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.
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