Strategy against the game. 
 For too long I was playing games against the game itself. That is, I believed that, objectively and regardless of the opponent, there is an optimal strategy by which victory is achieved. The point, whether in a study or in a match, was to find that strategy. This view created great pressure to find an optimal move and, at the same time, undue frustration when any…
At one time, when I was working, I used librcad . When I first used it, I had difficulties printing Greek text on drawings. I don’t need librecad anymore, but I ran it recently, out of curiosity to see if Greek fonts is now integrated without problems. Despite the six installed Greek fonts, I couldn’t write Greek comfortably (at least with the MText command). 
 In a post of mine ,…
About three and a half decades ago, before the advent of computers, I played classical guitar. At some point I wanted to express myself and, after buying and studying a book of harmony, I composed a piece. Because of its unusual chords, however, I had difficulty keeping the tempo. Then came computers with DOS and probably with the first windows, I was introduced to midi. The piece, after several…
After circle of fifths and diatonics , continuing to read about fundamentals of music theory , I find that the music clock can help in easily identifying the intervals of common musical terminology.
 
			 Our music clock 
		 
 
 
 Terminology 
 A musical interval , as the difference between two pitches, can be defined in an absolute way as the number…
The A minor scale is related to C major, in that they share the same, empty, key signature. These scales are two different sevenths of white keys on the piano. Because the notes are repeated in octaves, there could be five other different sets of white keys, that is with the same, blank, signature, defining different tonalities. I understood that, in the most, the two mentioned above were imposed,…

 The Simple Concept 
 To recognize a key: Treat the clock as a chromatic scale where C is 00:00 and each hour is one semitone (C#=1, D=2, etc.). Every sharp (#) in the signature adds 7 hours to the clock, and every flat (♭) adds 5 hours . For example, 3 sharps = 3 * 7 = 21 hours; on a 12-hour clock, 21:00 is 9:00 (A Major) . To find the relative minor, look 3 hours earlier (6:00 is F#…
I just finished reading the book “An introduction to Game Theory” by Martin J. Osborne. A truly wonderful book, which seems to have influenced even my everyday thinking. Its only problem, for me, is that it tries too hard not to make it necessary, for its reader, to use even elementary algebra. 
 Its beauty, however, lies mainly in the carefully chosen exercises. At the beginning…
“Once in a blue moon an idea sweeps through the bridge world and revolutionises thinking. The so-called Law of Total Tricks is so accurate in assessing potential in the contested auction and so easy to use (meaning in the book) that it is being introduced early and used to justify many subsequent bidding decisions.” 
 From the book “Understanding the contested auction”…
All necessary files are copied from ananke/layout folder to corresponding project’s/layout folder and modified there.
So, in order to have a dark theme, copy the below files. (Delete extention .txt, if you directly copy them.) You do not have to modify them. 
 
 project’s /layout/index.html . 
 project’s /layout/_default/list.html . 
 project’s…
For linux users it seems pretty easy and natural to let scid chess databases, on low CPU and RAM devices, to use stockfish chess engine that runs on a more powerful server. 
We start by installing stockfish onto our most powerful machine. 
In my case a desktop with 32G RAM and 8 CPU cores with 2 threads per core, that means 16 threads. 
 Stockfish server 
 The chess engine will run…
Years ago, got nostalgic for the time of youth and searched an old video game Elite I played on ZX Spectrum . Got upon pioneer . I loved it and tried to help in order for players to have stronger feeling of progress. I did a lengthy analysis in a relevant repository . The main idea was finally accepted, but the consequence to control the progress of player was still to come. I do not play the game…

			 Photo of paper Császár polyhedron 
		 
 

 
			 Animated Császár polyhedron Looping breathing-and-separation animation of the Császár torus 
		 
 

 
			 Paper cut unfold of a Császár polyhedron 
		 
 
 
 The article is about Császár polyhedron . 
 (Its dual is the…

			 Earth Observation NASA (Date Created:2010-08-23) 
		 
 

 As my mother language is Greek, my publications are sometimes written in Greek and sometimes in English, depending on who they are addressed to. (I have no intention of translating them). 
 
 Linux 
 I am an enthusiastic user of Linux systems and have been using them exclusively in…
I am Greek and live in Greece. Thirty years ago it was taken for granted, under normal circumstances, that I would be alive after thirty years. Today, the exact opposite is true. 
 My skills and knowledge should be irrelevant as evidence of the truth of what I post. I have never liked the logical fallacy of authority. As readers, you yourself are responsible for what you consider right and…