[Retros] Fake castling speed record

[Francois Labelle]

On 09/23/2012 06:18 AM, Andrew Buchanan wrote:

> 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?


I have access! :) I only have a complete database up to 5.0 moves, 
though. In that database, I found 192 PGs in 5.0 moves with fake black 
king-side castling, and nothing else. The PGs are the following:

1. Nf3 f5 2. Ne5 Nf6 3. Nxd7 Kf7 4. Nxf8 Rxf8 5. [19 choices] Kg8
1. b3/b4 f5 2. Bb2 Kf7 3. Bxg7 Nf6 4. Bxf8 Rxf8 5. [18 choices] Kg8
1. d3/d4 Nh6 2. Bxh6 f5/f6 3. Bxg7 Kf7 4. Bxf8 Rxf8 5. [23 or 24 
choices] Kg8
1. d3/d4 f5 2. Bg5 Kf7 3. Bxe7 Nf6 4. Bxf8 Rxf8 5. [21 or 22 choices] Kg8

(The number of choices depends on whether 1.d3 or 1.d4 was played.)

     Francois


>

> 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)"]

>

> _______________________________________________

> Retros mailing list

> Retros at janko.at

> http://www.pairlist.net/mailman/listinfo/retros