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Some thoughts about retrograde backgammon

Posted By: Bob Koca
Date: Thursday, 12 June 2014, at 1:56 a.m.

In Response To: Some thoughts about retrograde backgammon (Timothy Chow)

I have a rules question about those chess problems. For example the first one says

"15+15. Proof game in exactly 4.0 moves"

What does 15 + 15 mean?

Messages In This Thread

• Some thoughts about retrograde backgammon
  Timothy Chow -- Thursday, 12 June 2014, at 12:55 a.m.
  • Some thoughts about retrograde backgammon
    Stick -- Thursday, 12 June 2014, at 1:31 a.m.
  • Some thoughts about retrograde backgammon
    Robert Chow -- Thursday, 12 June 2014, at 1:51 a.m.
  • Some thoughts about retrograde backgammon
    Bob Koca -- Thursday, 12 June 2014, at 1:56 a.m.
  • Some thoughts about retrograde backgammon
    Bob Koca -- Thursday, 12 June 2014, at 2:05 a.m.
  • Some thoughts about retrograde backgammon
    Bob Koca -- Thursday, 12 June 2014, at 2:12 a.m.
    • Spoiler
      Nack Ballard -- Thursday, 12 June 2014, at 4:37 a.m.
    • Some thoughts about retrograde backgammon
      Robert Chow -- Thursday, 12 June 2014, at 5:05 a.m.
      • Some thoughts about retrograde backgammon
        Timothy Chow -- Friday, 13 June 2014, at 5:29 p.m.
        • Some thoughts about retrograde backgammon
          Bob Koca -- Friday, 13 June 2014, at 5:42 p.m.
        • Some thoughts about retrograde backgammon
          Robert Chow -- Friday, 13 June 2014, at 7:16 p.m.
          • Some thoughts about retrograde backgammon
            Nack Ballard -- Friday, 13 June 2014, at 9:59 p.m.
            • Some thoughts about retrograde backgammon
              Robert Chow -- Friday, 13 June 2014, at 11:26 p.m.
        • Some thoughts about retrograde backgammon
          Nack Ballard -- Friday, 13 June 2014, at 9:51 p.m.
  • Some thoughts about retrograde backgammon
    Nack Ballard -- Thursday, 12 June 2014, at 5:36 a.m.
  • Some thoughts about retrograde backgammon
    Timothy Chow -- Thursday, 12 June 2014, at 3:21 p.m.
    • Some thoughts about retrograde backgammon
      Nack Ballard -- Friday, 13 June 2014, at 5:06 a.m.
      • Some thoughts about retrograde backgammon
        Timothy Chow -- Friday, 13 June 2014, at 5:39 p.m.
  • Some thoughts about retrograde backgammon
    Stein Kulseth -- Sunday, 15 June 2014, at 9:22 p.m.
    • Some thoughts about retrograde backgammon
      Nack Ballard -- Monday, 16 June 2014, at 3:47 a.m.
      • Some thoughts about retrograde backgammon
        Stein Kulseth -- Monday, 16 June 2014, at 12:35 p.m.
        • Some thoughts about retrograde backgammon
          Stein Kulseth -- Monday, 16 June 2014, at 1:02 p.m.
          • Some thoughts about retrograde backgammon
            Nack Ballard -- Monday, 16 June 2014, at 3:24 p.m.
            • Some thoughts about retrograde backgammon
              Stein Kulseth -- Monday, 16 June 2014, at 7:40 p.m.
    • Solutions
      Stein Kulseth -- Sunday, 22 June 2014, at 12:15 p.m.