Brain Teaser That Might Be Flawed

3N1rk1/p1b1Q1pb/5pPp/5p2/5N2/K7/3rp3/8 w - - 0 1

I was going to post this problem a few weeks ago, but was unable to resolve a key variation where it appeared to me that black could mount a drawing defense. See if you can find the same flaw and tell me if it really is a flaw or not.

Comments
No. 1-6
Alena
Alena

After CraigB's move

10.Qxc5 Bxe6 11.Qf8+ Kh7 12.Nxe6 Ra2+ 13.Kb6 Rb2+ 14.Kc6 Rc2+ 15.Kd6 Rd2+ 16.Ke7 Rd7+ 17.Kxd7 Kg6 18.Qe8+ Kh7 19.Qf7 f4 20.Qxg7#

Yancey_Ward
Yancey_Ward

Editor

Craig, you are correct- I only briefy scanned Alena's V3- the line I found is 5.....Rd4+, not 5.....Ra2. I just scanned down to see 11....Ra7 and assumed it came from a4 and not a2. In that line, white cannot take at c5 after the check since black takes the knight at f4 and drawing with the e-pawn.

CraigB
CraigB

The main idea after Q:c5 is ...B:e6 11. Qf8+ Kh7 12. N:e6 Kg6 13. Qe8+ Kh7 14. Qf7 with spite checks interspersed at Black's discretion.

Yancey_Ward
Yancey_Ward

Editor

Yes, V3 is the key variation, and black's 11th move in your version of it is the move I think Krug overlooked. After a couple of days trying to find a winning line for white, I gave up and put that position before 11.....Ra7 into several different on-line chess engines, and none of them could find more than a pawn edge for white. It might be a winning position, but I just don't see how.

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