White to move. How should white proceed?
5nk1/2p5/1p3R2/2b1NNp1/p3Pp2/2P2P2/6r1/3K4 w – – 0 1
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1. Rf7 threatens 2. Rg7+ and 3. Nf7#. If Black chooses to defend f7 with 1…Ne6 then 2. Nh6+ and 3. Ng6# does the trick. Of course Black has many checks to intersperse, but none of them help to defend against the mate threat.
Main variation is
1.Rf7!! threatening 2.Rg7+ & 3.Nf7#
If
A>1….Kh1.2.Rg7!.and 3.Nf7#
B>1….Ne6.2.Nh6+.Kh1.3.Ng6#
C>1….Ng6.2.Nh6+.Kh1.3.Nxg6#
D>1….Nh7.2.Nh6+.Kh1.3.Ng6#
E>1…any bishop move does not prevent main variation
F>1…any pawn move does not prevent main variation
G>1…Rd2+.2.Kxd2 and then main variation mate cannot be prevented
H>1…Rg1+.2.Ke2.Rg2+.3.Kd3 and with no more viable checks, main variation mate cannot be prevented by black.
I>1..any other move, main variation mate cannot be prevented.
Harry
R f7
threatens N h6+ followed by N g6#
and R g7+ followed by N f7#.
Black can’t parry both.
I think we saw this one rather recently.
Wasn’t it 1. Rf7 that worked best?
I think so:
1. Rf7!
with the threat
2. Rg7+! Kh8 (because black knight occupies f8)
3. Nf7#
Black needs to deviate from this by playing his knight:
1. … Ne6 (or N any)
2. Nh6+! (the trick) Kh8 (because now the rook is still on f7)
3. Ng6#
Now Nf7 wasn’t possible, but instead Ng6 was because the black knight isn’t on f8!
Nice.
Now it remains to see how much black can delay this:
1. … Rg1+
2. Ke2 (enforced) Rg2+
3. Kd3 (Kf1? Rg1+) Rd2+
4. Kxd2 Be3+
5. K to white field Ne6
6. Nh6+ Kh8
7. Ng6#
So mate in 7 it is.
1.Rf7 ( threat 2.Rg7+ Kh8 3.Nf7#)
1….. Ne6 or Nh7
2.Nh6+ Kh8
3.Ng6# black R can not give perpetual check.
pht,
On the puzzle from last week where we debated the value of 2. …Qf6, I left one more comment on where you suggested black play 5. …Qe3- you overlooked white’s winning reply.