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running play

Posted By: Daniel Murphy
Date: Tuesday, 29 May 2012, at 2:32 p.m.

In Response To: running play (steve)

Opp has 12 checkers left -- 6 rolls. After your play you need 9 crossovers to get off the gammon. Staying gains a roll in the gammon race whenever it forces Opp to take off 1 checker instead of 2, or 2 instead of 4, or 3 instead of 4. So staying gains on 8/36 rolls and loses on none.

11 - you lose four pips (half a roll), but this leaves you needing 10 crossovers instead of 9 to get off the gammon. Either way, you need 5 rolls. Meanwhile Opp takes off 2 checkers not 4, leaving him with 10 checkers instead of 8.

What happens if you fan? That's not bad. If Opp takes off 2 checkers you need 10 crossovers and Opp has 8 checkers left, so you're no worse off than if you had played 21/18 (you'd have needed 9 crossovers vs. 8 checkers left). But you gain another roll when Opp rolls 21 31 41 51 61 32 42 52 62 since Opp can take off only 1 checker with you on the bar. So you gain or break even if you respond to 11 with a fan -- unless you fan a second time.

12 13 23 - Opp takes off 1 checker not 2.

22 - Opp takes off 3 checkers not 4.

14 15 16 24 25 26 33 34 35 36 44 45 46 55 56 66 - No difference

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