ildjarn wrote:
The rules don't specify it but I assume that white has the move in all these diagrams?
The examples:
And the diagrams:
Hi Iljarn,
To answer your first question, yes in each diagram it is white to move (as usual for a problem).
Concerning the five diagrams you already succeed in 3 of them.
For the reader who is not familiar with such problem I will give the complete solution for these 3 diagrams:
Diag.3
White to play
Diag3 solution
Black to play
1...10-15 2.34-29 15x24
The solution needs 3 plies and when you compare the initial and the final diagram you can see that 2 pieces have been added and 0 king have been added. The score is then 3.2.0. I will write this with the six digit number 030200 which is the best (smallest) number you can get.
Diag 4
White to play
Diag 4 solution
Black to play
1...20-25 2.33-28 25x23
score 030200
Diag 5
White to play
Diag 5 solution
Black to play
1...21-26 2.28-23 26x28
score 030200
Let me comment your proposals for the first two diagrams
Diag 1
White to play
If I understand correctly you propose the sequence
Black to play
1...20-25 2.21-16 25x21
score 030400
You have to note here that you could get the same score from the diagram
Black to play
Does that mean that it is a dual and the problem is not correct? NO because 030400 is not the best (smallest) score!
Diag2
White to play
It is exactly the same situation in this diagram. You proposed a sequence with a score 030400, you can get easily a dual with the same score, but this score is not the best one.
Of course, for the time being, I let you and the reader search the solution for these two last diagrams