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Mikhail Chigorin vs Semion Alapin
Match (1880), St. Petersburg RUE, rd 1, Oct-21
French Defense: Exchange Variation (C01)  ·  1-0

ANALYSIS [x]

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 2 OF 2 ·  Later Kibitzing>
Aug-31-17
Premium Chessgames Member
  ChessHigherCat: Okay, so if 26. Re3 Qd5 27. Bc4 Qh1+ 28. Ke2

Hot diggedy dang, I missed it!

Aug-31-17
Premium Chessgames Member
  FSR: I saw Re3, but it seemed awfully easy to be the solution.
Aug-31-17  Altairvega: I say 26.Re3 to avoid loss of the B and to limit the number of checks that black can give. Anyway if 26 ..Qh1+ 27 Ke2 if 26. ..Qg2+ 27 Ke1. If 27..Qh1+ 28 Ke2. Black has no more checks and will try to get off the pin of the black rook. Then I look the solution for the rest It comes as a surprise to me that white eventuall wins. I thought it a draw
Aug-31-17  Walter Glattke: 26.Re3 Qh1+ 27.Ke2 Qxh3 28.Bc4 Kf7!?
29.Qxb2+ Kf8 or 29.Kd2 Qh6 30.Qxb7+ Kf8
31.Qxa7!? Rxe3! Little white advantage then.
Aug-31-17  diagonalley: i thought white could get away with 26.RxR ... presumably there is a refutation though(?)
Aug-31-17  scormus: Rxe6? Hmmm ...... with 2 # threats, it's easy to overlook .... Qxd3. I mean Qxd3+ .... or is that Qxd3+;)
Aug-31-17  Walter Glattke: c: I oversaw Pf5, combination not possible
Aug-31-17  AlicesKnight: Found the key of 26.Re3. White must prevent mate and save the B, and coverage of the e-file escape is necessary before the pin can be exploited.
Aug-31-17  jffun1958: 33. ... Kg5(h5) it's 4-mate:
34. Qxf5+ Kh6 35. Qh7+ Kg5 36. Qxg7+ Kf4 (36. ... Kh4(h5) 37. Rh8#) 37. Rf8#
Aug-31-17
Premium Chessgames Member
  patzer2: I thought ((26. ?) was fairly easy for a Thursday puzzle.

The only problem was ruling out 26. Rxe6? which gives Black a strong advantage after 26. Rxe6? Qxd3+ 27. Re2+ [] Kf8! 28. Qb4+ (28. Qa3+ Qd6 ∓; not 28. Qxb7?? Qxh3+ 29. Ke1 Qh1+ 30. Kd2 Rd6+ 31. Ke3 Qe4#) 28...Rd6! ∓ (-1.25 @ 35 depth, Stockfish 8.)

So that left the in-between move <26. Re3!,> saving the Bishop while still leaving the pinned Black Rook under attack, to consider.

What I had calculated was 26. Re3! Qg2+ 27. Ke2 Kf7 (27...Qd5 28. Bc4 +-) 28. Bc4 +-.

However, after the game moves <26. Re3! Qg2+ 27. Ke1 +->, I thought I might have made a mistake.

Upon checking with the computer it turns out 27. Ke2 is Just as strong and perhaps even stronger than 27. Ke1, as Stockfish 8 @ 34 depth gives 27. Ke2 a slightly higher assessment:

[Stockfish 8 64] 34:+5.92 <27.Ke2> Kf8 28.Rxe6 Rxe6+ 29.Qxe6 Qg6 30.Qc8+ Qe8+ 31.Qxe8+ Kxe8 32.Bxf5 h6 33.Kf3 Ke7 34.Kg4 b6 35.Be4 Ke6 36.Bxc6 Ke5 37.Bb7 Kf6 38.Ba6 Ke6 39.Bc4+ Kf6 40.Bb5 Ke5 41.Bd3 Kf6 42.Be4 Ke6 43.Kh5 Kf6 44.Bd3 Kf7 45.Bc4+ Kf6 46.Bb5 Kf5 47.Bc6 Ke6 48.Kg6 Kd6 49.Bb5 Kd5 50.Kh5 a5

[Stockfish 8 64] 34:+5.11 <27.Ke1> Kf8 28.Rxe6 Rxe6+ 29.Qxe6 Qg6 30.Qc8+ Qe8+ 31.Qxe8+ Kxe8 32.Bxf5 g6 33.Bd3 Ke7 34.Ke2 Kf6 35.Kf3 Kg5 36.Kg3 Kh5 37.h4 Kh6 38.Kg4 Kg7 39.Kg5 h6+ 40.Kf4 Kf6 41.Be4 a6 42.Bd3 a5 43.a4 b6 44.Bc4 c5 45.Bd3 Ke6 46.Bxg6 c4 47.Be4 Kf6 48.Bd5

P.S.: Black's decisive mistake was 25...Qxf3?, allowing 26. Re3! +-. Instead, the computer finds the strong drawing resource 25...Qd2! =. After the Stockfish 8 line 25...Qd2! 26.Rxe6 Qxd3+ 27.Re2+ Kf8 28.Qxb7 Qd1+ 29.Re1 Qd3+ 30.Re2 = (0.00 @ 34 depth,) it's a draw by repetition.

Aug-31-17
Premium Chessgames Member
  malt: First looked at
26.R:e6 Q:d3+ 27.Re2+ Kf8/Kh8

But 26.Re3 Qg2+ (26...Qh1+ 27.Ke2)27.Ke1

Aug-31-17
Premium Chessgames Member
  bubuli55: Deviated from text

32.Qf8+ Kg6

33.Qf5+ Kh6

34.Qh7+ Kg5

35.Qf5+ Kh6 or Kh4

36.Rh8#

Aug-31-17  saturn2: 26 Re3 was my choice. The rook on e6 remains pinned and the endangered white king gets the two squares e1 and e2 to hide.
Aug-31-17  Marmot PFL: black is threatening Qh1# as well as Qxd3+. 26 Re3 meets both threats and Re6 is still pinned.
Aug-31-17  goodevans: Did CG.com intend us to fall for the beguiling but mistaken <26.Rxe6 Qxd3+ 27.Re2>? Was that the point of the puzzle?

I'm afraid it didn't work on me as I saw straight away the strength of <26.Re3> and stopped looking, wondering instead why we had such a simple puzzle on a Thursday. Maybe if I'd looked harder for a better move than 26.Re3 I might have fallen for it!

Aug-31-17
Premium Chessgames Member
  Jimfromprovidence: There is an attempt at a rook trap in one reasonable variation, after 26 Re3 Qh1+ 27 Ke2 Kf7 28 Bc4 Kf6 29 Bxe6 f4, below.


click for larger view

White to play and win.

Aug-31-17  samvega: An example of a "co-linear" move, a term coined by Nunn (if I remember correctly). The idea is that when a long range piece can make a capture further down the board, some players tend to evaluate the capture only, and overlook the intervening (or co-linear) non-capturing moves.
Aug-31-17
Premium Chessgames Member
  ChessHigherCat: < samvega: An example of a "co-linear" move, a term coined by Nunn (if I remember correctly). The idea is that when a long range piece can make a capture further down the board, some players tend to evaluate the capture only, and overlook the intervening (or co-linear) non-capturing moves.>

That's interesting, it sounds like it's straight out of cognitive psychology: we're instinctively programmed to reach and grab the banana and we're not used to stopping short of them :-)

Aug-31-17  RandomVisitor: After 23.Qb3 black has Qg5!


click for larger view

Stockfish_17081107_x64_modern: <1.5 minutes computer time, 8 cores>

<-4.76/34 23...Qg5+ 24.Kh1 Rff6> 25.Re1 Rg6 26.Qxe6+ Rxe6 27.Rxe6 Qd2 28.Bc4 Kf8 29.Kg2 Qg5+ 30.Kf1 Qf4 31.b3 Qxf3 32.Re3 Qh1+ 33.Ke2 f4 34.Rf3 g5 35.b4 Qb1 36.Kd2 Qe4 37.Be2 Qd5+ 38.Ke1 Qxa2 39.Bd1 Qd5 40.Be2 Ke7 41.Rd3 Qh1+ 42.Kd2 Qg1 43.Rf3 Qb1 44.h4 Qa2+ 45.Ke1 gxh4 46.Rxf4 Qb1+ 47.Kd2 Qg6 48.Rf3 Qg2

Aug-31-17  morfishine: <26.Re3> solves everything
Aug-31-17  RandomVisitor: After 21...Rd6 perhaps winning is 22.Re3


click for larger view

Stockfish_17081107_x64_modern: <1.75 hours computer time, 8 cores>

<+4.87/47 22.Re3 Qg5+ 23.Kh1> Kh8 24.f4 Qxf4 25.Qe2 Rd7 26.Re8 Rd8 27.Re1 Rdxe8 28.Qxe8 Rg8 29.Kg2 Qg5+ 30.Kf3 Qh6 31.Bxf5 g6 32.Qe5+ Qg7 33.Qxg7+ Kxg7 34.Bc2 Rf8+ 35.Kg3 Rf7 36.Bb3 Rd7 37.Rd1 Re7 38.Rd6 Kf8 39.Kf3 Kg7 40.Kg4 c5 41.Be6 b6 42.Kf4 Kf6 43.Bd5+ Kg7 44.Bb3 Kh6 45.Be6 Kh5 46.Ke5 Kh4 47.Rd1 Kg5

Aug-31-17  Cheapo by the Dozen: <Jimfromprovidence>,

I'm not sure why the capture at e6 in your line was with the bishop, but anyway Bg4 is an appealing followup because of the mate threats.

Aug-31-17
Premium Chessgames Member
  Jimfromprovidence: <Cheapo by the Dozen> <I'm not sure why the capture at e6 in your line was with the bishop, but anyway Bg4 is an appealing followup because of the mate threats.>

Because it's a credible (maybe best) move in that position. Anyway, your response 30 Bg4 is surely winning and in line with what I discovered, another bishop move,30 Bf7.


click for larger view

In any case, black cannot take the rook with his pawn in either scenario because of the mate threat beginning with 31 Qe6+.

Aug-31-17  NBZ: <goodevans> That must be it. For my part, at least, I spent much time looking at Rxe6 before realizing that Re3 does it.
Sep-01-17
Premium Chessgames Member
  kevin86: White must chase the queen before proceeding.
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