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62

Posted By: Timothy Chow
Date: Monday, 26 October 2009, at 2:32 p.m.

In Response To: 62 (misja)

I studied a couple of similar positions recently and found that the benefits of putting the checker on the bar and making a fourth point are quite significant. For a start, large doubles are automatically blocked. Also, the four-point board gives Blue more time to get his act together and build the structure he wants, both right now, and perhaps later, if White partially escapes but gets hit by Blue again.

In addition, in this position, White's other blot is significant. If Blue plays 8/2* 4/2 and White rolls 35 from the bar, hitting, then Blue gets a shot at a second White checker, so White really has no immediate jokers. If he gets the chance, Blue might even want to slot some of his vacant homeboard points in order to force White to hit as White comes in, giving Blue a chance to pick up the second checker.

For comparison, here's a money-game position where one has to choose between pointing and priming, and pointing comes out ahead. It's not exactly parallel to the original position but I think it's still a useful point of reference.

gnubg	37
tchow	139
Position ID: 7gAACKNtRYAwAA Match ID: UYkQAAAAAAAA

#		Ply	Move	Equity
•	1	R	7/3* 4/3	-0.410
			0.386 0.000 0.000 - 0.614 0.300 0.061 -0.590 -0.410 0.002 0.000 0.000 - 0.002 0.002 0.001 0.005 0.008
			Full cubeful rollout with var.redn.
			1296 games, Mersenne Twister dice gen. with seed 865386797 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	12/8 4/3*	-0.465 ( -0.055)
			0.368 0.000 0.000 - 0.632 0.321 0.054 -0.639 -0.465 0.002 0.000 0.000 - 0.002 0.002 0.001 0.006 0.008
			Full cubeful rollout with var.redn.
			1296 games, Mersenne Twister dice gen. with seed 865386797 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

• 62
  misja -- Sunday, 25 October 2009, at 7:44 p.m.
  • 62
    Rich Munitz -- Sunday, 25 October 2009, at 8:19 p.m.
    • 62
      rory -- Monday, 26 October 2009, at 4:01 a.m.
      • 62
        Rich Munitz -- Monday, 26 October 2009, at 4:51 a.m.
        • 62
          rory -- Monday, 26 October 2009, at 5:06 a.m.
  • 62
    Daniel Murphy -- Sunday, 25 October 2009, at 10:47 p.m.
  • 62
    David -- Monday, 26 October 2009, at 1:40 a.m.
  • 62
    neilkaz -- Monday, 26 October 2009, at 3:06 a.m.
  • 62
    Christian Munk-Christensen -- Monday, 26 October 2009, at 7:52 a.m.
  • 62
    Timothy Chow -- Monday, 26 October 2009, at 2:32 p.m.
    • 62
      Keene -- Monday, 26 October 2009, at 9:03 p.m.
  • 62
    Chuck Bower -- Monday, 26 October 2009, at 5:18 p.m.
  • Rollout
    misja -- Monday, 26 October 2009, at 9:45 p.m.
    • Rollout from XG
      neilkaz -- Tuesday, 27 October 2009, at 3:25 a.m.