[Retros] BREAKING NEWS: New Proof Games Length Record

[Göran Wicklund]

Amazing after all these years!



A try on 59.5:



+---+---+---+---+---+---+---+---+

|*K | Q |   | . |*Q | B |*R | . |

+---+---+---+---+---+---+---+---+­­­

| . |*B | . |   | . |*R |*R |   |

+---+---+---+---+---+---+---+---+

|   | R |   | N |   | . |   | . |

+---+---+---+---+---+---+---+---+

|*Q |   | R |   | . |   | . |*R |

+---+---+---+---+---+---+---+---+

| R | N | R |*B |*R | . |   | . |

+---+---+---+---+---+---+---+---+

| R |   | R |   |*R |   | . |   |

+---+---+---+---+---+---+---+---+

|   |*N | B | R |*R | R |   | . |

+---+---+---+---+---+---+---+---+

| . |   | . |   | . | K |*N |   |

+---+---+---+---+---+---+---+---+

kQ2qBr1/1b3rr1/1R1N4/q1R4r/RNRbr3/R1R1r3/1nBRrR2/5Kn1

SPG 59.5



Last 17 moves,  verified by Popeye:



.42.... Re3 43.d5 Rdd7 44.d6 Rdf7 45.d7+ Kb8 46.Qd6+ Ka8 47.Qc7 Nge7

48.d8=R+ Nc8 49.Rd2 Rhg8 50.h8=R Rae1 51.Rh6 R1e2 52.R1f2 Rce4

53.Kf1 Bd4 54.Rfc5 Ne5 55.Rhb6 Nd6 56.Nf5 Ndc4 57.Nd6 Nb2 58.Rbc4 Nf3

59.Nb4 Ng1 60.Qb8+





..and 60.0:



+---+---+---+---+---+---+---+---+

|*K | . |   | . |*Q | B |*R | . |

+---+---+---+---+---+---+---+---+

| . |*B | Q |   | . |*R |*R |   |

+---+---+---+---+---+---+---+---+

|   | R |   | N |   | . |   | . |

+---+---+---+---+---+---+---+---+

|*Q |   | R |   | . |   | . |*R |

+---+---+---+---+---+---+---+---+

| R | N | R |*B |*R | . |   | . |

+---+---+---+---+---+---+---+---+

| . |   | R |   |*R |   | . |   |

+---+---+---+---+---+---+---+---+

| R |*N | B | R |   | R |   | . |

+---+---+---+---+---+---+---+---+

| . |   | . |   |*R | K |*N |   |

+---+---+---+---+---+---+---+---+

k3qBr1/1bQ2rr1/1R1N4/q1R4r/RNRbr3/2R1r3/RnBR1R2/4rKn1



Last moves:

... 58.Rbc4 Nf3 59.Nb4 Ng1 60.Ra2 Re1#





Best regards,



Göran Wicklund



-----Original Message-----
From: Retros [mailto:retros-bounces at janko.at] On Behalf Of Thomas Brand
Sent: den 10 februari 2017 12:58
To: The Retrograde Analysis Mailing List
Subject: [Retros] BREAKING NEWS: New Proof Games Length Record



Dear all,



Today the February issue of Die Schwalbe appeared -- and it contains a new length record for unique proof games! In hard work Andrey Frolkin and Werner Keym managed to set the new record to 58.5 moves -- based on the scheme of the former record by Pronkin and Frolkin. Congratulation!!



You may find the problem together with some "record history" in my blog:



http://www.thbrand.de/2017/02/10/neuer-laengenrekord/



Have fun, and best regards,



Thomas

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