# Is this position legal? A two part problem.

• #21

I have two of Raymond Smullyan's books of retrograde puzzles. I imagine omnipaul (who was quite a bit clearer in explaining the solution than I) had also seen similar stuff before.

• #22
tmkroll wrote:

I have two of Raymond Smullyan's books of retrograde puzzles. I imagine omnipaul (who was quite a bit clearer in explaining the solution than I) had also seen similar stuff before.

Those are good intro books. I have read Holmes and I started Arabian Knights recently.

• #23
BigDoggProblem wrote:

Don't worry about it - it's meant to take some time to solve, especially for people who have not seen many retrograde problems.

This is a very interesting concept of chess problems. Thank you for posting them here.

Would you happen to know any online source where I could find more of such problems?

• #24
Ajatsatru wrote:
BigDoggProblem wrote:

Don't worry about it - it's meant to take some time to solve, especially for people who have not seen many retrograde problems.

This is a very interesting concept of chess problems. Thank you for posting them here.

Would you happen to know any online source where I could find more of such problems?

The Retro Corner is a good starting point.

• #25

Thanks BigDoggProblem, you are cool!

• #26
Ajatsatru wrote:

Thanks BigDoggProblem, you are cool!

• #27

Wow. Unexpected. I hadn't even thought of the captures.

• #28

of course both of them are - likely no way

• #29

good

• #30
BigDoggProblem wrote:

tmkroll and omnipaul have it right. In the 2nd one, you need 6 black pawn captures on dark squares but you have only 5 white pieces that could have been sacrificed on dark squares. Position 2 is illegal.

Position 1 is legal because the doubled pawn is on a white square, which means you only need 5 dark-square captures.

I think this is the best summary! Well put, Mr. Dogg, and nice puzzle! =)

• #31
Firestopr wrote:

woowww. interesting puzzles! did u make these yourself?

I did this one myself, although I knew of the idea from other retro puzzles.

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