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Rollout: Which points do I want?

Posted By: Timothy Chow
Date: Saturday, 7 August 2010, at 5:49 p.m.

In Response To: Which points do I want? (Timothy Chow)

I was in doubt so I made the 5 point. I was prepared to be told it was wrong but I was startled just how wrong GNU thought it was. While I don't fully trust GNU 4-ply here, I give a 4-ply evaluation of a variant position below to show that only a "small" change to the position is needed to make the decision much closer.

---

gnubg	121
tchow	160
Position ID: uJ0NNACYz2AwDA Match ID: UYkNAAAAAAAA

#		Ply	Move	Equity
•	1	R	13/10*(2) 6/3(2)	-0.102
			0.394 0.117 0.005 - 0.606 0.161 0.006 -0.257 -0.102 0.002 0.002 0.000 - 0.002 0.002 0.000 0.004 0.006
			Full cubeful rollout with var.redn.
			1296 games, Mersenne Twister dice gen. with seed 897138117 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	13/10*/7 6/3(2)	-0.172 ( -0.071)
			0.384 0.108 0.005 - 0.616 0.192 0.008 -0.321 -0.172 0.002 0.002 0.000 - 0.002 0.002 0.001 0.005 0.007
			Full cubeful rollout with var.redn.
			1296 games, Mersenne Twister dice gen. with seed 897138117 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	13/10*(2) 8/5(2)	-0.234 ( -0.133)
			0.351 0.092 0.004 - 0.649 0.155 0.006 -0.363 -0.234 0.002 0.001 0.000 - 0.002 0.002 0.001 0.004 0.006
			Full cubeful rollout with var.redn.
			1296 games, Mersenne Twister dice gen. with seed 897138117 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]

---

GNU 4-ply evaluation of variant:

gnubg	121
tchow	162
Position ID: uJ0NNACY52AwDA Match ID: UYkNAAAAAAAA

#		Ply	Move	Equity
	1	4	13/10*(2) 6/3(2)	-0.092
			0.405 0.114 0.003 - 0.595 0.149 0.007
	2	4	13/10*(2) 8/5(2)	-0.105 ( -0.013)
			0.400 0.115 0.002 - 0.600 0.152 0.007

Messages In This Thread

• Which points do I want?
  Timothy Chow -- Friday, 6 August 2010, at 1:14 a.m.
  • Which points do I want?
    Seth -- Friday, 6 August 2010, at 2:09 a.m.
    • Which points do I want?
      Leonardo Jerkovic -- Friday, 6 August 2010, at 2:57 a.m.
      • Which points do I want?
        Dmitriy Obukhov -- Friday, 6 August 2010, at 3:47 a.m.
  • Which points do I want?
    John O'Hagan -- Friday, 6 August 2010, at 2:28 a.m.
  • Which points do I want?
    Marv Porten -- Friday, 6 August 2010, at 6:25 a.m.
  • Which points do I want?
    Casper van der Tak -- Friday, 6 August 2010, at 6:58 a.m.
  • Which points do I want?
    Christian Munk-Christensen -- Friday, 6 August 2010, at 7:06 a.m.
  • Which points do I want?
    Gregg Cattanach -- Friday, 6 August 2010, at 1:15 p.m.
  • Which points do I want?
    misja -- Friday, 6 August 2010, at 2:20 p.m.
  • Which points do I want?
    neilkaz -- Friday, 6 August 2010, at 3:53 p.m.
  • Rollout: Which points do I want?
    Timothy Chow -- Saturday, 7 August 2010, at 5:49 p.m.