[Retros] one man PGs

[Göran Wicklund]

A slight modification will add one move:

+---+---+---+---+---+---+---+---+
|*N |*N |*B |*Q |*K |*B |*N |*R |
+---+---+---+---+---+---+---+---+
|*P |   |*P |*P |*P |*P |*P |*P |
+---+---+---+---+---+---+---+---+
|   | R |   | . |   | . |   | . |
+---+---+---+---+---+---+---+---+
| B |   | . | P | . |   | . | K |
+---+---+---+---+---+---+---+---+
|   | . | P | R |   | P | P | . |
+---+---+---+---+---+---+---+---+
| . |   | . |   | . |   | . |   |
+---+---+---+---+---+---+---+---+
| B | . |   | N | P | . | B | . |
+---+---+---+---+---+---+---+---+
| . |   | . |   | . |   | . |   |
+---+---+---+---+---+---+---+---+
SPG 23.5 C+

1.d4 b6 2.Bd2 b5 3.Ba5 b4 4.Nd2 b3 5.Rb1 bxa2 6.b4 a1=N
7.b5 Nb3 8.b6 Nc5 9.b7 Ne4 10.bxa8=B Nef6 11.Bd5 Ng4
12.Ba2 Nxh2 13.d5 Ng4 14.Rh4 Ne3 15.Rd4 Nxd1 16.f4 Nf2
17.g4 Nh3 18.Bg2 Nxg1 19.Kf2 Nf3 20.Kg3 Ne5 21.Kh4 Nc4
22.Kh5 Nb6 23.c4 Na8 24.Rb6

/Göran


-----Original Message-----
From: Retros [mailto:retros-bounces at janko.at] On Behalf Of Nicolas Dupont
Sent: 25 May 2016 05:12
To: The Retrograde Analysis Mailing List; Noam Elkies
Cc: retros at janko.at
Subject: Re: [Retros] one man PGs

Quoting Noam Elkies <elkies at math.harvard.edu<mailto:elkies at math.harvard.edu>>:

> There's also this approach to the one-sided aspect of this task:
>
> http://www.janko.at/Retros/d.php?ff=rnbqkbBr/Rpppp1pp/P3R1q1/K6Q/1P1P4/4BN2/2P4P/3N4
>
> SPG-22.0 (C-)

The "classic" approach leads to the following sound 22.5 PG:

1. Pd2-d4   Pb7-b6     2. Fc1-d2   Pb6-b5     3. Fd2-a5   Pb5-b4
  4. Cb1-d2   Pb4-b3     5. Ta1-b1   Pb3xa2     6. Pb2-b4   Pa2-a1=C
  7. Pb4-b5   Ca1-b3     8. Pb5-b6   Cb3-c5     9. Pb6-b7   Cc5-e4
10. Pb7xa8=F Ce4-f6    11. Fa8-d5   Cf6-g4    12. Fd5-a2   Cg4xh2
13. Pd4-d5   Ch2-g4    14. Th1-h4   Cg4-e3    15. Th4-c4   Ce3xd1
16. Pf2-f4   Cd1-f2    17. Pg2-g4   Cf2-h3    18. Ff1-g2   Ch3xg1
19. Re1-f2   Cg1-f3    20. Rf2-g3   Cf3-d4    21. Rg3-h4   Cd4-b5
22. Rh4-h5   Cb5-a3    23. Tb1-b5

Is it the best bound found until now?

Best,

Nicolas.

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