[Retros] At Home SPGs, and more

Joost de Heer ildjarn666 at linuxmail.org
Wed Jan 28 07:58:14 EST 2004

> I don't know: my program doesn't give me the solutions, and I'm not very

> good at solving SPGs! So please find the two solutions by hand (it should

> be fun) and check if they're independent enough.

Only one acceptable double-solution proofgame in both 8 and 9 halfmoves:

SPG 4.0 (2 solutions)

1. d4 Nc6 2. Bf4 Nd4 3. Bc7 Nc6 4. Bb8 Nb8
1. d4 c5 2. Bh6 cd4 3. Qd4 Nh6 4. Qd1 Ng8

These two solutions are distinct enough to be acceptable. A pity is the repeated first move.

SPG 4.5 (2 solutions)

1. d4 Nc6 2. Bc4 Nd4 3. Bc7 Qc7 4. Qd4 Qd8 5. Qd1
1. d4 c5 2. Bf4 cd4 3. Bb8 Rb8 4. Qd4 Ra8 5. Qd1

These two are somewhat interesting, because there are two different black switchbacks, but the play is too repetetive to be 'publishable'.

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