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1.  JonathanB of London
25 Mar '08 16:12 / 3 edits
Following the recent mate in 9 thread Thread 90174, here's another chance to find a forced mate ...

Black to play and force mate...

It's pretty tough - I failed to solve it anyway. The answer - and a clue/easier version of the puzzle - can be found here:-

http://streathambrixtonchess.blogspot.com/2008/03/king-hunt.html

btw: the position comes from Hoffman-Petroff, Warsaw 1844 and I found it in Nunn/Cozens' book "The King Hunt"
2. 25 Mar '08 16:40
Originally posted by JonathanB of London
Following the recent mate in 9 thread Thread 90174, here's another chance to find a forced mate ...

[b]Black to play and force mate...

[fen]r1bN1rk1/pppp2pp/8/2bnP3/8/6K1/PB4PP/RN1Q3R[/fen]

It's pretty tough - I failed to solve it anyway. The answer - and a clue/easier version of the puzzle - can be found here:-

h ...[text shortened]... comes from Hoffman-Petroff, Warsaw 1844 and I found it in Nunn/Cozens' book "The King Hunt"[/b]
I must be missing something...

1... Bf2+
2 Kg4 d6+
if
3 Kh5 Nf4+
4 Kg5 h6#
if
3 Kg5 h6+
4 Kg6 (or Kh5) Nf4#

1... Bf2+
2 Kh3 d6+
3 Qg4 Nf4#
3. 25 Mar '08 16:46 / 1 edit
1... Bf2+
2 Kh3 d6+
3 g4 Nf4#
4.  JonathanB of London
25 Mar '08 16:51
1... Bf2+
2 Kh3 d6+
3 g4 Nf4#
OK,
1. ... Bf2+
2. Kh3 d6+

3. e6
5.  JonathanB of London
25 Mar '08 16:52 / 1 edit
I must be missing something...
yep - see my post above.
6. 25 Mar '08 16:56
Doh! All right, let me give this a bit more thought.
7. 25 Mar '08 17:44

1... Bf2+
2 Kh3 d6+
3 e6 Nf4+
4 Kg4 Nxe6
5 Nxe6 Bxe6+
6 Kg5 h6+
7 Kh5 Rf5+
8 Kg4 Rf6+
9 Kh5 g6+
10 Kxh6 Be3#
8. 25 Mar '08 17:55
6... h6+
7 Kg6 Bf5+
8 Kh5 g6+
9 Kxh6 Be3#
9. 25 Mar '08 17:58
6 Kh5 g6+
7 Kh6 Be3#
10.  JonathanB of London
25 Mar '08 18:05

1... Bf2+
2 Kh3 d6+
3 e6 Nf4+
4 Kg4 Nxe6
5 Nxe6 Bxe6+
6 Kg5 h6+
7 Kh5 Rf5+
8 Kg4 Rf6+
9 Kh5 g6+
10 Kxh6 Be3#
nice one. :-)

Petroff mated two moves faster if you want to keep looking but obviously your way is good enough!

btw:
Hoffman-Petroff reached your positoin after the 5th move (via a different move order). Seem to remember reading Black could have improved and held out a couple of moves longer but can't remember how. I wont have access to the book for a couple of days. I'll post the solution when I can.
11. 25 Mar '08 18:05 / 1 edit
7... Rf5+
8 Kg6 Rg5#

Whew! Thanks.
12.  JonathanB of London
25 Mar '08 19:15
7... Rf5+
8 Kg6 Rg5#

Whew! Thanks.
but if 8. Kg4 it goes on a bit longer...

I told you it was tough :-)
13. 25 Mar '08 19:22 / 2 edits
Originally posted by JonathanB of London
but if 8. Kg4 it goes on a bit longer...

I told you it was tough :-)
My first solution gives 8 Kg4. This is just a variation.

Edit: The variation below wasn't in response to your post... we posted at the same time then I edited mine. Sorry for the confusion.

7... Rf5+
8 Kg6 Rg5#