Rules of Zadacha
by Grandmaster Sergej Yushkewitch (Oekra´ne)
Modern (contemporary) ZADACHA is the position, from which, during following play, appear two (or more) variants, every of which is finished in economical final position with that number of Black pieces blocked, which is indicated in the task.
Requirements are as following:
The notion of "oneconomical afgeven" does not exist in ZADACHA.
It may be said that there are two general directions in genre:
Combinational(like in Problems) solution and positional (like in Etudes) solution par exellence.
Also sometimes is used the mixt.
As a rule the division of the solution in variants begins after first move of White, but sometimes it is impossible (to pass move to Black after first move).
Back to Zadacha