﻿﻿ MatPlus.Net

Website founded by
Milan Velimirović
in 2006

7:06 UTC
 ISC 2020
 Headlines Forum* Members DL Archive Links

Username:

Password:

Remember me

 Forgot yourpassword?Click here! SIGN INto create your account if you don't already have one.
 CHESS SOLVINGTournamentsRating lists1-Oct-2020
 B P C F

MatPlus.Net Forum General Dual avoidance & try in helpplay problems?

You can only view this page!

### Dual avoidance & try in helpplay problems?

Could anybody, please, define the both terms in helpplay: dual avoidance and try?
Yes, yes, after publishing problems for about 7 years, I couldn't find the answer.
And the concrete examples, 2 in one day, pushed me to ask this question: www.juliasfairies.com/problems/jf-2019-ii/no-1449 & www.juliasfairies.com/problems/jf-2019-ii/no-1450. Dual avoidance or tries?

 (Read Only) pid=17960

My 50c: The terms make more sense in direct play -
White tries, Black avoids duals. Consequently, that
color scheme should also be used in help play.

 (Read Only) pid=17962

Helpmates are different (© Chris Feather).
Therefore no principles inherent in direct mates should be mechanically applied to helpmates!

 (Read Only) pid=17964

Hi Julia!

Below the article TRY IN HELPMATE (Encyclopedia of Chess Problems, p.441)
In a helpmate the composer may insert a try play in variety of ways: a side may seem to lack a tempo move, moves may have to be played in a correct order, etc.
Then, the composer may use a mechanism familiar from dual avoidance in direct mate problems: wrong choice of blocking unit, a pin of the mating piece, etc.

But it is not getting clearer, I guess :-)

 (Read Only) pid=17965

Chris Feather ("Black To Play"):

Attempts to introduce so called "tries" have from time to time been made by a variety of composers with inspiration from directmates. The difference is that directmate tries have refutations while helpmate "tries" simply don’t work, being a failure of cooperation. While directmate tries look to Black for resourcefulness, helpmate "tries" look to the solver for incompetence!

 (Read Only) pid=17966
(6) Posted by Nikola Predrag [Sunday, Sep 29, 2019 15:23]

Victoras,
how is that Feather's statement useful?
There are trivial questions and there are problems.
The answer to a trivial question could be laborious but still trivial so, there's no problem in the first place.
The solution to a problem is a principle, even if it's simple.

Some tries may be trivial and some may reveal an underlying principle.
Sequence of the moves is the answer to a stipulation.
What is relevant and what is not and why, that reveals the principle and the full solution to a problem.

 (Read Only) pid=17967

No more posts

MatPlus.Net Forum General Dual avoidance & try in helpplay problems?