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 Post subject: Bill Spight's Go Theory Research
Post #1 Posted: Sun Dec 26, 2021 12:44 am 
Judan

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Webpage: http://home.snafu.de/jasiek/GoTheoryRes ... ill_Spight
Abbreviations: http://home.snafu.de/jasiek/GoTheoryRes ... reviations


Preface


Bill Spight's teaching of go theory, especially endgame theory, and minor inventions are not listed. He may have done further research I am not aware of. His real name is William L. Spight.

The research is by Bill Spight unless other names are stated. Two or more names without attributes are listed in decreasing order of contribution. Names separated by a slash indicate equal contribution. Besides his ground-breaking structural insight, bold font denotes his most important contribution to the advance of go theory.


Endgame


Theorems

- Generalised thermography allowing complex and multiple kos [IGTD] [p] [Bill Spight, Elwyn Berlekamp, Martin Müller et al]

- Timing in a neutral threat environment and dependency on Fibonacci numbers [IGT] [p]

- Equivalence of conditions (gote / sente count versus gote / follow-up move value versus sente / follow-up move value versus gote / sente move value) of local endgame with one simple follow-up [IGT] [*m] [proofs Robert Jasiek, conjectures Bill Spight]

- Non-existence of local double sente [IGT] [*m] [Francisco Criado, Robert Jasiek, Bill Spight]

- Equivalence of conditions (gote / sente count versus gote / sente move value) of local endgame with a player's simple gote and sente options [IGT] [*m] [proofs Robert Jasiek, conjectures Bill Spight]

- Method of comparing the opponent's branches, 3-move traversal, evaluation due to reversal [IGT] [*m] [Bill Spight, Robert Jasiek]

- Timing during the late endgame at low temperature of the creator playing in a local endgame with one follow-up in an environment [IGT] [*m] [Bill Spight, Robert Jasiek]

- Method of comparing two sequences combined with the method of comparing counts during the late endgame in a local endgame with one follow-up in an environment [IGT] [*m] [Robert Jasiek, Bill Spight]

- Method of comparing two sequences combined with the method of comparing net profits during the late endgame in a local endgame with one follow-up in an environment [IGT] [*m] [Robert Jasiek, Bill Spight]

- Method of comparing three sequences combined with the method of comparing counts during the late endgame of the creator playing in a local endgame with gote and sente options in an environment [IGT] [*m] [Robert Jasiek, Bill Spight]

- Timing during the late endgame at low temperature of the creator playing in a local endgame with gote and sente options in an environment [IGT] [*m] [Bill Spight, Robert Jasiek]

- Timing during the early endgame at low temperature of the creator playing in a local endgame with gote and sente options in an environment [IGT] [*m]

- Creator starting in the larger local endgame with one follow-up [IGT] [*m] [Robert Jasiek, Bill Spight]

- Preventer starting in the larger local endgame with one follow-up [IGT] [*m] [Robert Jasiek, Bill Spight]

- Additional details for playing in the larger local endgame with one follow-up [IGT] [*m] [Bill Spight, Robert Jasiek]


Other Theory

- Neutral threat environment [ICGD] [pm] [Elwyn Berlekamp / Bill Spight]

- Continued research in temperature theory [G] [pm]

- 'Ambiguous' local endgame (hybrid of local gote and sente) [ICGD] [m]

- Local endgames with gote and sente options require their own evaluation. [G] [m]

- Preliminary theory of evaluating sequences [G] [m]

- Comparison of gote versus sente strategies in multiples [C] [m]

- Clarification of gain [CGW] [m]

- Translation of theory on unconnected reductions of corridors [IGT] [pm] [theorem + proof: David Wolfe, translation: Bill Spight]

- First examples of a few rare cases [I] [m]

- Doubly ambiguous shapes [W] [m] [Bill Spight / Robert Jasiek]

- Verify types of local endgames to determine their correct values. [IGT] [*m] [Robert Jasiek / Bill Spight]

- Fast evaluation of long sequences by the method of comparing the opponent's branches [IG] [*] [Bill Spight, Robert Jasiek et al]

- Do not always play in decreasing order of move values but use better theory. [IGT] [*m] [Robert Jasiek, Bill Spight]

- Interrupt local sequences in time. [IGT] [*m] [Robert Jasiek / Bill Spight]

- Strategy depends on the local endgame / ensemble, the environment, its temperature and sometimes its second-largest value. [IGT] [*m] [Robert Jasiek / Bill Spight]

- Use of the sente move value for the timing during the late endgame of playing in a local gote. [IGT] [*m]

- Application to strategy and positional judgement during the middle game [IGT] [*m] [Bill Spight, Robert Jasiek]

- Earliest and latest moments of playing in a local endgame in sente or reverse sente depending on the enironment [IGT] [*m] [Bill Spight, Robert Jasiek]

- Translation of relevant combinatorial game theory (including low-level theory and corridors) to go theory. [IGT] [*m] [Robert Jasiek, Bill Spight et al]

- Types (local gote, local sente, ambiguous of a local endgame with one simple follow-up. [ID] [m]

- Test sequences for a local endgame with one follow-up in an environment [ID] [*m] [Bill Spight, Robert Jasiek]

- Test sequences for the creator starting in a local endgame with gote and sente options in an environment [ID] [*m] [Bill Spight, Robert Jasiek]


Ko


- Correct play in multiple n-tuple kos [IGT] [m] [Bill Spight / James Davies / John Rickard]

- Komonster [ICGD] [m]

- Primary, secondary, tertiary ko threats [ICG] [m]


Rules


- Spight Rules [I] [m]

- Pass stones (aka book-keeping stones) [ICG] [p]

- Research in button go [C] [m]

- A type of superko rules [I] [m]


This post by RobertJasiek was liked by 3 people: dhu163, gowan, Knotwilg
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 Post subject: Re: Bill Spight's Go Theory Research
Post #2 Posted: Mon Jan 03, 2022 1:29 pm 
Lives in gote

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I would be interested in more details and references as SL only has a few. I'm not sure many more exist though.

We have this page -
https://senseis.xmp.net/?BillSpight

and I saw Bill mentioned writing a book on evaluation somewhere. Has this happened, or did it go into L19+RJ's books?

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 Post subject: Re: Bill Spight's Go Theory Research
Post #3 Posted: Tue Jan 18, 2022 11:40 pm 
Judan

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See https://www.lifein19x19.com/viewtopic.php?f=17&t=18576 for my reply.

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