Chicago L, IPP23 (2003) exchange puzzle designed by Donald Knuth

Mijkel1969 103

USD 18.00

: Closed

Postage: TBD
USD 0.00 to United States

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Bidder	Amount	Date
M****g 4	USD 18.00	11/15/2025 13:01:29

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Description

"Chicago L" is a modification by the computer genius Donald Knuth of a Henry Ernest Dudeney puzzle, exchanged at IPP23 (2003) in Chicago by perennial exchange participant Stan Isaacs. The puzzle consists of 12 L-shaped interlocking pieces which must be put together to form a solid square in which the lines form a continuous loop.

The puzzle is in its original felt pouch, complete with original instruction card and sealed solution sheet, as presented at IPP23.

I will ship within the US as a ground advantage ("first class") package for around $8.00 to $9.25 depending on postal code, or if preferred, at insured priority mail pricing from between $11.30 and $12.60, depending on postal code. I am happy to ship internationally at cost — typically around $20 for a small item like this — but I cannot always guarantee that overseas packages can be insured or tracked. Please do not send payment until postage cost is determined. Note, sadly, that tariff wars may be in effect for packages received in certain countries.

Please let me know if you have any questions about Chicago L.

Thank you for viewing my auction!

Specifications

Designer: Donald Knuth
Craftsman / Manufacturer: George Miller
Material: 3D printed plastic
Unit of Measurement: Centimeters
Size: 12 x 12 x 12 when assembled
Grade: (A) Collector: Flaws must be very minor, subtle, and difficult to identify.
Cosmetic Issues: None
Function: (1) Perfect: Neither loose nor tight, no binding or alignment issues, moves smoothly.
Functional Issues: None
Repairs: No
Packaging: Yes
Documentation: Yes
Assembly: Disassembled
Smoke-free home: Yes

Payments & Returns

Payment Methods: PayPal

Postage & Shipping

Item Location: 49006-3265, Michigan, United States
Ships To: Worldwide
Shipping Instructions: I will ship within the US as a ground advantage ("first class") package for around $8.00 to $9.25 depending on postal code, or if preferred, at insured priority mail pricing from between $11.30 and $12.60, depending on postal code. I am happy to ship internationally at cost — typically around $20 for a small item like this — but I cannot always guarantee that overseas packages can be insured or tracked. Please do not sent payment until postage cost is determined. Note, sadly, that tariff wars may be in effect for packages received in certain countries.

Returns Accepted: No

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