Test Position 2

[Howard E]

Hi Paulo,

It's OK to be old !
I've seen this position re-surface every few years.
It's fun to view the reactions of those seeing for the first time.
Hope all is well with you.

Howard (58 years young)

[Jouni]

Yes after exactly 5 years this is still VERY DIFFICULT. Even after executing 6(!) moves like 1. Qxe5 fxe5 2. Rf1 a6 3. Bxa6 Qe7 engines take long time to see white's win

[D]6kr/4q2p/Bpr1P1pB/4p3/4P3/2P5/PP5P/5RK1 w - - 0 1

Analysis by Houdini 1.5a x64:

...
4.Bb7
= (0.05 ++) Depth: 31/71 00:07:48 1577mN, tb=7
4.Bb7
= (0.16 ++) Depth: 31/71 00:08:42 1748mN, tb=9
4.Bb7
+/= (0.40 ++) Depth: 31/71 00:10:52 2161mN, tb=20
4.Bb7
+/- (1.30 ++) Depth: 31/88 00:24:45 4991mN, tb=85
4.Bb7
+- (4.69 ++) Depth: 31/88 00:34:43 7037mN, tb=229

And may be this is not the best defence for black?

[ZirconiumX]

This looks like one of those positions that you will need Deep Blue III, or Hydra to solve.

Fruit 05/11/03

Score : 0.00
Depth : 18/1
Time : 00:00:58
Nodes : 12670000
N/sec : 216088
4. Bb7 Rd6 5. Bd5 Rxd5 6. exd5 Qc5 7. Kg2 Qxd5 8. Kg3 Qd3 9. Kg2 Qd8 10. Rf7 Qa8 11. Kg3 Qe8 12. Rg7 Kf8 13. Rb7 Kg8 14. Rg7

Matthew:out

[Houdini]

And may be this is not the best defence for black?

I've posted a full analysis of the position after 24.Qxe5 fxe5 a few posts above. 25.Rf1 wins for white.

Robert

[lech]

Try, try and don't cry!
We are believing that the top engines are able to sacrifice Queen in such positions.
Don't wait for Sting's source code!