Big Brain Challenge

Can you find white's winning plan?

This was a study from the 5th Union Argentina de Problemistas de Ajedrez 2018 which had as a tourney theme of queens vs minor pieces. It has what I consider four very difficult moves to find, the last of which one is diabolical.

2q3B1/8/R3N3/8/1k6/1N2b3/pK3R2/8 w - - 0 1

Comments (12)
No. 1-12
Yancey_Ward
Yancey_Ward

Editor

Well done.

Alena
Alena

7.Nxa2+ Ka4
8.Nc3+ Kb4
9.Nd5+ Ka4
10.Bf7
The black queen is in zugzwang position.Any move for black is losing.

Yancey_Ward
Yancey_Ward

Editor

Again, the main line is going to be Ka4, but now at move 7 for black.

Alena
Alena

V-3

1.Rf4+ Bxf4
2.Rb6+ Kc4
3.Rc6+ Qxc6
4.Nxf4+ Kb4
5.Nd5+ Ka4
6.Nc3+ Kb4
7.Nxa2+ Kb5
8.Nd4+ Kc5
9.Nxc6 Kxc6
It's a winning position for white.

Yancey_Ward
Yancey_Ward

Editor

After 5......Ka4 in V-1 above, black can force white to play very accurately to gain the win. There is a very, very pretty zugzwang position where black's queen is finally assassinated.

Yancey_Ward
Yancey_Ward

Editor

V-1 is the main line, but the main line continues with 5......Ka4.

Alena
Alena

V-1

1.Rf4+ Bxf4
2.Rb6+ Kc4
3.Rc6+ Qxc6
4.Nxf4+ Kb4
5.Nd5+ Qxd5
6.Bxd5 a1=Q+
7.Nxa1
It's a winning position for white.

V-2

1.Rf4+ Bxf4
2.Rb6+ Kc4
3.Rc6+ Qxc6
4.Nxf4+ Kb5
5.Nd4+ Kc5
6.Nxc6 a1=Q+
7.Kxa1 Kxc6
It's a winning position for white.

Yancey_Ward
Yancey_Ward

Editor

3.Na5 leads to a draw with best play.

Yancey_Ward
Yancey_Ward

Editor

That was "you make a mistake at white's third move".

Yancey_Ward
Yancey_Ward

Editor

I also made a mistake in the authorship of the puzzle- Richard Becker was a co-creator. The source I had taken it from had omitted his name.

Yancey_Ward
Yancey_Ward

Editor

Alena, you should continue to look at that line, but you do make a white's at white's 3rd move.

Alena
Alena

1.Rf4+ Bxf4
2.Rb6+ Kc4
3.Na5+ Kd3
4.Nxf4+ Ke3
Am I on the right track, Yancey?



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