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1.  SwissGambit
Caninus Interruptus
22 Sep '11 23:55 / 1 edit
Yosi Retter<br>StrateGems 2011

Mate in 2 moves
a) diagram
b) move Ba2 to b1
2. 23 Sep '11 01:24
Originally posted by SwissGambit

Mate in 2 moves
a) diagram
b) move Ba2 to b1
I can only do this in 3. Obviously coming back from the pub is not the best time to try. Will give this more thought tomorrow
3. 23 Sep '11 01:45
a.
Ng7

b.
c4
4.  SwissGambit
Caninus Interruptus
23 Sep '11 07:53
Still looking for the full solution and the theme ... can anyone spot it?
5. 23 Sep '11 08:05 / 3 edits
I don't quite get what the two parts are.

And is it black to move?
6.  SwissGambit
Caninus Interruptus
23 Sep '11 08:12 / 1 edit
Originally posted by VelvetEars
I don't quite get what the two parts are
First, just solve the diagram for Mate in 2 as normal. It's white to move.

Next, move the white bishop on a2 to b1, then solve for mate in 2 again from that position. [White to move]
7. 23 Sep '11 09:47 / 6 edits
I'm probably being daft but how is Savielly's solution wrong?
8.  hempster
she'll be right mate
23 Sep '11 10:02 / 1 edit
well all i can come up with is
white c2-c3 check
black d4xc3
white c1-b2 checkmate

its the only solution i can see
9. 23 Sep '11 10:16
Originally posted by hempster
well all i can come up with is
white c2-c3 check
black d4xc3
white c1-b2 checkmate

its the only solution i can see
In part a) Kd5 is on
In part b) Kf5 is on
10. 23 Sep '11 11:37 / 1 edit
Originally posted by hempster
well all i can come up with is
white c2-c3 check
black d4xc3
white c1-b2 checkmate

its the only solution i can see
Hi Hempster

1.c3+ Kxc3 Bb2 + Black has 2..Kc2

In these problems the position must always be legal, White always
moves first and the first move is never a check.

If the there is a mate starting with a check then problem is deemed ugly,
cooked and unsound.

Stay with it though, solving these things is like unravelling a tight knot.
There is a genuine mate in two moves on the board infront of you.
No tricks. Now dig it out. Solving one of these always gives you a glow.
11. 23 Sep '11 13:53
Originally posted by SwissGambit
[hidden]Yosi Retter<br>StrateGems 2011[/hidden]

[fen]2Q1N3/2Np4/1p1p4/1P1P2p1/3k1bR1/K2P4/B1P5/2BR4 w[/fen]
Mate in 2 moves
a) diagram
b) move Ba2 to b1
Ok, I've got the first variation...
Going to need a little time for the second I reckon

King has to move because everything else is pinned. Ng7 is the first move, so that pesky e5 flight square is a dead end after Bb2#. So the other flight squares end up in checkmate if Kc5 then d4#, and if Kc3 then Ne6#. My God that was hard!
12. 23 Sep '11 14:08
Got the second one!

c4?! King has three flight squares again. If Kc5 Ne6#, or Kc3 Bb2#, and if Ke5 d4#

Very tough SG, I've devoted a fair amount of my working day on those
13. 23 Sep '11 14:35
Originally posted by VelvetEars
I'm probably being daft but how is Savielly's solution wrong?
Would have saved me a lot of time if I'd looked at Savielly's solution first, oops
14.  SwissGambit
Caninus Interruptus
23 Sep '11 19:35
Originally posted by VelvetEars
I'm probably being daft but how is Savielly's solution wrong?
It's not wrong, it just isn't complete. A complete solution gives the possible black responses and mating continuations by white. See morgski's posts for an example.
15.  SwissGambit
Caninus Interruptus
23 Sep '11 19:51
Originally posted by greenpawn34
If the there is a mate starting with a check then problem is deemed ugly,
cooked and unsound.
Not necessarily cooked and unsound, but yes, generally ugly.

One exception to the rule is longer problems - some of those start with checks. Here is an example.

White to play and mate in 12
Starts with 1.Bc6+, but this is not considered a flaw.