pruning for 1-ply moves.
			Cube: 2-ply cubeful prune [world class]
	2	R	bar/23 6/5	-0.335 ( -0.019)
			0.431 0.100 0.004 - 0.569 0.210 0.010 -0.253 -0.335 0.001 0.001 0.000 - 0.001 0.001 0.001 0.004 0.009
			Full cubeful rollout with var.redn.
			2592 games, Mersenne Twister dice gen. with seed 897039052 and quasi-random dice
			Play: supremo 2-ply cubeful prune [world class]
			keep the first 0 0-ply moves and up to 16 more moves within equity 0.32
			Skip pruning for 1-ply moves.
			Cube: 2-ply cubeful prune [world class]
	3	R	bar/23 24/23	-0.364 ( -0.048)
			0.415 0.095 0.003 - 0.585 0.171 0.008 -0.249 -0.364 0.001 0.001 0.000 - 0.001 0.001 0.001 0.004 0.009
			Full cubeful rollout with var.redn.
			2592 games, Mersenne Twister dice gen. with seed 897039052 and quasi-random dice
			Play: supremo 2-ply cubeful prune [world class]
			keep the first 0 0-ply moves and up to 16 more moves within equity 0.32
			Skip pruning for 1-ply moves.
			Cube: 2-ply cubeful prune [world class]

Messages In This Thread

• 53P-54S-52S-52K-61H-53D-64H-21?
  Timothy Chow -- Friday, 13 August 2010, at 10:21 p.m.
  • 53P-54S-52S-52K-61H-53D-64H-21?
    Leonardo Jerkovic -- Friday, 13 August 2010, at 11:39 p.m.
  • 53P-54S-52S-52K-61H-53D-64H-21?
    Paul Weaver -- Saturday, 14 August 2010, at 12:51 a.m.
  • 53P-54S-52S-52K-61H-53D-64H-21?
    Casper van der Tak -- Saturday, 14 August 2010, at 7:24 a.m.
  • 53P-54S-52S-52K-61H-53D-64H-21?
    Nack Ballard -- Saturday, 14 August 2010, at 10:30 a.m.
  • Rollout: 53P-54S-52S-52K-61H-53D-64H-21?
    Timothy Chow -- Sunday, 15 August 2010, at 12:58 a.m.
  • Paul Weaver's rollout
    Timothy Chow -- Sunday, 15 August 2010, at 11:07 p.m.