Wednesday, 2 October 2019

Knight's Tours Notes in 12 PDFs

On 26 September I published this version of my "Knights Tour Notes" in the form of 12 PDF monographs that can be downloaded from my publications page. I am really pleased, and indeed relieved, that I have been able to get this finished. Though new historical information has since come to light that makes part of it out of date already!

http://www.mayhematics.com/p/p.htm


Knight's Tour Notes by G. P. Jelliss

1 — Theory of Moves

2 — Walker Tours

3 — Shaped & Holey Boards

4 — Oblong Boards

5 — Odd & Oddly Even Boards

6 — Geometry of Chessboard Knight Tours

7 — Symmetry in Chessboard Knight Tours

8 — Octonary & Quaternary Pseudotours

9 — Magic Knight Tours

10 — Augmented Knight & Leaper Tours

11 — Alternative Worlds

12 — Chronology & Bibliography

This series of 12 monographs, contain much of the material from my Knight's Tour Notes web-pages. It was orignally proposed to publish it in book form but has proved too much to reproduce that way. It may be possible to produce a shorter book, in a more popular style, if a publisher can be found.


Tuesday, 24 September 2019

Magic Knight Tour 12x10

This is formed by simply adding a braid to one of Awani Kumar's recently found 12x6 magic tours.


The file and rank sums are 605 and 726.

Non-Crossing Knight Tour

I've been doing some more work on knight tours.
This is the best I've found for a closed non-crossing knight tour on 32x32 board.
820 moves which is 80% coverage.




Monday, 26 August 2019

Update for June and July

I seem to have missed a month again.

On 26 June I played in a 5-round Blitz tournament at the Crewe Chess Club. Forget result.

On 27 June my computer website sub was due. It is just under £60 on a standing order, so OK.

On 30 June I reinstalled the scanner on my computer and began to scan material on knight's tours, beginning with a paper by Eggleton & Eid and the Retrograde Analysis of Dawson and Hundsdorfer that I have been meaning to copy for some time. It has now been uploaded to my website. I also gave it a mention on Alexander George's chessproblemnet pages.

On 10 July I renewed my ECF membership.

On 23 July as a member of a Crewe team I was taken by car to play in a special Rapid Play match at the Town Crier in Chester. I was on the bottom board (12) but fortunately managed to win both my games (as Black and White against the same opponent).



My ECF grade for rapid play is now up to 92 though my normal grade has dropped drastically to 66.

Addendum: I seem to have forgotten that I played in a local Rapid Play Tournament organised by the Crewe Chess Club and held at the Ibis Hotel on 19 May. In that I won a grading prize. The results are reported here: https://crewechessclub.co.uk/congress-results-2017/ The key to rapid play I find is to keep to openings you know quite well, but the opponent may not be familiar with. This enables one to build up a time advantage early on.


Tuesday, 11 June 2019

Eye Operation

Early this morning (Tuesday) I went to Leighton Hospital for an operation on my left eye to remove a cataract. This seems to have been successful so far, though it will probably take a month to get used to it. The operation itself was not a very pleasant experience. The eye itself was anaesthetised and the rest of my face covered by a cloth. Although I can now see with the left eye the image does not align with the right eye, but I suppose this will right itself eventually.

Last Wednesday (5th June) I had to call in a Locksmith since I've had increasing difficulty in getting back into the flat and was afraid of getting locked out. Replacing the lock cost me £136.80, but it does now open very smoothly. Leaders, the estate agents seem to think I should have called them first, but they haven't responded on other problems.

Back on 23 April I complained about the light in the wash room flickering, and they said they would contact the Landlords about it, but nothing has happened. I can't fix it myself as it is not clear how it is held up or comes apart to reveal the type of light, which may be a fluorescent tube type.

All the lights in the flat and in the hallway are very old and really need replacing. On Saturday the last of the old bulbs in the front room lighting failed. They are tiny incandescent bulbs no longer made. I replaced two in the other fitting a while ago with LEDs which don't really line up with the reflector plates. Another light just inside the door has never worked, and the light in the bedroom lacks the ring that is needed to hold up a lamp shade.

All these little irritations add up, but generally I am happy with the flat.

Update: 26 August 2019

The Estate Agents, acting for the Landlord, arranged for Sykes Electrical to come and fix all the lights on 18 June, which was done very quickly. They also seem to have reimbursed me for the cost of the lock repair.

Also I was signed off at the Eye Clinic on 29 June, and had the lenses replaced in my glasses by Vision Express on 22 August. So things are looking better.

Sunday, 12 May 2019

Town Centre Renovation

Here are before and after pictures of the area at the back of Crewe bus station. This is as far as the proposed renovation of this area has gone. The wooden structure was used for the Citizens Advice Bureau which has moved to Delamere House, shown in the left background of the first photo.


The area has just been levelled. The second photo also looks better since the trees are now in leaf. There have been no indications of when the work will continue.


Tuesday, 30 April 2019

Keeping Active

On 11th April I got my bicycle out for the first time since moving to Crewe to travel down to the Wistaston Memorial Hall to play chess in one of the U3A (University of the Third Age) groups. But I didn't get the energy to try it again on the 18th or 25th, partly because of rain and partly other attractions (e.g. World Snooker Championship).

Today 30th April I was due to go to the Leighton Hospital for a scan on my eye, but had a phone call yesterday cancelling it due to the doctor being unwell. Since it was a fine day I made a sudden decision to use my Senior train card for the first time this year for a visit to Chester, which is one stop away, a journey of about 20 minutes.

Chester is an immaculately maintained city, and clearly sign-posted. Having looked at a map before setting out which gave an idea of the layout, I had a good walk around, across the Canal, through the Grosvenor Park, down to the River Dee where I sat to watch the boats and ducks for a while. Then back through the town to see the Roman Amphitheatre and the Roman Gardens, which is a modern reconstruction, and a walk along part of the Roman City Walls. Steep steps up and down and a narrow walkway. Then after a meal a walk back along the river and through the Park.

I feel better for the exercise. So should also get back to swimming some time soon.