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BGonline.org Forums
Gotta break your 6 prime.
Posted By: playBunny In Response To: Gotta break your 6 prime. (Dmitriy Obukhov)
Date: Wednesday, 10 April 2013, at 9:17 a.m.
66 comparing with 55 gains 4 pips
"It's not the size, it's what you do with it". ;-)
The opponent gains from the player having played 8/7 instead of putting a piece inside the home and also gets to clear his midpoint with the 66, which wouldn't be the case with the 55.
With 55, the half-crossovers are 9 for the opponent versus 8 for player. With 66, it's 7 for the opponent and 9 for the player. That's a +1 lead converted to a -2 deficit.
Is it right away so obvious to everyone, except me, that breaking 8 pt HAS GOT TO BE inferior?
"Clear from the rear" is a good guideline when safety is important but flexibility of attackers is one factor that can weigh against it.
When there are opportunities for attack it's often better to break a point that puts more men inside the home, increasing the number of attackers. You can see the difference below.
Rolls that close the 2-point after 8/7 8/5
8 1 2 3 4 5 6 1 2, 3, 4 3 4 5 6 7 2 3 4, 6, 8 5 6 7 8 3 4 5 6, 9, 12 7 8 9 4 5 6 7 8, 12, 16 9 10 5 6 7 8 9 10,15,20 11 6 7 8 9 10 11 12,18,24 8 / 36 = 22.2% 28 / 36 = 77.8%
Rolls that close the 2-point after 7/6 7/4
15 1 2 3 4 5 6 1 2, 3, 4 3 4 5 6 7 2 3 4, 6, 8 5 6 7 8 3 4 5 6, 9, 12 7 8 9 4 5 6 7 8, 12, 16 9 10 5 6 7 8 9 10,15,20 11 6 7 8 9 10 11 12,18,24 15 / 36 = 41.7%21 / 36 = 58.3%CommentsThere is almost twice the number of opportunities after breaking the 7-point.
These numbers, 8 closes with three attackers and 15 closes with four attackers are close to the approximation closes = attackers ^ 2, which is handy to bear in mind.
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