Invented by great theoretician but mediocre player [Ernest Mipplington]
?, who also developed the complementary
Mipplington Convention, this is the standard way of measuring move difficulty. A simple move has a
Hughes difficulty rating (HDR) of approximately 0.2, a typical shunt around 1.2 and an average
Czukay Manipulation in the range 3.7 to 4.9. The hardest move ever played occurred in the semi-final of the 1976 World Championship. It took the Andorran Champion (whose name has sadly been lost) from Amersham
? to [Chalk Farm]
? with all the
diagonals closed, six lines
quartered, fifty-two stations
bulkheaded and sixteen more
blocked. It took him almost two hours to work out. The HDR was later found to be 396.5.
[TCM]
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