[Retros] shortest proofgames of castling switchback

[andrew buchanan]

hi hirokaz,

I posted a 7.5 move k-side invisible castling without promotion on this
mailing list a couple of years ago:

1.e3 d6 2.Bb5 Qd7 3.Ne2 Qxb5 4.0-0 Qxe2 5.f3 Qxd1 6.Kf2 Qxc1 7.Rh1 Qe1
8.Kxe1

cheers,
andrew.


--- Hirokaz ONODA <glkoon at yahoo.co.jp> wrote:


> Hi,

> 

> Thank you, Mario and Joost.

> 

> So we have this for the shortest PG for castling switchback.

> 1.e4 f5 2.Bc4 f4 3.Ne2 f3 4.0-0 fxe2 5.f3 e1=R 6.Kf2 Re3 7.Rh1 Rd3

> 8.Ke1

> (Joost de Heer, 2005)

> 

> Without promotion:

> 1.c4 e6 2.Qa4 Ba3 3.c5 Nh6 4.Qh4 0-0 5.Qxd8 f6 6.Qxc8 Kf7 7.Qxb8 Rh8

> 8.Qxa7

> Ke8 (Andrew Buchanan, 2005)  

> 

> Captureless: vacant

> 

> Q-side castling switchback: vacant

> cf.(after O-O-O, K returns, but R does not):

> 1.d4 c5 2.Bh6 cxd4 3.Qxd4 Nxh6 4.Nd2 Nf5 5.0-0-0 Nxd4 6.Re1 Nxc2

> 7.Kd1 Nxe1

> 8.Kxe1 (Christoph Fieberg, 2005)

> 

> Castling switchback for both sides: 

> r1bnk2r/pp1p2pp/2n2p2/2bQp3/4Pr2/5PR1/PP1P2PP/RNB1K2R

> SPG 19.0 14+15 C+

> (Andrei Frolkin 2nd Prize Die Schwalbe 1990)

> 

> Amici Sumus,

> Hiro

> 

> 

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