# HAL CHESS - Mate in 4

greenpawn34
Posers and Puzzles 07 Jun '08 13:12
1. 07 Jun '08 13:121 edit
The Title should be Mate in FIVE.
(unless one of you guys find one in four).

This position arose in a game of HAL CHESS.

In HAL CHESS there is glich in the program.

If you capture a piece on certain squares then that captured
piece re-appears once the capturing piece has moved.

Eg: Suppose one of the glich squares was e7

If the Knight on e7 had captured a Black Knight on e7 and
White played 1.Ng6+ Black could play 1...Nxg6.

Determine which square is the glich square. Determine what is
about to re-appear. White to play and Mate in 5. (very easy).

(Next Problem - How do you edit the title? There is a glich in my brain.)
2. 07 Jun '08 13:141 edit
Does HAL CHESS recognize dead reckoning?

EDIT: I don't think it helps anyways
3. 07 Jun '08 13:22
as the position is legal for normal chess, the glitch square could be any of the squares, or indeed none of them? I've confused myself somehow, please help.
4. 07 Jun '08 13:27
There is only one glich square for it to work
and there is only one piece/pawn that can re-appear.
It's sound - White to play and mate in 5 (five).

If every square was a glich square the board would
be still be covered in pieces.
5. 07 Jun '08 13:34
Is the "glich square" h8?

1. Ng6+ Kg7
2. Rf8! Kh7
3. Ng3 Kg7
4. Nf5+ Kh7
5. Rh8 mate.
6. 07 Jun '08 13:36
Originally posted by greenpawn34
There is only one glich square for it to work
and there is only one piece/pawn that can re-appear.
It's sound - White to play and mate in 5 (five).

If every square was a glich square the board would
be still be covered in pieces.
Consider this game:

1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Bxc6 dxc6 5. O-O Bd7 6. Re1 c5

Only the Bishop reappears - not the Knight.
7. 07 Jun '08 13:481 edit
Since you seem to like these weird(ish) forms of chess, perhaps you might like the idea of Chameleon chess I saw some kids playing a few weeks ago as well. What they did is when capturing a piece, the capturing piece got the abilities of the piece it captured as well - i.e. a Knight that takes a Bishop became a Knight-Bishop (the Bishop was added on the Knight's square) that could move like a Knight and like a Bishop. If this piece would capture another one, you can choose either to keep the Bishop-Knight or to add the strength of the newly captured piece in return for one of the strengths. i.e. when the Bishop-Knight would take a Rook-pawn, you can choose to keep the Bishop-Knight, change it to a Bishop-pawn, Bishop-Rook, Knight-pawn or Knight-Rook.

The abilities of the Bishop-Knight standing on d5.

The most insane thing I saw in these brief moments was a Black King-Bishop on g7 taking a pawn on b2. Black was mated shortly afterwards.
8. 07 Jun '08 14:22
Is the "glich square" h8?

No.

Clue:

In this game the glich square is h5.
The White King moves.
Something appears on h5 and moves.
White then mates 4 moves later.

It's sound.
9. 07 Jun '08 14:49
I see, but this should work too:

1. Ng6+ Kg7

2. Rf8! Kh7
3. Ng3 Kg7
4. Nf5+ Kh7
5. Rh8#
10. 07 Jun '08 14:52
The intended solution is
1. Kg6

1. ... h4
2. Nf2 h3
3. Ng4 h2
4. Ne5 h1=Q
5. Nf7#

(there are more routes for the Knight to reach f7, i.e. via 3. Ne4)
11. 07 Jun '08 14:57
Good - yes knew dual routes for Knight was there.

Might get to work on another with one sole solution.
Intersting idea though.
12. 07 Jun '08 16:146 edits
I'm thinking the whole idea of HAL CHESS is flawed.

It's open to abuse.

Look at this very simple example in HAL CHESS.

White to play and win - the glich square is e8
When the White Knight moves a Black piece
( it cannot be a pawn) will re-appear on e8.

So what piece is under e8 and show the win.

Solution: There is a Black Knight under e8.

1.Nxg7+ Nxg7 2.h6 Kf7 3.h7! and wins.

Pretty good yes?

but infact all I have done is simply recreate a
famous study by Cheron (1895-1980) composed in 1952.

White: Ka1, Ne6. pawn h5
Black: Ke8, Nf5

White to play and win.

1.Ng7+ Nxg7 2.h6 Kf8 3.h7

(only one diagram per post - hence Edits)
13. 07 Jun '08 16:152 edits
Are you sure that works (2)? 1. Nxg7+ Kf7! and the Knight is frozen on g7 (has to 'defend' the Rook) and 2. h6 Kg6 isn't much better either.
14. 07 Jun '08 16:261 edit
Diagram correct now - can play good game of
blindfold chess - cannot do FEN without a board.

(never had to use it before - most edits were because
never knew only one diagram per post and was trying
to show 2 diagrams)
15. 07 Jun '08 21:47
Only e8 was the glich square not G7.

But you are correct - it's cooked.

1.Nxg7 Kf7! draw.

Back to the drawing board.