Hold your nerve

Unlimited Games. Should Red double? If doubled, should White take?
eXtreme Gammon ID: XGID=--CBcBC--B--aa---bBbbbAb--:0:0:1:00:0:0:3:0:10

Answer and Commentary

At first sight this looks to be a crushing double. Red has twenty-eight numbers to hit a White blot. He already leads by twenty-two pips in the race and there is a very real gammon threat.

The truth is very different. This is a double but only just and the take is trivial. Why is that?

  • White has a strong home board so a hit will be very powerful. Fifty percent of the time White will enter next turn after a hit by Red. 
  • White’s anchor is a powerful asset which provides equity until the end of the game. 
  • Red’s blot on White’s 3-pt is still a liability rather than an asset. 
  • Red has a dilly builder on the 2-pt. It would be much better placed on Red’s 5-pt.
  • On Red’s eight misses White has a very playable position.

Not doubling as Red is an error but dropping as White is a quadruple, blunder.

I hope you will agree that this is a very instructive problem.

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This turned out be closer than I thought. Red must split the back checkers while White only has nine checkers in the zone. The only two sensible contenders are 24/16 and 24/22, 13/7.

The reason for posting this problem is to introduce Robertie’s Addition Method to those who don’t know it.

Everybody should know that in a pure three-roll ending (one where both players