Le niveau 7 est beaucoup trop dur, toutes les positions sont possible, oû que l'on mette une tour ou un pion...
There is a bug: It says that two pawns on the same column are possible. The only way for that to be done is for capture or en passant
I think that, if it's possible for two pawns to be on the same column, then it's possible & not a bug
It's bc first, you develop your knight to c3. the only move for black without moving pawns is to develop their knight. Then you put your knight in e4, only black move : knight anywhere. Then you check black in e6. Black is forced to take the knight, but they can't move their knight back.
Well, the two knights could have danced around for a bit before putting black in check. But crucially each knight changes the colour of its square with every move. If white's knight is on black and black's knight is on white, then they've each made the same number of moves, which means black moved last, which means black moved while in check and was still in check at the end of their turn which is impossible.
Avec les 2 tours? C'est simple: C'est au tour de blanc, donc noir doit avoir joué le dernier tour, cela dit, il n'a pu bouger qu'une seule pièce. Utilise tes tours pour que cette pièce n'a pas pu bouger non plus.
C'est pour écrire en "code", en décalant de 13 rangs dans l'alphabet chaque lettre.
C'est pour ça que certains messages semble ne rien vouloir dire: faut les décrypter en redécalant de 13 rangs les lettres :)
Il y a des outils en ligne pour faire ça automatiquement, cherche "outil décalage alphabet" sur google et tu trouveras ça (ou directement "rot13") ! ;D
Techniquement pour le niveau 12 ça n'est pas possible car les pion peuvent etre placé n'importe ou sans que cela soit impossblie si? Je comprend paaaaaas
This is such a cool concept and great execution with how it teaches the ideas gradually. Though I do wish there were more puzzles! I feel there are lots of things to explore with this concept!
Here is an example puzzle I came up with, but it's a bit of a twist on the concept: you need to place one piece/pawn of any color (not on the red squares) in order to make the position possible (rather than impossible). This one is a pretty difficult puzzle. (Also please ignore the terrible editing haha.)
I think I've got it : you have to place a white pawn on c6. Last move by white was bxc6 en passant (great idea to implement this weird rule in a puzzle btw).
In level 10, how is B6k/6B1/8/8/8/4K3/8/Q6/B possible? Black is in check, so white has just moved, there is a single check, so white has just moved the bishop. Undoing any possible move leads to a check on the king, so Black has moved into that check or ignored it illegally.
It is possible if white last move was to capture a piece on g7. Let us say a black pawn.
Before the white bishop moved to g7 capturing the pawn, that pawn shielded the king from the white queen.
Bu, qvq gurl cngpu vg ntnva? V guvax urer lbh unir gb guvax ertneqvat gur ovfubc. Ubj pna n ovfubc trg bhg bs vgf fgnegvat fdhner?
What possible previous two moves could there be such that this level 10 board state could possibly be legal?
I think I see it now, if there was a black rook on d4 then the moves: Kh8, Bxd4+
Would render the position legal
clever puzzles! some were too clever for me and i got some of them by accident but figuring out how a position was impossible was fun
hint
How could the bishop have moved the bottom left corner? Is there a way to make it impossible for the bishop to have moved there?
Could someone explain me one thing please (a screenshot and possible spoilers ahead):
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Why is this possible? You cannot do a mate twice, nor you can move Black King to that upper right corner if the corner is being guarded by either Queen or Rook. I beat the level nevertheless, but I still don't understand why my solution is wrong.
Anyone know how to do level 8?
Bayl jnl V frr lbh pna znxr vg vzcbffvoyr vf ol univat oynpx va purpx, ohg V pna'g frr ubj lbh pna qb gung jvgubhg gur xavtug.
Yes that needs to be rot13, I'm not letting anyone be spoiled.
Oh, and, people, giving level numbers for the early levels is pointless. Levels 1-5 are just five different impossibilities for the same position; you can permute those solutions arbitrarily within that set. Similarly, 6 and 7 can be interchanged.
I too am having trouble with level 12. I'm about ready to try brute-forcing it (screen-scraping the display for output and generating artificial mouse events for input)....
Since Black is in check, it obviously was White's move last, and, because the knight is pinnned by Black's queen, White must have been in check after Black's last move. But in a legal game, White cannot have been in check _before_ that Black move. Lbh arrq gb svaq cynprf sbe gur ebbx naq ovfubc fhpu gung, sbe nal bs Oynpx'f cbffvoyr cerivbhf zbirf, Juvgr jnf va purpx orsber gung zbir. If you still have trouble, wait a day or two and I'll point out another consideration which might help.
The knight has just checked the black king, so it must have just moved. This means black's queen was checking white just before. So black must have just made a move that put the queen in that corner square. Make it impossible for the queen to have moved there.
> So black must have just made a move that put the queen in that corner square.
True, but only because the position is such that none of black's other possible previous moves would have discovered check on white - well, without already having had white in check; black's bishop could have discovered check from the queen, but it would have had to itself had white in check to do so. (I'm just trying to keep people from jumping to unwarrantedly general conclusions based on this special case.)
Man, Level 12 is making me unreasonably upset. In a vacuum, three pawns of either color can be in literally any configuration between the 2nd and 7th ranks, so something about the queen-king setup on the side matters...
But how can it matter? Both queens amd kings can get to those positions regardless of how the pawns are set, and vice versa.
The white knight can check black's king in a certain number of moves, but there are places black's knight cannot be when that check is delivered.
My solutions for 6 and 7 are (rot13):
Gjb dhrraf
Gjb xavtugf obgu tvivat purpx
Then I’m stuck on level 8 nsgre orvat yvzvgrq gb cnjaf naq ebbxf. Pna'g oybpx gur ovfubc'f fgnegvat cbfvgvba orpnhfr bar bs gubfr fdhnerf vf nyernql erq. Oybpxvat gur zvffvat ovfubc'f fgnegvat cbfvgvba qbrfa'g jbex orpnhfr vg pbhyq unir orra pncgherq ol oynpx'f xavtug.
Got it, now I'm on 11.
8: Gur qvssrerapr sebz gur cerivbhf yriry vf vzcbegnag.
9: Guvf bar vf gevpxl, V unq gb guvax nobhg jul gur fbyhgvba jbexrq nsgre V nyernql tbg vg.
10: Abg gbb qvssvphyg, svaq fbzrguvat vapbzcngvoyr jvgu gur purpx.
Thanks a lot, my friend, now I’m on level 11. I brute-forced level 10; I have no idea why it worked.
If you're stuck at level 7, the solution you've missed is probably double-checking the king.
Level 8 is about White to Move, ergo Black just moved — but there's only one black piece that could have just moved, make that case impossible.
Level 9, there's a certain place black's knight can't be while black is also in check.