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James Kulbacki vs Benjamin Finegold
Super Double Tornados (1983), Ann Arbor, MI USA, rd 3, Oct-30
Vienna Game: Vienna Gambit. Modern Variation (C29)  ·  1/2-1/2

ANALYSIS [x]

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Kibitzer's Corner
Mar-05-06  Resignation Trap: Black missed a win with 39...Rxf3+! 40.Kxf3 g4+ 41. Kf4 (or 41.Kf2) h4!

Could one of our silicon analysts discover a forced mate in, oh, lets say, 73 moves in this Q+R vs. Q+R endgame?

Mar-05-06  Fan of Leko: <Resignation Trap> 39...Rxf3+! 40.Kxf3 g4+ 41. Kf4 h4! 42 c5 hg3 43 c6 g2 44 c7 g1(Q) 45 c8(Q) is a drawn Q and P ending because of the active white king. If you would resign that I would say you have found an accurate nickname :)
Mar-06-06  Resignation Trap: <Fan of Leko> I looked at that line and I assumed that 45...Qf1+ led to a winning endgame, as I believed that Q+gPawn vs. Q was win.

You forced me to consult an endgame book for the first time in years, and only then did I learn that this endgame is a draw, since White should always have a perpetual check.

Another gap in my endgame knowledge has been filled.

Oct-03-06  YouRang: According to the tablebase, 55. Ke6 gave Black a mate-in-19 (m19). After 55...Qg6+

56. Ke5 (best) Qg5+ (now m23 - ...Re3+ is m18)
57. Kd4 (best) Qf6+ (m22)
58. Ke4 (best) Qf3+ (now m23 - ...Qg6+ is m21)
59. Kd4 (best) Qf4+? (now a draw - ...Qf6 is m22)

Then comes a double blunder!
60. Kd5? (allowing m8! - needed Kc5!) Ra5+? (now a draw again - needed ...Rd3 for m8)

And the game remained a draw the rest of the way.

BTW, Black's win after 60...Rd3+ (diagram) might have gone like this:


click for larger view

if 61. Ke6: ...Rd6+ 62. Ke7 Qe5+ 63. Kf7 Rf6+ 64. Kg7 Qg5+ 65. Kh7 Rh6# -or
if 61. Kc5: ...Qd6! 62. Kb5 Rb3+ 64. Ka5 Qb6+ 65. Ka4 Qb5#

(There are other moves that allow white to last longer, but only if white surrenders material and accepts a clearly lost position).

Oct-04-06  Resignation Trap: <YouRang> Thanks for the analysis! I always suspected that Black missed something along the way, but Q+R vs. Q+R (no Pawns) can be really difficult for non-computers to calculate.
Oct-04-06  YouRang: You're welcome. :-)

As you say, it's a very tricky position for humans. I was hoping to find something instructive from the tablebase.

It appears to suggest that the correct general plan for the attacker (black in this case) is to is to separate the defending king from its Q+R, after which the Q+R can force mate astonishingly fast.

So, defensively, it makes sense to move your king and Q+R closer. Perhaps that idea might have helped you avoid the two potential losing moves 55. Ke6? and 60. Kd5? (in both cases, Kc5! was preferred).

Naturally, you've primarily got to be wary of the usual dangers: pins, skewers, double attacks, and the like.

Jul-20-10  elohah: James Kulbacki....

You know, chessplayers have a long memory. This is the guy who came down to a minor NE tournament one time, and tried to sandbag as an A-player.

HeŽs probably a strong expert in strength. I lost a better position to him from my then fav f3 Nimzo. If I had just blockaded his isolated d-pawn, rather than prematurely trying to win it, I would have been better, as he should know by now.

If he ever shows again, IŽll rip his nose off.

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