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Great position pair (but spoiler)

Posted By: Nack Ballard
Date: Saturday, 1 May 2010, at 8:46 a.m.

In Response To: early 21 to play (Bob Koca)

From opening position move one of your checkers back from 13 to 16. Now you have 21 to play. What is your play? Do you go back to opening setup?

I'd be surprised if 13/11 6/5, duplicating 4s, is not the right play. It might even be right if White owns her 5pt.

I am reminded of one of my favorite pair of third roll positions:

43Z-31P-51

32S-31P-51

In the left-hand position, Blue should not slot. (As I recall, 21/16 9/8 is best, and 21/15 is second best, and none of the top five plays slot.) Blue duplicates his own 4s. (However, Blue should slot anyway if the position is 32S-65R-51, where White does not own her 5pt.)

In the right-hand position, Blue should slot with 21/16 6/5 and it is hugely correct. This play gives him good 6s, 5s and 2s to cover a point or hit back.

With that knowledge, look at your 13pt-to-16pt adjusted opening position (shown below), and it will be clear why I thought slotting (13/11 6/5) with 21 seems so clear.

Modified opening position: Blue to play 21

I wonder what puzzle you're working on. ;)

Nack

Messages In This Thread

• early 21 to play
  Bob Koca -- Saturday, 1 May 2010, at 7:03 a.m.
  • early 21 to play
    Casper van der Tak -- Saturday, 1 May 2010, at 7:13 a.m.
  • Great position pair (but spoiler)
    Nack Ballard -- Saturday, 1 May 2010, at 8:46 a.m.
    • 43Z-31P-51 and 32S-31P-51
      Nack Ballard -- Sunday, 5 August 2012, at 4:45 a.m.
  • early 21 to play
    neilkaz -- Saturday, 1 May 2010, at 2:26 p.m.
  • early 21 to play RO
    Bob Koca -- Monday, 3 May 2010, at 3:55 a.m.