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Subject: Elo-related question, how to rate puzzles?

Author: Andrei P

Date: 14:37:39 12/01/04


in Livshitz book "Test your chess IQ first challenge", which test human tactical
skills, he gives a table that shows a correlation between % solved and elo
strength.  To create the table, the author tested the tactics in the book on
humans with known elo and and then fitted the data into the table (see below).

% solved   elo
100%	   2200
90%	   2000
80%	   1800
70%	   1600
60%	   1400
50%	   1200

I thought that, in general, one should be able to treat puzzles like players of
a given strength. The stronger the puzzle,the higher its  "elo". so one gets
higher elo performance by solving higher rated puzzles etc. But according to
this table, the puzzles do not behave like human players. For example, one could
surmise that the average elo of the puzzles in this "tournament" is 1200 (humans
with 1200 elo solve 50%), so according to fide expactacy, a 1600 player should
score 92% against opposition of 1200, but scores only 70% in the table.

What is the reason that relation between % solved and elo is different than for
human-human matches? if anybody has references to how puzzles are rated that
would be great.

Thank you, Andrei



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