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52S-51S-31P-42P-32 — Index to Rollouts
Posted By: Taper_Mike In Response To: 501 Essential Backgammon Problems #45 -- Rollout + Variants (Igor)
Date: Thursday, 29 August 2013, at 10:41 p.m.
52S-51S-31P-42P-32 Position ID: mOfgASiw5+ABJA Match ID: 8IlJAAAACAAE Attacking the Blots
Thanks, Igor, for keeping these problems coming. Your analyses and variants are spot on.I would have missed this one. Because 54, 44, and 22 are blocked, bringing a checker down from the midpoint risks only 7 shots. The resulting builder on the 10pt works to make both the 4pt and the bar point. That seemed a fair balance of risk and reward.
The gammon-go result suggests why “crossing” the bar with C = 24/22 8/5 does so well. Unlike S = Z = 24/22 13/10, C brings a builder within direct range of the opponent’s blots. The stripped 8pt provides what Magriel termed a semi-active builder. When POH is possible, the 8pt is expendable.
For later searching, here is a list of the obvious move sequences that lead to the position of Problem 45.
- 31P-42P-52S-51S-32
- 31P-51S-52S-42P-32
- 52S-42P-31P-51S-32
- 52S-51S-31P-42P-32
Mike
52S-51S-31P-42P-32 — Unlimited Games Bot Seed Equity Nacbracs Link XG 2.10 3-ply, Cubes: XGR 94782038 +174 j[C S14] "<=20 Igor Erovenko GnuBg 0.xx 2-ply Trunc 725028711 +148.030 n[C S15] /0.360t Taper_Mike XG 2.10 XGR++ Eval [XGR++ seed] +178.9 n[C S21] "&e Taper_Mike
52S-51S-31P-42P-32 — Double Match Point Bot Seed Equity Nacbracs Link XG 2.10 3-ply, Cubes: XGR 94782038 +67 d[S C4] "<=15 Igor Erovenko
52S-51S-31P-42P-32 — Gammon Go Bot Seed Equity Nacbracs Link XG 2.10 3-ply, Cubes: XGR 94782038 +408 g[C S7] "<=10 Igor Erovenko
52S-51S-31P-42P-32 — Gammon Save Bot Seed Equity Nacbracs Link XG 2.10 3-ply, Cubes: XGR 94782038 –143 s[C S2] "<=20 Igor Erovenko Key: C = Cross [24/22, 8/5], S = Split = Z = Reverse split [24/22, 13/10]
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