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Prime-versus-Prime, Challenge #4

Posted By: Casper Van der Tak
Date: Saturday, 25 April 2015, at 8:26 a.m.

In Response To: Prime-versus-Prime, Challenge #4 (Nack Ballard)

Great problem as always.

DMP: This ought to be make a 6-prime and split. 11/9 12/8 24/22. 6-primes are tremendously strong, and a good way to win the game. You will not win that many gammons, and may lose a few gammons yourself, so that is why you'd look for other plays at the other scores.

GG: Put two on the roof and split: 24/22 7/3*/1*. This ought to win the most gammons by far, but also loses the most gammons. For the escape of the back checkers, 2s and 6s work at the moment, and we have quite a bit of time to blitz and escape. The hitting escaping 6 is also strong.

GS: Time to anchor up high 24/22(2)and then find two more 2s. 12/8 makes a 5 prime and slots for the 6th point, but leaves a direct number; 11/9 8/6 makes a broken 5 prime, and leaves no direct shots, and 5/3(2)* leaves no directs, but a few indirects and a lot of blots, and temporarily breaks the prime, while also making it difficult for white to extend the prime. I probably would play pure, 24/22(2) 12/8, but not very sure, 24/22(2) 11/9 8/6 also looks strong. 5/3*(2) looks wrong at GS.

Money: this is the most difficult for me. I think OTB I'd make the same play as at DMP, but I can imagine that 24/22(2) 5/3*(2) is best, because it seems to trade some wins for a good combination of net gammons, and maybe Jacoby does its magic on some adverse sequences.

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