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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