Illegal Position Contest!
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#447 legal, both sides have last moves, white or black for instance could have played hxgxh to get their pawns reversed. Both sides are missing enough material for this to happen.
#449 legal, e.g. black plays ...a5-a4-a3, white bxa3 doubling a-pawns, then gets the light bishop to b3. Black then plays ...c5-c4xb3-b2-b1, white pushes the a-pawn to a7 and axb8 black's promoted piece to get the dark bishop.
Apr 24, 2017
0
#450
chadnilsen wrote:
This is legal, right?
It is not because the f7 pawn could not turn into a bishop because the black bishop is on f8.
Apr 25, 2017
0
#453
Here's a great Illegal position! White's position is fully possible. Walk the King out, swing the Rook back to g1, bring the King back to e1. The doubled b-pawn gets out of the way by making the only capture of the game, that of the Black Knight.
Black can lose all the tempi in the world that he wants. Toggle the Knight until captured, and toggle the Rooks. However, notice that all 16 White pieces are on the board, and so therefore, that is nothing that Black can possibly have captured, and therefore, there is no way that the Black Pawn can possibly have promoted to a Light-Squared Bishop.
Move the g6-Bishop to any dark square and the position it totally legal. Not the result of very intelligent play, but totally legal! But not with it on a Light Square. 100% totally and completely impossible!
Typewriter44 wrote:
I think this is illegal
It is illegal, neither side lost any pawns, how did they all promote?
This is a common trick puzzle, because it appears in a semi-famous book, but is it possible for this position to be reached with white to move?
Yeah, the white knight moved, then the black pawn moved, then the white knight moved back.