Mate in 8!

BigDogg

Secret RHP coder

Posers and Puzzles

14 Apr 05

THUDandBLUNDER

Joined: 29 Feb 04
Moves: 22

16 Apr 05

Originally posted by schakuhr
yeah but how did the black light-squared bishop get out of his normal spot?

It escaped after bxa6 and before c7-c6.

craigy

Johannesburg

Joined: 02 May 04
Moves: 13066

16 Apr 05

Originally posted by phgao
I can find Mate in 9.

1. Qf7+ Kd8
2. Ne6+ Kc8
3. Nc5 Rd8
4. Bd3 Bf1
5. Bxf1 Rb8
6. Bxa6+ Rb7
7. Qb3 Re8
8. Qxb7+ Kd8
9. Qxd7#

I haven't checked for other possible solutions, but yours works if you tweak the finale.

phgao

Non-Sub Recs: 0

Joined: 08 Apr 05
Moves: 455

16 Apr 05

2 edits

Originally posted by craigy
I haven't checked for other possible solutions, but yours works if you tweak the finale.

How would you tweak the finale?
We need mate in 8.

craigy

Johannesburg

Joined: 02 May 04
Moves: 13066

16 Apr 05

Originally posted by phgao
How would you tweak the finale?
We need mate in 8.

With 7. Bxb7+ followed by mate.

phgao

Non-Sub Recs: 0

Joined: 08 Apr 05
Moves: 455

16 Apr 05

2 edits

Originally posted by craigy
With 7. Bxb7+ followed by mate.

Please write the line, I don't seem to follow you.

We get:

7. Bxb7+ Kb8
8. Qb3 a6
9. Bxa6+ Ka7
10. Qb7#

Were you thinking of 8. Na6+? But Kxb6...

craigy

Johannesburg

Joined: 02 May 04
Moves: 13066

16 Apr 05

Originally posted by phgao
Please write the line, I don't seem to follow you.

We get:

7. Bxb7+ Kb8
8. Qb3 a6
9. Bxa6+ Ka7
10. Qb7#

Were you thinking of 8. Na6+? But Kxb6...

8. Qxd8#

craigy

Johannesburg

Joined: 02 May 04
Moves: 13066

16 Apr 05

Originally posted by phgao
Please write the line, I don't seem to follow you.

We get:

7. Bxb7+ Kb8
8. Qb3 a6
9. Bxa6+ Ka7
10. Qb7#

Were you thinking of 8. Na6+? But Kxb6...

Doh! my mistake, I mixed up some lines in my analysis.

ilywrin

Joined: 30 Oct 04
Moves: 7813

17 Apr 05

THUDandBLUNDER is right.
1.Qb7! Rd8 2.Qb3 Ra8 3.Bd3 Rh1+ 4.Bb1 Rh8 5.Qc3 and the rest is pretty much obvious.

BigDogg

Secret RHP coder

on the payroll

Joined: 26 Nov 04
Moves: 155080

18 Apr 05

Originally posted by ilywrin
THUDandBLUNDER is right.
1.Qb7! Rd8 2.Qb3 Ra8 3.Bd3 Rh1+ 4.Bb1 Rh8 5.Qc3 and the rest is pretty much obvious.

4...Rh8 leads to the third repetition of position!

Rumor has it that this problem forced FIDE to change the definition of the threefold repetition to include castling rights. If castling rights are not included, the game would be declared a draw even though white has a forced mate.

Marinkatomb

wotagr8game

tbc

Joined: 18 Feb 04
Moves: 61941

18 Apr 05

1.Bd3 seems to cover the kings escape. If i had a board handy i'd work it out properly...

THUDandBLUNDER

Joined: 29 Feb 04
Moves: 22

18 Apr 05

1 edit

Originally posted by marinakatomb
1.Bd3 seems to cover the kings escape. If i had a board handy i'd work it out properly...

1. Bd3 Rh1+
2. Bb1 O-O-O (or 2.......RxB 3. O-O-O) and a quick mate looks highly unlikely.

GalaxyShield

Mr. Shield

Joined: 02 Sep 04
Moves: 174290

22 Apr 05

Nh7 might work. Not sure if it leads to forced mate but it looks pretty promising.

BigDogg

Secret RHP coder

on the payroll

Joined: 26 Nov 04
Moves: 155080

22 Apr 05

Originally posted by GalaxyShield
Nh7 might work. Not sure if it leads to forced mate but it looks pretty promising.

1.Nh7? has already been tried - look at page 1 of this thread.

The solution to the problem has also been posted in the thread.