Checkmate in zero and half a move.

I searched on the net and on chess.com to find an answer to this problem but couldn't find anything, I hope the question was not already answered here.

Those are 3 problems from the last section of Dragoslav Andric's book about chess (igra miliona), but the answer is not given.

I think I have a satisfying answer for the first one, maybe for the 3rd one, but for the second one I'm lost.

Can anybody figure out the answer? (or maybe already knows it?)

Thanks!

Problem 1: Find a checkmate with zero moves.

Problem 2: Checkmate with half a move.

Problem 3: Checkmate with half a move.

1. is flip the board around =0

>> Do you have to chose where to place a non-existent piece on the board?

I don't think so.

>> 1. is flip the board around =0

Yep that was my idea too :).

2. I think its white has placed his pawn on h8, removed it, and now he finished his move with h8Q#

I know the 3rd one, saw that somewhere long time ago.. Am I allowed to say?

yes, i mesaged rooperi to ask him if it was the answer

No, it's actually rather silly.

The half move is with the knight. You lift it up (ever so slightly) but dont put it anywhere. This lets the Bishop check through while the Knight still covers h7 and g8.

1) flip the board

got it. i saw one where white has a queen, bishops, rooks, but the black king was in the middle of the board, impossible to mate in 1, so u lift the king, and you see mate.

That was what I thought too, but I like kid_of_chess's idea better :). It explains both #2 and #3.

1. flip board
2. pawn on h8 was lifted, just placee queen
3. 3.lift the knight so bbishop can attack, but don't move it to a different square (so it'll cover h7 and g8)

1. You could flip. You could also take the king with the pawn. It's a non-existant move --- zero moves.

Point about problem 1 that no one mentioned:

Why do you suppose the composer put all those pawns on the 2nd rank?

Oh hey, right, cool. The board is forced to be rotated, since at the current position it's illegal.

It's true! You don't have to flip the board, but your head. The pawns are on the 7th rank, otherwise the position would be illegal (look at the light square bishop).

That's why you rotate 180°. :)

look away if you don't want to know the answer:1.flip the board.

2.lift the king up like you're about place it on g6 but don't let go and you haven't dropped it so he can't capture it.

3.lift the knight up but don't move it.

note: tell me if I'm wrong.

Mainline_Novelty already gave the correct answer for 2 (finish up the promotion to a queen on h8). If you attempt to place the king on g6, without releasing the king it's not on g6 yet and hence cannot attack the squares around it.