When did the 3-fold repetition and 50-move rule come about? The 1954
Reinfeld book "How to be a winner at chess" gives perpetual check, but
not these two rules. Of course, with 3-fold rule, the perpetual check
rule is not needed (also you don't have to judge whether or not a
position is perpetual check). The 1970 book by Harkness has these two
rules, but not perpetual check. So did they replace perpetual check
between 1954 and 1970?
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