Monday, March 24, 2014

Attacking chess tactic

White to move. Can White save this game?

7r/3PR1bk/2pQ4/5p1p/2q3pP/2Pn2P1/pr4P1/4R2K w - - 0 1


Anonymous said...

In the initial position black is up two minor pieces and both sides have a pawn one square from promotion. They also both have a weakened king position however it is the black king that is in immediate danger and white can take advantage of this with
1.Qf6 using the pin and threatening to mate on g7.
Black can throw in the spite check
1...Nf2 but after 2.Kh2 he has to defend the g7 square

if 2...Qg8
3.Qxf5+ Kh6
4.Qg5+ Kh7

if 2...Rg8
3.Qxf5+ Kh8 (3...Kh6 then same mating line in previous variation)
4.Qxh5+ Bh6

if 2... Qxc3 (or 2...Qc4) then 3.Rxg7#

if 2...Qf7
3.Qxf7 Rg8 (3...Kh6 4.Qxg7#)

There are no other ways to defend the g7 square or to check the white king so black can not avoid mate.

Chris Goodman said...

I am not quite sure what type of chess notation is used above. Could you clarify? Thanks!

pht said...

This diagram seems to have plenty ideas, but complicated to make them work.

I saw the diagram before without solving it, but now I directly spot one move that seems to undoubtedly improve on already existing white ideas:

1. R1e6!

Cutting off black queen's access to f7, this threatens Rxg7+ Kxg7 Qe7+ Kg8 Rg6#.

If Rg8? then Rh6#.

To come out of this mate threat, black will have to sack a lot of material and give white a comfortable win.

Prof.S.G.Bhat said...

1.Rxg7+ Kxg7
2.Re7+ Qf7
3.Rxf7+ Kf8
Who the hell played black in this game?

pht said...

Please forget my first post!

1. Re6?? must be wrong since it gives black a1=Q+, Rxg2+ and Nf4+ etc., black wins.

We can also forget 1. Rxg7?? because of black's resource Qf7.

The correct solution has to be:

1. Qf6!! Rg7 (Qf7 Rxf7 Rg7 delays by one)
2. Qxf5+ Kh5
3. Qg5+ Kh7
4. Qxh5#

2. ... Kh8
3. Qxh5+ Bh6
4. Qxh6#

I conclude this is enforced mate in 5.

pht said...

Finally I notice that it should be enforced mate in 4, since:

1. Qf6 Qf7?
2. Qxf7! Rg8
3. Qxh5#
where Qf7 was exactly the opposite of a "delaying Q sack".

Prof.S.G.bhat said...

I made mistake in previous comment.Probably I used three rooks for white.
!.Qf6 Qg8 or Rg8
2.Qxf5+ Kh6
3.Qg5+ Kh7
with 1... Rg8 as above black can play 2..... Kh8 which also fails by
3.Qxh5+ Bh6

Awfulhangover said...

FEN-notation , very useful, i.e to paste in chess engines
google it

mesilah said...

1. Rxg7+ Kxg7
2. Re7+
Now Black has a number of alternatives:
If 2....Qf7
then 3. Rxf7 winning
If 2...Kg8
3. Qg6+ Kf8
4. Qg7mate
If 2...Kf8
3. Qf6+
If 3....Kg8
4. Qg7mate
If 3....Qf7
4. Qxf7mate

Gorilla said...


Aninda Sinha said...

1 Rxg7+ Kxg7
2 Re7+ Kg8
3 Qg6+ Kf8
4 Qg7#

Aver Atom said...

1. Rxg7+ Kxg7 2. Qe7 Qf7 3. Qg5+

Yancey Ward said...

Qf6 is the only move to save white- he loses with moves like Rxg7. This puzzle has been posted multiple times the last year, the last being in December.