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Peter Danenhower vs Boris Spassky
9th Canadian Open (1971), Vancouver CAN, rd 1, Aug-24
Benoni Defense: Fianchetto Variation. Hastings Defense (A63)  ·  0-1

ANALYSIS [x]

FEN COPIED

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 2 OF 2 ·  Later Kibitzing>
Feb-02-17  coolknight: Got the first move and figured responses for 28. NxNe3 and 28. RxNe3 but didn't find the continuation after 28. Qxe3
Feb-02-17
Premium Chessgames Member
  agb2002: The material is identical.

The square g3 is defenseless. This suggests 27... Ne3+:

A) 28.Nxe3 Qxg3+ 29.Kf1 Bh3+

A.1) 30.Rxh3 Qg1#.

A.2) 30.Ng2 Bxg2+ 31.Qxg2 Qxg2+ wins.

A.3) 30.Qg2 Qxf3+ is again a massacre.

B) 28.Qxe3 Qxg3+ 29.Kf1 Bh3+

B.1) 30.Ke2 Rxf3

B.1.a) 31.Qxf3 Bg4 pins the queen and wins decisive material.

B.1.b) 31.Rxh3 Rxe3+ 32.Rxe3 (32.Nxe3 Qxh3 - + [Q+P vs N]) 32... Qg1 - + [Q+P vs R+N].

B.1.c) 31.Qh6 Qg2+ wins.

B.2) 30.Rxh3 Qxh3+

B.2.a) 31.Kf2 Rg2+ and mate in two.

B.2.b) 31.Ke2 Rg3 wins decisive material due to the pinned bishop.

B.2.c) 31.Ke1 Rg3 as above.

C) 28.Rxe3 Qxg3+ 29.Kf1 Bh3+ wins as in A.

D) 28.Kf2 Nxd1+

D.1) 29.Rxd1 Qxg3+ 30.Ke3 (30.Kf1 Qg1#) 30... Bg4 31.Rf1 Rgf7 winss the bishop.

D.2) 29.Qxd1 Qxg3+

D.2.a) 30.Kf1 Bg4 wins the bishop.

D.2.b) 30.Ke2 Rxf3 31.Rxf3 Bg4 32.Rf1 Rf7 33.Ke3 Qf4+ wins decisive material. Or 33... Rxf3+ 34.Rxf3 Qxf3+ 35.Qxf3 Bxf3 36.Kxf3 Kg7 and the black king can stop the d-pawn but the white king cannot stop both the c- and h-pawns.

D.2.c) 30.Ke3 Bg4 as in D.2.a.

E) 28.Kh2 Qxg3#.

F) 28.Kg1 Qxg3+ 29.B(Q)g2 Qxg2+ 30.Q(B)xg2 Rxg2#.

Feb-02-17
Premium Chessgames Member
  agb2002: The text 29... Bg4 is much better than my 29... Bh3+ according to Stockfish.
Feb-02-17  Sularus: g3 is weak. pile up on it starting with a knight sac
Feb-02-17  gofer: Pg3 is the target. Ng4 is the cannon fodder...

<27 ... Ne3+>

Option 1
---------
28 Nxe3 Qxg3+
29 Kf1 Rxf3+

Option 2
---------
28 Qxe3 Qxg3+
29 Kf1 Bg4

30 Qf2 Rxf3
31 Rxf3 Qxf3
32 Qxf3 Bxf3

30 Rg1 Rxf3+
31 Qxf3 Qxg1+
32 Kxg1 Bxf3+

Option 3
---------
28 Rxe3 Qxg3+
29 Kf1 Bg4
30 Rg1 Qxg1+
31 Kxg1 Bxf3+
32 Kf1 Bxe2+
33 Kxe2 Rg2+

Option 4
---------
28 Kf2 Qxg3+
29 Kxe3 Bg4
30 Rf1 Qf4+
31 Kd3 Bxf3

Option 5
---------
28 Kg1 Nxe1
29 Qxe1 Qxg3+
30 Kf1 Bg4

~~~

Yep!

Feb-02-17  AlicesKnight: Found the main moves here. Interesting that the Black N is a minus not a plus in the position.
Feb-02-17  cocker: Peter Danenhower's 15 minutes of fame. His only game in this collection.
Feb-02-17  saturn2: I wemt for 27..Nh2. It is no check so not as forced as Ne3 and i am not sure if the move works after all.
Feb-02-17  Geronimo: A lovely, fun puzzle. I think I'll give myself a half point for getting as far as 29. Kf1, after which I got lost in the erroneous 29...Bh3, thinking there just had to be a mate in there somewhere. The text move demonstrates the brilliant calculating power. Thanks chessgames for giving us Spassky Week.
Feb-02-17  tivrfoa: Does 27. .. Nh2 work?
Feb-02-17  goodevans: What happens if <31.Ke1>?
Feb-02-17  5hrsolver: 27...Nh2 28.Qf2
Feb-02-17  saturn2: <5hrsolver> 28..NxBf3 RxN 29 Bg4
Feb-02-17  YetAnotherAmateur: <tivrfoa> I looked at 27. ... Nh2 for a while. It's definitely immune from capture: 28. Kxh2?? Qxg3# and 28. Rxh2? Qxg3+ 29. Kh1 or Kf1 Qg1# And of course it threatens Nxf3 as well.

However, white has the option of ignoring the knight and defending against the real threat on g3 with 28. Qf2, 28. Bh5, and 28. Rg1. Of those, I'd probably play Bh5 with the longer-term plan of Rxh2 (now possible because g3 is protected by the Ra3) and Rf3 (now possible because the Rh2 protects the bishop on h5).

Feb-02-17
Premium Chessgames Member
  kevin86: Nice finish 4 black!
Feb-02-17  swclark25: <agb2002 This suggests 27... Ne3+: A) 28.Nxe3 Qxg3+ 29.Kf1 Bh3+
A.1) 30.Rxh3 Qg1#.>

I also went with these moves thru 29)..Bh3+. I can't see checkmate with 30)..Qg1+ since 31)Qxg1. Looks like 30)..Qxh3+ is best and should be winning. Am I missing something?
Feb-02-17  DrGridlock: < swclark25: <agb2002 This suggests 27... Ne3+: A) 28.Nxe3 Qxg3+ 29.Kf1 Bh3+ A.1) 30.Rxh3 Qg1#.>
I also went with these moves thru 29)..Bh3+. I can't see checkmate with 30)..Qg1+ since 31)Qxg1. Looks like 30)..Qxh3+ is best and should be winning. Am I missing something?>

I looked also at the Bh3+ line for Black. As you state, "It should be winning" ... but as computer analysis shows,it is not. Position is approximately level after:

31 Ke2 Rg3
32 Qf2

with evals of around +.10

White has a knight and a bishop in exchange for a rook and a pawn and his king is safely shielded from Black's rooks and queen.

Feb-02-17  ChessHigherCat: <Cheapo by the Dozen: In answer to <nalinw>'s question (Why not 30. Kd2?) -- in that line, White's bishop is pinned, and hence 30 ... Qg2+ works.> Right, I was thinking 30. Kd2 Qg2+ 31. Nf2 protects the rook on h1, but in fact that loses the Q after 31...Rxf3
Feb-02-17  schachfuchs: I went for 29...Rgf7. Is that also winning? For example 30.Ke2 Rxf3 31.Qxf3 (31.Qh6 Qg2+) Rxf3 32.Rxf3 Qg2+ 33.Nf2 Bg4 ....
Feb-02-17
Premium Chessgames Member
  mjmorri: Poor White, trying his very best to neutralize Spassky's attack. What at first sight appears to be the simple win of a pawn turns to be far worse. I do not think I have seen this kind of fork before with the Black Bishop ready to reload if Queens are exchanged.
Feb-02-17  YouRang: Thursday 27...?


click for larger view

I thought this to be a tad easyish for a Thursday, at least as far as finding the first moves.

It's the typical case where one side (black in this case) has all forces bearing down on the opposing king. A sacrifice to break down the defense is all that's needed. With that in mind, the move <27...Ne3+> is screaming to be played.


click for larger view

It puts white's king in check and it vacates g4 to open the Q+R battery to hit Pg3.

The N can be captured three different ways, but the threat of 28...Qxg3+ 29.Kf1 Bh3+ 30.Rxh3 Qg1# leaves white with really just one option: <28.Qxe3>, which guards g1. Then comes <28...Qxg3 29.Kf1>.


click for larger view

Here, the move that made sense to me was <29...Rgf7>, and there's nothing white can do to save the Bf3. The king needs to make a run for it: <30.Ke2 Rxf3>


click for larger view

It looks like white will have to surrender a Q for a R to stave off mate, e.g. 31.Qxf3 Rxf3 32.Rxf3 Bg4 to pin & win rook.

A (futile) effort to keep the queen may go like this: 31.Qg1? Rxa3! 32.bxa3 Qf3+ 33.Kd2 Rg8! 34.Qe1 (only move to avoid K+Q rook fork/pin) ...Rg2 35.Kc1 Qxa3+

Feb-02-17  benjaminpugh: So from the puzzle position, we're supposed to see the eventual bishop fork winning the knight? Can't say I did.
Feb-02-17  stst: Fail to find the most elegant line like the days before, and hard to deviate from the main line 27.....Ne3+. If so, then
(A)28.QxN Qxg3+ (also hard to deviate from this) 29.Kf1 (forced) now (i) Rxf3+
30.Ke2 (variant *) RxQ
31.RxR Qg2+
32.Kd2 c4+
33.KxP Rc7+
34.Kb3 QxR wins
(ii)...... Bh3+
30.Ke2 and flees - this line no good.
Variant (*):
30.Nf2 Bh3+
(a)31.Ke2 RxQ
32.QxR (if Kd3/d1 RxQ) RxR
33.Bg4+ ===> R/N lost
(b)31.RxB QxR+
32.Ke2 RxQ+
33.RxR Qg2
34.Rf3 Rg3
35.d6 (or Resign) QxR+
36.Kd1 Rg1+
37.Kd2 QxN+
38.Kc3 Qd4+
39.Kc2 QxP wins

(B) after 27....Ne3+
28.RxN Qxg3+ (same as before)
29.Kf1 Bh3+
30.Qg2 RxB+
31.RxR QxR+
32.Ke1 RxQ wins

(C)...
28.NxN Qxg3+ (same)
29.Kf1 RxN+
30.Qf2 QxQ#

Other alternatives for 27.....
The h-P march seems too slow, and
none of the diagonal sq. g5-c1 look attractive to the Black Q's landing. a5 -- Ba6 to deflect the White Q also seems slow. RxB appears too blunt....something seems just missing...

Feb-02-17  stst: The most notable (somewhat more elegant) is the Bg4 pin, other than that, the complexity drives out that kind of elegance we have in previous days.

Got the main line - esp. Ne3+ then QxN. The rest is actually not difficult.

Dec-24-17  tivrfoa: Thank you <5hrsolver> and <YetAnotherAmateur>.
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