Jadeite wrote:
Nah, it can be done in 3. There's no reason for black to move anything but pawns.
lol not
if it is in three moves black does not have as pawn on e7
Is This Chess Position Illegal? #3
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Mar 5, 2011
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#24
TheMouse wrote:
Incorrect. In the final pisition of your "proof game" white can't castle.
Just out of curiousity, did you change the FEN? I'm pretty sure the original FEN was rnbqkbnr/pppppppp/8/8/8/5P2/PPPPP1PP/RNBQKBNR w kq - 0 1. 
But if white still has castling rights, then the position is illegal because every move changes color squares and no captures were made. When white plays f3, it changes colored squares. When a knight moves, it changes colored squares. When a rook moves, it changes colored squares. Those are the only pieces that can move. If it is white to move, then both sides have played the same number of moves. Black has half of his pieces on light squares and the other half on dark squares. White should have an even number of pieces on dark squares and an even number of pieces on light squares as well. :)
Illegal.
CuzinVinny wrote:
An extremely simple puzzle, yet slightly offsetting. It will be a bit of a challenge for some to figure out how this position is either legal or illegal, but I bet someone will solve this conundrum. Just gotta figure out the correct sequence, because in chess, white goes first always, not black! So why has black taken the first move and not white? Figure it out!
"I find it quite fun to search a chess board to see if a certain position is legal or not. And by legal, I mean it is a something you can find in a normal game. Is this position able to happen in an actual game? In other words, is this position legal or illegal? Post your answer, and tell me what you think the answer is. Any and all chess variations accepted. If illegal, also tell me what is wrong with the position. I'll post the solution when someone answers correctly."
1. Nf3 e6 2. Ng1 e5 Or 1. Nc3 e6 2. Nb1 e5.
The move is perfectly legal.
The move is perfectly legal. White and Black in chess. In chess, the player who moves first is referred to as "White" and the player who moves second is referred to as "Black". ... The pieces are often not literally white and black, but some other colors (usually a light color and a dark color, respectively). In the diagram above if the black piece moves first it is now playing White and the White pieces are playing black.
No, white is white and black is black. White moves first in a random puzzle diagram unless you can prove it's blacks move.
It's different for an actual game. You never know who is on move in a game and someone needs to tell. If you tell that white is on move, but he can't be then the game diagram is incorrect and illegal.
People sometimes confuse puzzle diagrams and game diagrams when they turn a game into a puzzle. They simply forget to tell who is on move or they assume you know it is a puzzle with white on move (by default). Just figure it out if you can!
Note that a diagram is not a position, it is just a diagram with chess units on certain squares. To turn a diagram into a position you need to know who is on move, what the castling rights are, e.p. rights and other things. There are ways to figure that out for puzzles but not for games. Occasionally you are ambushed when you learn that castling right appears to have been lost in a midgame diagram though you can't see that by studying it.
Another note: When a diagram is posted under the "More Puzzles" forum it is fair to assume it is intended to be solved as a puzzle diagram while you should look at it as a game when if appears in the "Game Showcase" forum.
That position looks legal. The white king can come out and triangulate with a couple moves on light squares.