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Chessville
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Echo Peter's Problem World with FIDE Master of Chess Composition Peter Wong
Echoes are categorised in a variety of ways. A chameleon echo, for example, results if the black king is mated on different colored squares. Another kind of classification relates to the preciseness of the echo. When one mating position matches another completely, the echo is regarded as exact. Such an exact echo – also a chameleon one – appears in Problem 61.
This example brings us to yet another way of describing different types of echoes: the manner by which one mating configuration is shifted to its counterpart. Thus 62 depicts various reflection echoes, whereas the earlier 61 illustrates a translation echo. The latter type indicates that the participating pieces are all transferred in the same direction and distance. A rotation echo is shown in the next problem:
Multiple echoes are more frequently found in helpmates than other types of problems. Especially by using the device of twinning to vary the starting positions, a helpmate can render a large number of echo mates.
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