Wednesday, August 27, 2014

Tricky chess tactic

White to move. What is the best continuation for White? How should white proceed?

5rqk/7p/4p1p1/1bppP3/5NQ1/p2B1R2/1r3PPP/6K1 w - - 0 1


Anand Gautam said...

Nxg6 wins easily

PROF.S.G.BHAT said...

1.Nxg6+ Qxg6
Alternatives make short work of black.
(a)1..... hxg6 2.Rh3+ Qh7 3.Rxh7+ Kxh7 4.Qxg6+ Kh8 5.Qh7#
(b)1.... Kg7 2.Nxf8+ Kh8 3.Ng6+ Kg7 4.Ne7+ Kh8 5.Qxg8#
In these lines .... Qxg6 any time may transpose to main line.
2.Rxf8+ Kg7
3.Bxg6 hxg6

White has got Q for 2 minor pieces from given position but for R and B in reality.the passed pawns are source of worry.
4.... Kxf8

4.... a2 5.Ra8 Rb1+ 6.Kh2 a1=Q 7.Rxa1 Rxa1 8.Qxe6 is weak for black as another P is likely to fall soon.
5.Qf3+ Ke7
6.Qxa3 Rc2
7.Qg3 Be8
8.Qg5+ Kd7
9.h5 gxh5

white's h5 is for clearing the diagonal h7-b1 in order to fork K and r in some cases.If 9.... g4 10.h6 can be winning line.
10.Qg7+ Kd8
11.Qg8 Rc3

Here black K can not support P as 11.... Qd7 or ....Qe7 is met by 12.Qh7+ winning R.however Rc1+ 12.Kh2 Kd7 13.Qg7+ Kc8 14.Qh6 attacking R wins e pawn.
12.Qxe6 d4
13.Qd6+ Kc8
14.e6 Bb5
15.Qb6 Be8
16.e7 Rc1+
17.Kh2 Ba4
18.Qd8+ Kb7
19.e8=Q Bxe8
Still lot of play is left but I can not visualize all possibilities. My lines look to me like more of speculation rather than analysis.

Yancey Ward said...

This puzzle is vaguely familiar to me, but isn't in my notes, but one move is pretty obvious to me right at the start, though things are a bit more complicated than I first thought after black takes at g6 with the queen:

1. Ng6! Qg6!(alternatives later)
2. Rf8! Kg7
3. Bg6!

And now, black can't take the rook:

3. ......Kf8?
4. Qf3

I think white wins with Qf4 followed by Qf7+, too, but I like the line where white takes at a3 on move 5 better since it is just less complicated- I keep thinking I am overlooking something in 4.Qf4, and it is bothering me. Continuing:

4. ......Ke7 (mate otherwise)
5. Qa3

Attacks the rook, too, plus it is threatening Qxc5+ winning the bishop. With b1 and c2 still covered by white's hanging bishop, all I can think of here is to play the rook to either b4 or e2/d2:

5. ......Rb4

Or [5. ...Re2 6.Qc5 Kd8 7.Qb6 Kc8 8.h3 hg6 9.Qb5+-]. Continuing:

6. Qa7! Bd7 (Kd8 7.Qb6+-)
7. Qc5 wins easily.

So, let's return to black's third move in the following line, and take the bishop instead:

1. Ng6 Qg6
2. Rf8 Kg7
3. Bg6 hg6!

This move only looks bad- one can easily overlook that the rook can't be saved since white has to deal with the weak back rank now that the bishop has gone to heaven. Continuing:

4. h4

I think this is the best way. It advances the pawn further than the simple h3 and also takes away the g5 square from the black king in one of the variations I found below. White surely has the upper hand right now, but the question is, is it enough? White is going to win the a-pawn since black must take the rook either now or after playing Rb1+ first. Continuing:

4. ......Kf8
5. Qf3!

I think white must eliminate the a-pawn now. If he takes at g6/e6, black pushes a2 and I can't see any way white can win and will be forced to try for a draw by repetition. With the a-pawn gone, white will be in a position to go for a win:

5. ......Kg7

Hard to say where the king should go here. I guess I don't like any of the options so I am opting to protect the g-pawn with the king. Continuing:

6. Qa3 Rb1

I don't like Rc2 here: [6. ...Rc2?! 7.Qa7! Kf8 (or 7. ...Kh6 8.Qb8! with the double threat of Qxb5 and Qh8#) 8.Qh7 Rb2 9.Qg6 and this should be decisive]. Continuing:

7. Kh2 Be8 (c4? 8.Qe7!+-)
8. Qc5 Bf7
9. Qe7

Advancing the pawns (and the white king!) on the black king right now might well be equivalent- black can't advance the d-pawn without losing it since black can't use the rook to protect it from in front, and can't maneuver the rook to d5 to do so from behind. I think white's edge is decisive now. However, I would have to think a bit longer to decide on how best to proceed from here.

Finally, at move 1, black is going to get mated if he doesn't take with the queen at g6 (why Ng6 caught my eye immediately):

1. Ng6 Kg7
2. Nf8 Kh8 (Kh6 3.Rh3#)
3. Qg8! Kg8
4. Ne6! and there is no defense stopping Rf8#.


1. Ng6 hg6
2. Rh3 Qh7 (Kg7 3.Qg6#)
3. Rh7 Kh7
4. Qg6 with mate on the next move.

Anonymous said...

1. Nxg6+!
A) 1. ......hxg6 2. Rh3+, Kg7 3. Qxg6#
B) 1. ......Qxg6 2. Rxf8+, Qg8 3. Qxg8#
C) 1. ..... Kg7 2. Nxf8+, Kh8 3. Ng6+, Kg7 4. Ne7+, Kh8 5. Qxg8#
D) 2. Nxf8+, Kh6 3. Rh3#

CraigB said...

1. N:g6+ Q:g6

1...hg 2. Rh3+ followed by 3. Q:g6+ wins.

2. R:f8+ Kg7
3. B:g6 hg
4. h4 K:f8 and White is winning.