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Rollout: An old Senkiewicz-Tardieu position

Posted By: Timothy Chow
Date: Tuesday, 16 March 2010, at 11:03 p.m.

In Response To: An old Senkiewicz-Tardieu position (Timothy Chow)

Of all the plays in the Senk-Tardieu match, this was the play on which Storer disagreed with Snowie most strongly. Tardieu played 13/7, and Storer approved, but Snowie dissented. The GNU rollout below sides with Snowie (g11 MET).

I don't pretend to understand this complicated position fully, but I would think that the fact that Blue hits with all 36 rolls after 13/7 is relevant. The tempo gain by hitting is quite valuable in this position since White is a lot more inflexible than Blue is. The 8-point does have strategic value but White is being a little optimistic if he thinks he can just strengthen this position with strategic moves without tactical blows. White must think tactically here; even if the bots are wrong and 13/7 turns out to be right, my guess is that it's likely to be for tactical reasons rather than strategic ones.

gnubg	176
tchow	185
Position ID: mHMwoCngM2MwSA Match ID: MAGrADAAAAAA

• gnubg moves bar/23 8/2*

#		Ply	Move	Equity
•	1	R	bar/23 8/2*	-0.573
			0.423 0.165 0.013 - 0.577 0.203 0.010 -0.455 -0.573 0.001 0.003 0.001 - 0.001 0.001 0.001 0.004 0.009
			Full cubeful rollout with var.redn.
			5184 games, Mersenne Twister dice gen. with seed 850647563 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 13/7	-0.612 ( -0.039)
			0.410 0.142 0.014 - 0.590 0.196 0.010 -0.472 -0.612 0.001 0.003 0.001 - 0.001 0.002 0.001 0.005 0.011
			Full cubeful rollout with var.redn.
			5184 games, Mersenne Twister dice gen. with seed 850647563 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

• An old Senkiewicz-Tardieu position
  Timothy Chow -- Monday, 15 March 2010, at 4:29 p.m.
  • An old Senkiewicz-Tardieu position
    Chase -- Monday, 15 March 2010, at 5:11 p.m.
  • Rollout: An old Senkiewicz-Tardieu position
    Timothy Chow -- Tuesday, 16 March 2010, at 11:03 p.m.
    • Rollout: An old Senkiewicz-Tardieu position
      Chase -- Wednesday, 17 March 2010, at 12:00 a.m.
      • Rollout: An old Senkiewicz-Tardieu position
        Timothy Chow -- Wednesday, 17 March 2010, at 1:00 a.m.