Problem 45239. Checkmate-02

Created by Asif Newaz

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Last Solution submitted on Feb 22, 2020

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William on 24 Dec 2019

Asif,
I think that several of the problem solutions need review.
1. In problem 2, 'Kf7' should not be in the solution since it is adjacent to 'Ke7'. Isn't the correct result {'Kh7',''Kg7','Kf5'}?
2. In problem 7, the king could take any of the knights. Is the solution listed as pos = [] because there are 3 knights on the board? If so, why is the solution to problem 9 listed as 'checkmate'? If not, a solution to problem 9 would be {'Ka3','Ka2'}. Similar questions apply
to problem 8.
3. Why is 'Kc7' not in the solution of problem 3?
I'm afraid I have a lot to learn about chess!

Asif Newaz on 24 Dec 2019

William,
thanks man. There was a bug in my code regarding the other king. i've corrected it. so
3. solution of 3 -- {Kc7,Kb8}.
1. solution of 2 -- {kg7,kf5} .. but not kh7 -- look out!!! there is a rook in the column-h.
2. In prob-7, the king is not currently in check.so he is not obliged to move. thats why empty.
2. in prob-9, yes the king can take out one of the knights & avoid check. Initially when i wrote this code, i didn't take into account the possibility of the king taking out another piece of the opponent. that would complicate the situation further. I kept it for 'checkmate-03'.

William on 26 Dec 2019

Asif,
Thanks for the clarifications.
In problem 2, I was aware of the rook at h3, but there is also a pawn at h5 that makes Kh7 a legitimate solution I think (one that is harder to detect programmatically). As in problem 9, it complicates the solution a little more than you intended.

Asif Newaz on 26 Dec 2019

william,
yes u're right.
my bad..i didn't see that pawn..there is a lot to look into i guess

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