Only Chess
29 May 20
30 May 20
2 edits
@petewxyz said
@DeepThought
Thanks for that
[hidden][/hidden]
startquote move the queen so that it is taken by the knight is the only route to castling endquote no, it is not!
30 May 20
@greenpawn34 saidIt's definitely within your powers of solving. Between the Ke1, Ra1, and that pawn on c5, there are lots of clues.
When I saw the Ke1 and Ra1.
[fen]8/8/8/2P3R1/5B2/2rP1p2/p1P1PP2/RnQ1K2k[/fen]
I knew 0-0-0 mate must be in there somewhere. Never got around to solving it.
31 May 20
@petewxyz saidThere's other possibilities, but
@DeepThought
Thanks for that
[hidden] Move the Queen so it is taken by the Knight is only route to castling, but I haven't figured out why the Knight would be compelled to take the Queen?? [/hidden]
there is only one square where it has to be the knight that takes the queen, 1. Qd2 Nxd2 (e.g. Rxd3 stops the mate in 2) 2. Kxd2# no castling required.
. You have to consider each of black's potential responses and find a move that deals with each one. Huge hint: Castling is only involved in one of the lines where black moves his knight. You do need to clear the back rank to allow it.
31 May 20
1 edit
@eladar saidIt doesn't. Edit: except as a helpmate.
1Qd2 Rxc2
How does that result in a 2 move checkmate?
01 Jun 20
@eladar saidThere's my solution to the problem which gives mate in two against any possible move by black, my first post in this thread. There's also my comment on petewxyz's idea, where there's mate in 4 from the original position if one plays his move. It's not clear which of these you're talking about.
@DeepThought
Was your first move on your 2 move checkmate Qd2?
01 Jun 20
2 edits
@deepthought saidYour original.solution.
There's my solution to the problem which gives mate in two against any possible move by black, my first post in this thread. There's also my comment on petewxyz's idea, where there's mate in 4 from the original position if one plays his move. It's not clear which of these you're talking about.
1.Qb2 f3xe2 2.Qb7
01 Jun 20
@eladar saidI removed the above post due to confusion. You asked about moves involving Qd2, but that's not possible after the first move in my original answer.
Your original.solution.
1.Qb2 f3xe2 2.Qb7
02 Jun 20
1 edit
The king on e1 and rook on a1 immediately leads you on the (correct) path of O-O-O#. It would be much sneakier if that turned out to be a red herring.
For a while I wondered whether it was legal to castle queenside if your opponent has a piece (bishop or knight) on QN1.
Edit: Sorry, I see now that this was one of the puzzles to be solved in a problem solving competition rather than an entry in a puzzle composition competition.
02 Jun 20
2 edits
@deepthought saidI get it now
There's my solution to the problem which gives mate in two against any possible move by black, my first post in this thread. There's also my comment on petewxyz's idea, where there's mate in 4 from the original position if one plays his move. It's not clear which of these you're talking about.
very few moves are actually available to Black so with the Queen on b2 you can actually try out every move that Black can possibly do and there is always a mate for White so it is not about forcing things at all!
with Qb2 any piece black moves now moves out of the way of an attack on the white King by the Queen (diagonal if its the black pawn) other than if the knight moves when you castle
02 Jun 20
3 edits
@petewxyz
No need for hidden now I think.
Forcing as in keeping in check, yes you are correct. Black is put into zugzwang, which is a form of forcing.
Here is a classic example where a game ends poorly for the color who must move. The poor move is forced by the only moves possible.