[Retros] Two little SPG-challenges

[Ryan M.]

Hashimoto's problem can be found on PDB (P1013070).

r1b1kbnr/pp1ppppp/R1p3n1/1B6/2K2B2/1N2P1P1/PPP1PP1P/NQ4 w - - 0 1
PG in 24.0 moves

1.g3 Nc6 2.Bg2 Ne5 3.Bc6 Ng6 4.Bb5 c6 5.Nf3 Qb6 6.Nd4 Kd8 7.Nb3 Qe3
8.dxe3 Kc7 9.Bd2 Kd6 10.Bc3+ Ke6 11.Qd6+ Kf5 12.N1d2 Kg4 13.Rd1 Kh3
14.Na1 Kg2 15.Ndb3 Kxh1 16.Rd4 Kg2 17.Ra4 Kh3 18.Ra6 Kg4 19.Qd1 Kf5
20.Kd2 Ke6 21.Kd3 Kd6 22.Kc4+ Kc7 23.Be5+ Kd8 24.Bf4 Ke8

18-move bK circuit.

-Ryan M.

-----Original Message-----
From: retros-admin at janko.at [mailto:retros-admin at janko.at] On Behalf Of
Joost de Heer
Sent: Monday, November 15, 2004 5:35 AM
To: retros at janko.at
Subject: Re: [Retros] Two little SPG-challenges



> In the final position of an SPG one king is occupying it's 

> original square.

> 

> Construct an SPG (with a unique solution), where this king 

> has made as many moves as possible.


There is a Hashimoto composition, published in Problemesis, where the
black king captures a rook on h1, and then goes back. His roundtrip is
about 24 moves long, if I'm not mistaken.

I don't have the position available atm, but perhaps someone else can
post it.

Joost
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