# mate in 2

Mephisto2
Posers and Puzzles 10 Apr '06 12:12
1. 10 Apr '06 12:12

White plays and mates black in two moves. Not as easy as it looks at first sight!
2. 10 Apr '06 12:382 edits
King to E3 , then rook to H1 ?
Sorry i meant King to E6..then rook to H8 ...
3. 10 Apr '06 12:44
Are you sure black has no escape after 1.Ke6?
4. 10 Apr '06 13:01
Originally posted by Mephisto2
Are you sure black has no escape after 1.Ke6?
0-0-0 ?
5. 10 Apr '06 13:071 edit
I see no way out after 1.Ke6
Black can neither put the white king in check nor secure h8. The black king has only two legal moves, 1...Kd8 or 1...Kf8, both of which result in checkmate after 2.Rh8.

EDIT: Aww, damnit
6. 10 Apr '06 13:14
can black castle..?
7. 10 Apr '06 13:17
Pawn on D5 takes C6 pawn..then rook h8
8. 10 Apr '06 13:17
can black castle..?
I can't see why not...?
Do we have to do a retro analysis here?
9. 10 Apr '06 13:181 edit
can black castle..?
why not?

edit: after 1.cxd, the next move wouldn't mate because f7 is available.
10. 10 Apr '06 13:22
A very nice puzzle:
Let's assume for a moment that black CAN castle:
then either his last move was either A) 0...b2-b1B or B)0...e7-e5.
If it is the second B) then obviously:
1.dxe6 (en passant) gives a solutin.
Now lets us consider the other option, i.e Black's last move was indeed:
A) 0...b2-b1B. This is howewer impossible. because of the discrepancy between the number of captures needed to be made by Black and the number of White pieces still on the board. So the Bishop is not promoted on b1. And now comes the real question. Can we establish that Black CANNOT castle, or no?
I will have to think about it some more.
11. 10 Apr '06 13:23
Originally posted by Mephisto2
[fen]r3k3/ppp5/2p2P2/3PpK2/8/NP1R4/p1P3P1/1b3N1R w q - 0 1[/fen]

White plays and mates black in two moves. Not as easy as it looks at first sight!
Oh god... Not yet another retrograde puzzle!

1.dxe6! moves 2.Rh8#
12. 10 Apr '06 13:32
Originally posted by ilywrin
A very nice puzzle:
Let's assume for a moment that black CAN castle:
then either his last move was either A) 0...b2-b1B or B)0...e7-e5.
If it is the second B) then obviously:
1.dxe6 (en passant) gives a solutin.
Now lets us consider the other option, i.e Black's last move was indeed:
A) 0...b2-b1B. This is howewer impossible. because of the discrepancy ...[text shortened]... n. Can we establish that Black CANNOT castle, or no?
I will have to think about it some more.
You didn't mention a third option for black's last move (in the assumption that castling is possible): dxc. This, however would also mean a promoted bishop on b1, which you proved impossible.
13. BigDoggProblem
10 Apr '06 16:10
Originally posted by Mephisto2
[fen]r3k3/ppp5/2p2P2/3PpK2/8/NP1R4/p1P3P1/1b3N1R w q - 0 1[/fen]

White plays and mates black in two moves. Not as easy as it looks at first sight!
White is missing six units; Black needs to make six pawn captures. All missing White units were captured by Black pawns.

White is missing a dark-square Bishop. This means Pa2 did not come from f7, for Black would have made all his captures on light squares. The only alternative is that the pawn on e5 is not the original e-pawn.
Black's last move was not ...e7-e5.

If Black's last move was ...d7xc6, then Bc8 died at home and Bb1 is promoted. However, a Bishop promoted on h1 could never have left the square, and Black has no spare pawn captures to reach f1 (the e- and f- pawns are already spoken for). Promoting on d1 or b1 needs even more P captures than f1, so these are also impossible.
Black's last move was not ...d7xc6

Since Black's Pe5 was the f-pawn, it has no last move. The only remaining possibility is that Black moved the King or the Rook on his last move - therefore, he can't castle. White mates by 1.Ke6.
14. coentje
Plop!
10 Apr '06 16:37
Originally posted by Mephisto2
[fen]r3k3/ppp5/2p2P2/3PpK2/8/NP1R4/p1P3P1/1b3N1R w q - 0 1[/fen]

White plays and mates black in two moves. Not as easy as it looks at first sight!
Lol, I See you have taken it to prove the point i made in pm ðŸ˜€
15. sonhouse
Fast and Curious
10 Apr '06 20:163 edits
Originally posted by fetofs
Oh god... Not yet another retrograde puzzle!

1.dxe6! moves 2.Rh8#
That looks good. You are assuming blacks last move was e5.