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Michael Rohde vs Ian Rogers
10th World Open (1982), Philadelphia, PA USA, Jul-??
Gruenfeld Defense: General (D80)  ·  0-1



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sac: 17...Bb6 PGN: download | view | print Help: general | java-troubleshooting

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 2 OF 2 ·  Later Kibitzing>
Apr-10-08  NotABanker: I don't know I saw that pretty fast more like a Tuesday.
Apr-10-08  johnlspouge: Thursday (Medium): Black to play and win.

Material: Down a P for a B. The Black Rc8 and Rf8 both have open files facing the White Rs. The Rc8 pins Bc6 against the unprotected Rc1. The Black Qg4 can capture Bh4 to restore material balance, but has activity in other directions, e.g., it presently takes several light squares away from Ke1. Thus, it complements the dark-square Bb6, which attacks Pe3 and Pf2. An examination of checks, captures, and threats reveals the candidate.

Candidates (19…): Qb4+


Black has 2 feasible responses: (1) 20.Ke2 and (2) 20.Kd1

(1) 20.Ke2 Qb2+ 21.Kd3 [21.Kd1 Rd8+ 22.Ke1 Qd2#]

21…Rcd8+ 22.Ke4 [Kc4 Qe2+ skewers Qa6]

22…Rd4+ 23.exd4 [Ke5 Rd5+ 24.K moves Qe5#]


(2) 20.Kd1 Rcd8+ 21.Ke2 [Kc2 Rd2#] Qd2#

Apr-10-08  johnlspouge: <<AniamL> wrote: after 22.Kc4 [snip] 22... Rf4! 23. [any] Rd4#>

Like <dzechiel>, I went for the skewer of Qa6 rather than mate, although I was aware I was being lazy. As a friend, a professional piano-player, once said to me: "Always play your best, because you never know who is in the audience." Thanks for keeping us sharp, <AniamL>.

Apr-10-08  Catenaccio: I restarted playing the chessgames-puzzles since I desperately need tactical training. So I decided to play them against Fritz with an half hour each. That helps to eliminate the whole "did I actually see this move when I started?" question and the time pressure is not a bad training. Unfortunately today Fritz played 21.Ke2 maybe because this leaves him with more moves to go. Is there actually a way to make him play the toughest lines, which might be those where he choses to make me sacrifice? What do you think of the idea overall? Any suggestions for improvement?
Premium Chessgames Member
  benveniste: I got trapped by "puzzle mentality." Since it was a puzzle, I ignored the check and spent the better part of 15 minutes looking at 19. ... ♖xc6??.
Apr-10-08  012: Wednesday puzzle <35. ?> Apr-09-08 Karpov vs Piskunov, 1962
Apr-10-08  whiteshark: Today <19...Qb4+ 20.Ke2 Qb2+> was good enough for me.
Apr-10-08  Samagonka: <erimiro1> wrote: Also deadly and more elegant: 19.-B:e3. I totally agree with that.
Premium Chessgames Member
  Jimfromprovidence: I chose the pedestrian 19 ...Qxh4, which wins a couple of pawns.

Oh well!

Apr-10-08  kevin86: I figured this one out. It was clear that the right move was not the reflexive capture of the bishop,but an attack on the exposed white king. The defenders had no job but to sit and wait as the king was captured.
Apr-10-08  A.G. Argent: Looks like the Rohde to Oblivion began when he opted for the pawn on 14.cxd4 instead of castling. Would the passed pawn have been that much of a bother at that point? Seems as though protecting the g2 pawn and the bloody King by castling would have served him better. But the ensuing mating attack by Mr. Rogers is little short of exquisite, ain't it, expedited by 16...Bxd4, whether or not Rohde answered with 17.exd4. His King is fatally exposed, drawn out into the open and nastily dealt with by Roger's free ranging Queen. A lovely mate.
Apr-10-08  YouRang: After running my <19...Rfd8> idea into the computer, I see that white can counter with 20.Qa4 (threatening my queen).

But white still loses after 20...Qxa4 21.Bxa4 Rxc1+ (winning the exchange w/ check) 22.Ke2 (diagram)

click for larger view

22...Rc4! (forking both white bishops) 23.Bxe7 Rxa4 24.Bxd8 Bxd8 (picking up both bishops for a rook)

Thus, I go into the endgame up a full bishop, which should be an easy win for black.

Apr-10-08  MaczynskiPratten: <Samagonka>,<erimiro1>: I looked at Bxe3 but dismissed it as Qb4+ looked more forcing. Can you show a quick mate in all lines after 20 fxe3?
Apr-10-08  johnlspouge: <<MaczynskiPratten> wrote: [snip] Can you show a quick mate in all lines after 20 fxe3?>

Sadist ;>)

Apr-10-08  LPeristy: Wow, and here I am fooling around with Bxe3 lines.
Apr-10-08  wals: Static Evaluation: Black is down a white diag. bishop. Looks like a case of first in, best dressed.

Dynamic Evaluation: If Bb6 x e3 and pf2 x e3 then
Q x h4+ should be enough to solve this puzzle.


Damn, did not take into account after Bxe3...Rc4.

Apr-10-08  znprdx: Routine, nothing extraordinary except to check with the right (: rook
Apr-10-08  johnlspouge: Under my usual Mom-and-Pop evaluation scheme, Toga II 1.3.1 evaluates 19...Bxe3 as

[ply 15/53, time 02:29, value +0.59]

20.Rc4 Bd4 21.Bg3 Rcd8 22.f3 Qg5 23.f4 Qh5 24.Bf3 Qh3 25.Rc7 Kh8 26.Qa3 Rf7 27.Rxe7

To give lines to mate after 19...Bxe3 is not just hard, it is likely impossible...

Apr-10-08  wals: <Catenaccio> You can get all the tactical training you wish at or
And it's free.
Apr-10-08  ruzon: <NewLine: 16...Bxd4! Amazing!>

Yes, it is. I have 17. exd4 losing to 17...Qe4+ 18.Kd2 (not Kd1, 18...Qxd4+) Qf4+ (not Qxd4+, 19.Bd3) 19. Ke1 (19.Kd3 Nb4+ 20.Ke2 Rc2+ 21.Ke1 Qd2#) Nxd4 threatening Nc2+, Rc1+, and Qe5+.

Apr-10-08  TheaN: 3/4 thus far...

Err, I think you guys need to take a look at this.

19....Rxc6?! 20.Rxc6 (something better?) Rd8!

21.f3 Qb4+ 22.Rc3 Qxc3+ 23.Ke2 Qd2#

21.Qa4 Ba5+! 22.Qb4 (Qxa5 Qd1#) Bxb4+ 23.Rc3 Bxc3#

21.Rc1 Qb4+ 22.Ke2 (Rc3 Qxc3+) Rd2+ 23.Kf3 Qxh4... complex but not a clear win.

Anyone else any improvements?

Apr-10-08  TheaN: Hm. 3/4 for me:

Analysis by Fritz 11:
1....Rxc6 2.Rxc6 Rd8 3.Rc1

1. (-1.23): 3...Qb4+ 4.Ke2 Rd2+ 5.Kf3 Qxh4 6.Qc8+ Kf7 7.Qb8 Rd5 8.Kg2 Qe4+ 9.f3 Rd2+ 10.Kg3 Qxe3 11.Qf4+ Qxf4+ 12.Kxf4 Rxa2 13.h3 Ra4+ 14.Kg3 Be3 15.Rc8 Bf4+

2. (-0.99): 3...Rd5 4.h3 Qxh4 5.Ke2 Qh5+ 6.f3 Qxh3 7.Qc4 Qg2+ 8.Rf2 Qg5 9.Qb3 Re5 10.Rc3 Kg7 11.f4

3. = (0.00): 3...Qxh4 4.Rc8 Rxc8 5.Qxc8+ Kf7 6.Kd2 Qxh2 7.Qc4 Qh5 8.Qf4+ Ke8 9.Qc4 Kf7

4. (0.47): 3...Qh5 4.Rg1 Qxh4 5.Rc8 Qb4+ 6.Ke2 Rxc8 7.Qxc8+ Kf7 8.Qc6 Qb2+ 9.Kf3 Qxa2 10.Rd1 Qb2 11.Rd7 a5 12.Qc4 Qe5 13.Qf4+

Apr-10-08  jheiner: 19.Black to play. Black is a P up. White B on a4 and Black P on e7 are en prise. Black Q, Black R on c8 and White B on c6 are loose, as are several pawns. White's K is vulnerable and Black threatens Ba5# if the a5 square is unguarded.

Black is already 4 points up if he takes the B on h4, so there must be something better. After quite a bit of pounding in rank movement on the recent puzzles, 19.Qb4+ jumps out.

19...Qb4+ 20.Ke2 (20.Kd1 Rcd8+ 21.Ke2 Qd2#) Qb2+ 22.Kd3 (22.Kd1 Rd8+ 23.Ke1 Qd2#, or 22.Ke1 Qxc1+ wins a R plus) Rcd8+ 23.Ke4 (23.Kc4 Qe2+ skewers 24...Qxa6 and wins the Q) Rd4+ 24.exd4 (24.Ke5 Rf5#) Qxd4#

Well, that is the limit of my visualization, but this one came much more easily for some reason. Time to check.

Wow. I got it perfect, and caught all the lines. Especially proud of visualizing up to 23.Kc4 Qe2+ skewering the White Q. I think this is a first for me for Thursday. Thank you CG!

Apr-10-08  jheiner: <AniamL> thanks for the 23.Kc4 Rd4# line. I am still pretty happy to have simply won a Q, but mate IS better.

One thing I didn't see pointed out in the Kibitzing (correction <znprdx> pointed it out), it's important to play 22...Rcd8+, not 22...Rfd8+ to maintain the mating net.--despite the fact the Rcd8+ weakens the attack on the B on c6. Could be a case of the "wrong rook".

Apr-10-08  PinnedPiece: I was wondering why not 19. Qe7

then I saw the mate at 19 ..Ba5

maybe BFD but several months ago I would have had to ask why not....

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