Chess Sudoku

Liar 

I think I found the solution though, or A solution since I doubt you went to the trouble of confirming there's only one:

Sorry--I probably should have given you more pieces. :P

And you're right, I didn't check to see if there were more solutions.

As for your solution, it is very nice. However, in my original puzzle, the piece on d5 was a black knight, and the piece on h4 was a black pawn. I think you're close though! :)

By the way TheronG12, here's your knight idea with the kings incorporated. :)

Nice!

Lets keep on trying! Maybe I should make an official free app, as I am learning to code over summer break

That'd be cool. I don't know how fast I can make puzzles, as I don't have a lot of time to spend on it. I also haven't figured out how to verify that the puzzle I put out has only one solution. Any suggestions?

Suggestion: Since I gave a perfectly valid solution which wasn't the same as yours, don't waste your time trying  Realistically, it would probably take a computer to do that, at least unless you add a lot more information. You could do it yourself, but it might take hours.

You could include other kinds of information than just "this piece goes here", for example a given square is empty, or a given square contains a black/white/unspecified piece, or a square contains a pawn, but you aren't told what color, or a given column includes a bishop, or there is only one pawn on a certain row.

Thx for the ideas. :) They're all great, and I'll try to implement them with the next puzzle.

Unfortunately, I guess you didn't understand my response to your solution. It was not actually valid. What I was trying to say was that you actually changed two of the eight pieces I started you out with. The knight on d5 and the pawn on h4 were among the ones I started you with, but you replaced them with a pawn and a bishop, respectively.

Also, if I did clues instead of just giving certain pieces, how many clues do you think I should do?

3?

That's a possibility, but that just seems like very few, especially if we're trying to limit the number of alternate solutions. Maybe between 5 and 10?

Oh, you're right. So I found a new solution to the original problem but didn't solve your puzzle  I'll try again later.

The less clues you give, the harder it is, and also the more likely it is that there are multiple solutions. If there's few enough clues then the increase in possible solutions might actually make it easier. I'd guess that about 10 clues is probably a good number, depending how informative they are. "White knight on c3" is obviously more helpful than "there is at least one pawn on the 4th rank", but not necessarily more than "there are exactly three pawns on the 4th rank."

 @TheronG12: It's not a valid solution since fxe4 exists in the position; ie a threat on a piece.

You're looking at it upside-down, the pawns are marching the other way.

Admittedly, it's invalid if black just pushed the d-pawn and white could capture en passant 

We should include ranks (which is possible in diagrams) to avoid confusion

I think this is a valid solution to your puzzle. If so it definitely has multiple solutions, for example you could switch the b7 rook and c8 knight.

For problems like these I would suggest adding the ranks and files like this

Not like this

Very nice! :) That is definitely a valid solution. Now, I don't know how many solutions to my puzzle there are, but here's mine:

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