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The second position is also possible:
Congratulations to both of you!
More positions coming up.
which of these positions is legal? (composed by cobra91):
here's another one, black can still castle on both sides but that doesn't really matter
is it too hard or is it too easy that nobody wants to answer?
Not many people are active in this thread, and those that are aren't always here. Give it time.
Anyway, thanks for contributing for the thread. I'll give your position a shot.
Alright here's the analysis:
Black has promoted all of his pawns. In order to achieve that, he must have made a minimum of 6 captures with his pawns. White is missing exactly 6 pieces, so all of them must have been captured.
This means that black's a, b, g, and h pawns couldn't have captured a piece on the way to promotion. Here I had to think about it, but it is possible thanks to black's missing bishops.
What's nice about this position is the symmetry, as play is basically the same on both wings.
you're right Shoopi!
here´s the answer without promotion:
Funny that both of our solutions took exactly 60 moves to complete
I know it can be done in less, but the question is, how much less? what is the least amount of moves necessary to reach this position?
This might be a new fun challenge to work on (by the way, the problems I posted on 163# are still up for solving )
Maybe it's for the best, since now people can't copy what you already did and try to find a small improvement that you missed
I'll try to do this now.
Ok, I analysed the position for quite a bit and looked at many different ideas. Unfortunately, many did not seem to work.
I managed to get 54 moves rather quickly, but then finding an improvement became much more difficult. Eventually I found a way to get 53 moves which, I believe is the best possible.
Can anyone find 54 or 53 moves? or god forbid, a better score
Also, here's a guideline on how to approach the puzzles in #163:
1) Can black get all of those promoted pieces?
2) What were the last moves?
I will also give a small hint straight away regarding which position is legal, to encourage people to try (highlight to see): Position 1 is illegal and position 2 is legal. So you might want to work on that one.
If no one seems interested (or has given up) in trying, I will post the solution!
I got the 53 eventually, will try for 52 now :)
Impressive! I wonder if we used the same method. I couldn't figure out a way to get 52, but I've seen crazier things happen!
My method was (highlight to see)
Shift all the white pieces along one to allow athe rooks on one side of the board an extra square for maneuvring
I think 52 is impossible but don't know. I might have a go at that #163 tomorrow now I've got a hint to help me :)
Yeah I think so too. We also probably used the same method to reach 53 moves. Here's mine:
52 , the white first-rank-shifting was unneccesary but I had put it in anyway and didnt feel like re-entering the game
For #163 the last white move must have been a pawn move (or for #1 1.Rh5+ N4xh5# but I doubt the composer left any spare white pieces)
In position 2 Black can play N4h5# with the same position as #1 except for a rook. But I have no idea why f5 would be a legal rook position and c4 not, I suppose I'll only figure out if i do loads of analysis of the position
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