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Rollout: Part 2: Which points do I want?

Posted By: Timothy Chow
Date: Sunday, 8 August 2010, at 10:37 p.m.

In Response To: Part 2: Which points do I want? (Timothy Chow)

Here 18/14(2) is clear but I wasn't sure about 14/10(2) versus 13/9(2). I ended up playing 13/9(2), which the rollout says is right by a lot. I think a significant part of the reason is that the point 6 away from the anchor is particularly difficult to clear. If we give White the 5-point anchor instead then the decision looks much closer.

---

gnubg	160
tchow	148
Position ID: oufgACPg2+DBAA Match ID: cAkSAJAAAAAA

#		Ply	Move	Equity
•	1	R	18/14(2) 13/9(2)	+0.759
			0.702 0.099 0.004 - 0.298 0.056 0.001 +0.449 +0.759 0.002 0.002 0.000 - 0.002 0.001 0.000 0.004 0.010
			Full cubeful rollout with var.redn.
			1296 games, Mersenne Twister dice gen. with seed 897280231 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	18/10(2)	+0.687 ( -0.072)
			0.686 0.094 0.003 - 0.314 0.060 0.001 +0.408 +0.687 0.001 0.002 0.000 - 0.001 0.001 0.000 0.004 0.008
			Full cubeful rollout with var.redn.
			1296 games, Mersenne Twister dice gen. with seed 897280231 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	158
tchow	148
Position ID: oufggCHg2+DBAA Match ID: cAkSAJAAAAAA

#		Ply	Move	Equity
	1	4	18/10(2)	+0.530
			0.666 0.088 0.002 - 0.334 0.066 0.001
	2	4	18/14(2) 13/9(2)	+0.526 ( -0.004)
			0.662 0.095 0.003 - 0.338 0.070 0.001

Messages In This Thread

• Part 2: Which points do I want?
  Timothy Chow -- Saturday, 7 August 2010, at 6:55 p.m.
  • Part 2: Which points do I want?
    christian munk-christensen -- Saturday, 7 August 2010, at 8:08 p.m.
    • Part 2: Which points do I want?
      Casper van der Tak -- Saturday, 7 August 2010, at 9:10 p.m.
  • Part 2: Which points do I want?
    Stick -- Saturday, 7 August 2010, at 9:28 p.m.
  • Part 2: Which points do I want?
    neilkaz -- Saturday, 7 August 2010, at 9:53 p.m.
  • Rollout: Part 2: Which points do I want?
    Timothy Chow -- Sunday, 8 August 2010, at 10:37 p.m.
    • Rollout: Part 2: Which points do I want?
      christian munk-christensen -- Monday, 9 August 2010, at 4:07 p.m.
    • Rollout: Part 2: Which points do I want?
      Casper van der Tak -- Monday, 9 August 2010, at 4:12 p.m.
    • Rollout of variant position
      Timothy Chow -- Thursday, 12 August 2010, at 2:43 a.m.