by Jake Jacobs
12 March 2013
Article text Copyright © 1999-2015 Jake Jacobs and GammonVillage Inc.
Great problems, Jake. In problem 3, what do you mean exactly by, "If Black's acepoint were slotted, instead of closed"? Do you mean if *White's* acepoint were slotted?
I played with some of these positions in XG. In problem 1, XGR+ version 1 prefers 13/10 6/4*. How far back is that play in your rollout? In problem 4, I found that if we weaken White's board, for example taking two checkers from her 3pt and putting one each on her 4pt and 5pt, then 13/8 floats to the top.
In #3 I'm sure that's what he meant. The difference in plays when White's acepoint is slotted instead of made though is small, ~.005. The difference in plays when it is made, the original problem, is ~.015.
As for #1 Jake is on crack. XG2 prefers on all major levels the play you mentioned, 10, 4*. A rollout confirms that it is the best play.
As for #4 of course if you leave the inner board blotted paying now would become correct the same as if you made it only a 2pt board spanning a 4 prime from the 8pt to the 5pt it would be right to pay now. As the problem is presented though we can almost always leave those indirects later at the same cost if needed while we buy time for our opponent to perhaps slot the next point in line or we roll something better. Classic pay now/pay later problem.
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