[Retros] rights & ocassions /answering Andrew

Wed May 14 16:26:47 EDT 2014

Guus,

> "...we are left with the question on how to harmonize the original FIDE
concept with the addition of automatic draws in the world of composition -
still not considering castlings at all. I would suggest that to "continue
to ignore possible terminations" is most in line with the FIDE concept.
Yes, some repetitions do  change options for the players but so does the
original FIDE law in real chess games..."

This issue has already been harmonized, by the implicit presumption that
such repetition is not inherent in the diagram, unless it can be proved by
retrograde analysis.
Several retro composers have even attempted to make good use of this
presumption (most notably in studies wherein the solver must make use of
this to either draw, or avoid draw); unfortunately, I can provide no good
example (the concept is obviously very difficult to achieve, which might
explain my having no recollection of an entirely successful rendition).

Perhaps I am misunderstanding you, because I would have expected that this
presumption was inherently obvious (otherwise, it would cast suspicion upon
almost every #2 composition).

Kevin.

On Wed, May 14, 2014 at 12:30 PM, Guus Rol <grol33 at gmail.com> wrote:

> Starting with a puzzle followed by an introduction, the solution and an
> explanation.
>
> Make the followiing changes from PAS (initial game array): Remove Nb8,
> move Pe2 to e4, move Bf1 to h5 and  Ng8 to f6. This is an SPG in 4.0 moves
> but it is not unique. How many legal  forward moves do you need to play
> forward at least to make sure that the first 4 moves in the game are unique
> (then)?
>
> This puzzle shows many different aspects of the issues discussed. It also
> adds a new one: retro-logics. Whenever you do anything in retro-solving
> which moves both froward and backward in time, you need a supporting
> retro-logic, either implicitly or explicitly. The interaction between the
> FIDE laws and the retro-logics is more complex than between the Laws and
> the basic retro-conventions. Naturally,since the conventions are
> required input for the logics to function besides other concepts.
>
> Note: I hope to discuss some other day why I think that retro-logics and
> conventions should be separated. It doesn't matter for the current story
> that you subscribe to that view or not.
>
> One of the things the solution shows are the two different relationships
> between repetition and castling:
> 1. The dependency relationship dictated by the laws and conventions.
> Repetition may be dependent on castling right but not in reverse.
> 2. The (retro-)logical relationship between repetition and castling right.
> Here the choice of forward moves may decide on either a past with (loss of)
> castling rights or a drawing repetition. The context is usually one of
> retro-strategic logic.
>
> You can imagine that combining a retro-logic for trying to decide missing
> information from the past with a dynamic chess Law trying to look into an
> uncertain future from that past, at times produces quirky results. And so,
> besides solving the puzzle, I wil make a detour into Jumanji with the idea
> of "dynamic castling rights".
>
> Solution to the puzzle:
>
> Play forward: 5. Be2 Ng8 6. Bh5 Nf6 7. Be2 Ng8 The next white moves are
> not unique, the blacks are e.g. 8.Nc3 Rb8 9.Nb1 Ra8.
> By convention, the new position is not a draw unless a repetition draw can
> be proved. Such is not the case and we therefore have no draw here. From
> that information you can derive only 1 proof game without
> drawing repetitions: 1. Pe4 Na6 2. Bxa6 Nf6 3. Be2 Rg8 4. Bh5 Rh8. You can
> see that the eighth and ninth black move Rb8 and Ra8 demonstrate the type-1
> relationship (castling rights must have been lost there) and 7...Ng8 shows
> the type-2 relationship. Before that move, black could have had both
> castling rights, after it, one was lost. This shows the common paradoxical
> scene of losing castling right without ever moving King or Rook. Well, what
> you really lost, was just a "past". Happens all the time in retro-chess!
>
> Now to Jumanji. Suppose move 8 and 9 were not played in that game. Notice
> that before 7...Ng8 black had both future castling rights and after it he
> lost 1 - not to say which but that doesn't matter. Lets now play 8. Bh5 Nf6
> again reaching the same position for the 3rd time. According to the "future
> castling law", the position is not the same as the previous times when
> there were still both future castling rights/occasions. In reality, by
> standard proof game assessment, the position is an unnegotiable draw at
> this point. Welcome to the Zoo!
>
> Explanation. The confusion comes from mixing retro-strategy and
> retro-analysis. Whenever the term "future" is used one reaches - almost
> unconciously - for what seems the appropriate retro-logic. Since there is
> no framework for handling repetitions in prA or retro-variants one resorts
> to the natural choice that is always available - retro strategy. But
> retro-strategy can eliminate roads into the past and thereby narrow down
> your (retro) options. Static definitions only refer to past proof games and
> need not take data from an ambiguous future. In this case, the proper
> retro-analyst arrives at the same conclusion Valery did in his example: a
> castling right was already lost by move 4 in all remaining proof games - as
> seen in retrospect after move 9.
>
> Well, I never said it is impossible to operate on dynamic rights, only
> that it requires an I.Q. of 280 plus a winning lottery ticket. Proves that
> you can manage the future.
>
> Guus Rol..
>
>
>
>
>
> On Wed, May 14, 2014 at 6:47 PM, Guus Rol <grol33 at gmail.com> wrote:
>
>> Hi Joost and Valery,
>>
>> The way I see it there is a pre-issue to the discussion. The FIDE-laws do
>> not know of any automatic draws. Even in the simple case without past or
>> future "castling rights", FIDE must have considered that "possible moves"
>> would not change across 50M boundaries or repetitions within repetition
>> cycles. None of those enforce draws or close gateways even when the options
>> for the players do change - i.e. the right to claim. Chess players
>> though, are keenly aware of the risks in repeating positions. You might say
>> that when the board looks the same for the FIDE laws, it looks quite
>> different for the players. Example: Ke4-e5-e6-e5-e4 (mimicked by the
>> opponent) not only switches back but also spoils the game if Ke5 is now the
>> only move to win it!
>>
>> Which means that we are left with the question on how to harmonize the
>> original FIDE concept with the addition of automatic draws in the world of
>> composition - still not considering castlings at all. I would suggest that
>> to "continue to ignore possible terminations" is most in line with the FIDE
>> concept. Yes, some repetitions do  change options for the players but so
>> does the original FIDE law in real chess games - see example above. In
>> fact, by down-playing the relevance of future developments in the
>> conversion from play to composition, we also take the first step towards a
>> static view on repetitions altogether. Do we need more then to justify the
>> application of static castling rights in repetitions as well?
>>
>> Guus Rol
>>
>>
>>
>>
>> On Wed, May 14, 2014 at 4:59 PM, Retros Probleemblad <
>> retro at probleemblad.nl> wrote:
>>
>>> On 05/14/2014 03:50 PM, Valery Liskovets wrote:
>>>
>>>> Joost,
>>>>
>>>> In my example, looking in the past, we have enough time for 4
>>>> repetitions.
>>>> But are they (more exactly, should the Rules be such that they are) all
>>>> identical in both twins? I see no way to pose this question via a
>>>> problem
>>>> with an ordinary stipulation (unless I overlook anything). As far as I
>>>> know
>>>> Nikita Plaksin has never discussed this (modern, future-depending)
>>>> collision:
>>>> is castling _practically_ executable or not? And his corresponding
>>>> problems
>>>> didn't depend on such nuances of the 3-rep. rule. But maybe any of them
>>>> can be reinterpreted in such framework?
>>>>
>>>
>>> Valeri,
>>>
>>> Although the question is different, the underlying theme is the same: Is
>>> castling allowed if it can be proven that, by castling (or in your case: by
>>> making it possible to castle), more than 100 single moves without capture,
>>> pawn move or castling have occurred?
>>>
>>> Your example could be changed to something even more extreme by the way:
>>> Ke1 Rh1 Sa1 // Ke8 Ph2
>>> No captures/pawn moves for 46 full moves. How many times can the
>>> sequence Sb3 Ke7 Sa1 Ke8 be repeated until there is a correct claim for
>>> 3-fold repetition.
>>>
>>> Can white really lose his castling rights by moving a piece besides the
>>> rook and king?
>>>
>>> Joost
>>>
>>> _______________________________________________
>>> Retros mailing list
>>> Retros at janko.at
>>> http://www.pairlist.net/mailman/listinfo/retros
>>>
>>
>>
>
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