Use better-sqlite3 instead of node-sqlite3:
https://www.npmjs.com/package/better-sqlite3

Canvas for hexagonal board Vue reactivity :
https://stackoverflow.com/questions/40177493/drawing-onto-a-canvas-with-vue-js
custom directives ?

Desktop notifications:
https://developer.mozilla.org/fr/docs/Web/API/notification

Think about this:
https://alligator.io/vuejs/component-communication/
https://alligator.io/vuejs/global-event-bus/

CRON task remove unlogged users, finished corr games after 7 days, individual challenges older than 7 days

tell opponent that I got the move, for him to start timer (and lose...)
  --> no, not needed and impossible if everybody is offline
	==> just store this time locally (cheating possible but...)
board2, board3, board4
VariantRules2, 3 et 4 aussi
fetch challenges and corr games from server at startup (room)
but forbid anonymous to start corr games or accept challenges

Dans variant page, "mes parties" peut toujours contenir corr + importées (deux onglets)
En fin de partie (observée ou non), bouton "import game" en + de "download game" ==> directement dans indexedDB
--> sursis de 7 jours pour les parties par correspondance, qui sont encore chargées depuis le serveur

mat en 2 échiqueté : brnkr3/pppp1p1p/4ps2/8/2P2P2/P1qP4/2c1s1PP/R1K5
(Bb3+ Kb1 Ba2#)

// TODO: decodeURIComponent() for GET/DELETE parameters

2) Integrate computer play into rules tab
3) Allow correspondance play (no need for P2P: online moves through the server (which also store them))
4) Write my-games tab (included current/finished/imported)
   Use Dexie.js, or anything to store games locally
5) Write room tab
   Use this: https://github.com/feross/simple-peer for online games+challenges+chat
6) Test... and publish

Finish rules translation in Spanish + improve existing ones
Design: final touch (gain extra space on top, using space on the right)
Crazyhouse: center reserves, grey if zero available, numbers superimposed
Promotions: increase pieces sizes, better background.
Code: use two spaces instead of tabs, everywhere.
Increase code line length to 100 or more?
(http://katafrakt.me/2017/09/16/80-characters-line-length-limit/)
Chat button should be more apparent after game ends (color ?)
Reinforce security for problems upload (how ?)

Later:
Let choice of time control, allow correspondance play, several corr games at the same time
==> need to use indexedDB instead of localStorage. Maybe with Dexie https://dexie.org/
Each user would have a unique identifier stored in the client DB.
Allow to cancel games (if opponent doesn't connect again)
Live games storage would be browser-based: different games on smartphone, home computer, work computer... (why not ?)
==> (at most 1) running, and finished (which can be deleted from local memory)
Allow challenging a specific player (by his chosen name)
But keep the random pairings as main playing way + always playing in ZEN mode

style menu : surligner onglet courant

Interface :
 - newGame: une modalBox à paramètres, timeControl, type d'adversaire ==> "new Game")

Importer des parties : nécessite de parser le PGN produit (possible, un peu pénible)
mais permettrait mode analyse (avec bouton "analyse", comme sur ancien site).

espagnol : jugada ou movimiento ?
fin de la partida au lieu de final de partida ?

Bouton new game ==> human only. Indiquer adversaire (éventuellement), cadence (ou "infini")
Mode analyse : accessible à tout moment d'une partie (HH, ou computer) terminée + bouton "analyze from here" (sur parties observées)

Coordonnées sur échiquier: sur cases, à gauche (verticale) ou en bas (horizontale)

Import game : en local dans indexedDb, affichage dans "Games --> Imported"

Checkered : si intervention d'un 3eme joueur, initialiser son temps à la moyenne des temps restants des deux autres... ?

Mode contre ordinateur : seulement accessible depuis onglet "Rules" (son principal intérêt)

Hexachess: McCooey et Shafran (deux tailles, randomisation OK)
http://www.math.bas.bg/~iad/tyalie/shegra/shegrax.html
http://www.quadibloc.com/chess/ch0401.htm

Inspiration for refactor:
https://github.com/triestpa/Vue-Chess/blob/master/src/components/chessboard/chessboard.js
https://github.com/gustaYo/vue-chess