Best Chess Puzzle

Originally posted by aginis
thanks, i'm honored.

1.Qc8 threatens Bd7+
1...Kg8 forced
2.Bc7!! a neat little move whose consequences we will see.
2...QxQ forced again.
3.Be5 threatening a discover mate if the king moves and threatens to queen the f pawn with mate if the black queen doesn't guard the square.
3...Qc5! guards f8 and attacks the bishop on e5 (capture with check would to the next).

for more info look here
http://en.wikipedia.org/wiki/Null-move_heuristic

Originally posted by aginis
thanks, i'm honored.

1.Qc8 threatens Bd7+
1...Kg8 forced
2.Bc7!! a neat little move whose consequences we will see.
2...QxQ forced again.
3.Be5 threatening a discover mate if the king moves and threatens to queen the f pawn with mate if the black queen doesn't guard the square.
3...Qc5! guards f8 and attacks the bishop on e5 (capture with check would ...[text shortened]... to the next).

for more info look here
http://en.wikipedia.org/wiki/Null-move_heuristic

Originally posted by LanndonKane
Nice, nice, very good indeed.

How long did it take you to work through all the variations?

Originally posted by BigDoggProblem
You left out the moves 3.gxf7+ Kh8 and now only 4.Be5!

Other than that, good explanation and congratulations for solving such a difficult problem.

Originally posted by aginis
5-10 min i was looking at a lot of other stuff too. and before you gave the hint i was sure Qc5 was the first move.

Originally posted by LanndonKane
Geez, it would have taken me the better part of an hour to do all that 😕

haha, I had a similair Idea, but I spent a lot more time looking at Gxh7+ Kh8 (kxh7 is mate in 2) and then playing Be2.....If only i looked at Bc7 Propably would of got it then.

"Futility pruning: This is an aggressive method of narrowing down the search. It allows the program to go much deeper, but it also increases the possibility that it will oversee something."


Ok - Did any of you turn this function off and then use fritz?


oh, and: -

"Selectivity: Fritz uses a search technique that is highly "selective". This means that instead of looking at every single line of play, however stupid, it tries to narrow things down to meaningful variations. This allows it to go much deeper, but it can occasionally miss a highly unusual continuation. This is the case in positions involving "zugzwang" (i.e., positions in which one side faces disaster because he is forced to make a move). This can be corrected by reducing the selectivity value – when solving studies you may want to set it to zero, since here zugzwang is very often involved. However, remember to set it back to a higher value for normal games. Otherwise, the search depth will be decreased, and the program will not be as strong."


now see if fritz gets it or not...

Originally posted by Shinidoki
"Futility pruning: This is an aggressive method of narrowing down the search. It allows the program to go much deeper, but it also increases the possibility that it will oversee something."


Ok - Did any of you turn this function off and then use fritz?


oh, and: -

"Selectivity: Fritz uses a search technique that is highly "selective". This mea ...[text shortened]... creased, and the program will not be as strong."


now see if fritz gets it or not...

Originally posted by LanndonKane
Is there a way to undo learning, because fritz has already learned the position and gets it everytime now.

I think it is flawed.
Bc7 is a blunder, and the position is realistically drawn if played correctly.
After 3. ... Hh8 4.Be5 Qc5! 5.Bb2?? loses to a3 6.Ba1 Nc7 and you cannot move the king anywhere. 7. Be5 Qxe5+ 8. Kxe5 Kg7 and white is dead.

Originally posted by Xpofer
I think it is flawed.
Bc7 is a blunder, and the position is realistically drawn if played correctly.
After 3. ... Hh8 4.Be5 Qc5! 5.Bb2?? loses to a3 6.Ba1 Nc7 and you cannot move the king anywhere. 7. Be5 Qxe5+ 8. Kxe5 Kg7 and white is dead.

Originally posted by ThudanBlunder
What is this new piece, H?

When did the pawn on a5 move to a4, allowing 5...a3?

Wooops.

ok here.

1.Qc8 Kg8 2.Bc7?? Qxc8 3. gxf7+ Kh8 4.Be5 Qc5! 5.Bb2?? Nc7 6.Ba1 *a4* 7.Bb2 *a3* 8.Bb1 This move is imposible 8 Be5 Qxe5 9. Kxe5 Kg7 or
5. Kf5 Qxe5 6. Kxe5 Kg7 7. Ke6 Kf8 abd black is winning

Originally posted by Xpofer
Wooops.

ok here.

1.Qc8 Kg8 2.Bc7?? Qxc8 3. gxf7+ Kh8 4.Be5 Qc5! 5.Bb2?? Nc7 6.Ba1 *a4* 7.Bb2 *a3* 8.Bb1 This move is imposible 8 Be5 Qxe5 9. Kxe5 Kg7 or
5. Kf5 Qxe5 6. Kxe5 Kg7 7. Ke6 Kf8 abd black is winning