now write an algorithm that takes chess games (stored in PGN files) and converts the landing square of each move into its corresponding character from the 8x8 table you created, appending that character to a string. further encrypt the resulting string based on the result of the match. for example, you could use an ASCII-shift of some arbitrary positive integer if white wins and the negative of that integer is black wins. in the result of a draw you could reverse the string and ASCII-shift the characters by +1. again, these are just examples, feel free to use more elaborate methods in your actual algorithm.
now put that algorithm on a USB drive and place the USB drive in a small yet sturdy locked box which you carry with you at all times. keep the key to the locked box on your keychain along with several (at least 15) other keys to mask its identity.
this is the most effective way I know of to keep extremely strong passwords secure without having to memorize them.