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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.
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.
Thanks BigDoggProblem, you are cool!
Wow. Unexpected. I hadn't even thought of the captures.
of course both of them are - likely no way
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! =)
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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