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53P-41S-66B-31?

Posted By: Nack Ballard
Date: Wednesday, 11 May 2011, at 10:14 p.m.

In Response To: 53P-41S-66B-31? (Ian Shaw)

    53P-41S-66B-31 [P-688 c56 E63] gnubg 2ply rollout, 5k
    53P-41S-66B-31 [P-671 c27 E39] gnubg 0ply rollout, 5k*4.5
    53P-41S-66B-31 [P-668 c24 E47] gnubg 2ply eval

Thanks for the nacbracs. They greatly ease comparison.

For reference, I would write the set of nacbracs as shown below. I don't typically include the absolute equities (in red here), but I like the way you incorporated them (either before or after the P works).

    53P-41S-66B-31
    [-688 P c56 E63] /5
    [-671 P c27 E39] /5*4 (0-ply)
    [-668 P c24 E47] /e

The symbol for GnuBG is a slash (/), with 2-ply assumed unless otherwise stated. For evaluation, just use "e."

We used to use "k" for thousands but now it is implied. You used the asterisk correctly as a repeater (i.e., "5*4" means 5k for the first two plays, and 4k for the third and any subsequent play). The 4 (i.e., 4k) represents some number of trials between 4000 and 4999. If you write 4.5 it means 4500 to 4599 trials but we usually don't bother (one can expect to refer to the actual rollout for the exact number of trials).

In case you wanted to include the fourth and fifth plays, they can be nactated D (Down, 13/9) and C (Cross, 24/23 9/6).

The desirability of an advanced anchor once the opponent has one led me to consider 23/20 9/8, but this is -0.27 behind on the rollout.

B (Both, 23/20 9/8) is not a play shown in either of your rollouts. Perhaps I misunderstand.

Nack

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