[Retros] Fake castling speed record

[Andrew Buchanan]

Gianni's 5.5 can be flipped to get a sound 5.0.
http://www.janko.at/Retros/d.php?ff=rnbq1rk1/ppppp2p/5n2/5p2/1P6/8/P1PPPPPP/
RN1QKBNR
SPG 5.0 C+ Euclide

But doesn't Joost have access to the complete database of all possible short
SPGs produced by Francois Labelle? Can't he speedily identify what the
record holders must be in this tiny area?

Thanks,
Andrew.

-----Original Message-----
From: retros-bounces at janko.at [mailto:retros-bounces at janko.at] On Behalf Of
Pascal Wassong
Sent: 23 September 2012 20:56
To: The Retrograde Analysis Mailing List
Subject: Re: [Retros] Fake castling speed record

Hello,

I think that there are many variations (not checked with a computer):
1.e4 c6 2.Ba6 Qb6 3.Ne2 Qxf2+ 4.Kxf2 b6 5.Rf1 Bb7 6.Kg1

Pascal



>>>>> "Gianni" == Gianni Donati <Gianchess at aol.com> writes:


    Gianni> Hi Joost - I'm guessing your 5.5-move game goes like this:
    Gianni> 1. f4 b6 2. Kf2 Bb7 3. Qe1 Bxg2 4. Nf3 Bxf1 5. Rxf1 b5
    Gianni> 6. Kg1, with the only possible variant being 1...b5 and then
    Gianni> choice of any Black move #5.

    Gianni> Can it be proved that there is no 4.5 game?
 
    Gianni> Best,
 
    Gianni> Gianni
 
    Gianni>  _______________________________________________ Retros
    Gianni> mailing list Retros at janko.at
    Gianni> http://www.pairlist.net/mailman/listinfo/retros


On 23-9-2012 10:44, Joost de Heer wrote:

> Hello,

>

> Does anyone know what the current fastest 'fake castling' record is? I 

> can find a Gruber proofgame from Schach-Echo 1978 in which the fake 

> castling is completed after 6.5 moves.

>

> I found a 5.5 moves proofgame with fake castling yesterday, but it's 

> so ugly that it probably isn't worth publishing.


This is on the kingside. For the queenside I've found a 6.5 moves one.
Joost

["My hobby: restoring email threads that other respondents have truncated

:o)"]