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H Wernich vs James Mason
Clipper Free Centennial Tournament (1876), New York
Russian Game: Modern Attack. Center Attack (C43)  ·  0-1

ANALYSIS [x]

FEN COPIED

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Kibitzer's Corner
Nov-19-09  YoungEd: Interesting game! White's initial development looks threatening, but nothing come of it. I think that taking the pawn sac with 19. ♕xd7 was White's error, because that allowed Black to develop with a vengeange. Nice finish!
Dec-24-19  NBZ: <YoungEd>: 19. Qxd7 was risky, yes, but White had several chances to make it an even game. For example, the simple 22. Rbd1 activating the rook and trying to fight for the d5 square. I think White saw the danger posed by Black's activity, panicked, and played 22. Qh4? and 23. Bc4?
Dec-24-19  The Kings Domain: Nice puzzle and good game.
Dec-24-19
Premium Chessgames Member
  patzer2: For today's Tuesday puzzle (24...?), the sham Knight fork sacrifice 24...Nf3+ -+ wins the Queen or forces mate.

P.S.: Black's game goes bad after 22. Qg4?! Ng5! ∓ (-1.15 @ 22 ply, Stockfish 9).

Instead, 22. R(b1)d1 = (+0.07 @ 22 ply, Stockfish 9) is level.

Dec-24-19  Walter Glattke: Very EZ, merry Christmas!
Dec-24-19  malt: Nice finish 24...Nf3+ 25.gf3

(25.Kh1 N:h5 )

25...Q:f3 26.Re4 B:e4 27.Q:e4 Q:e4

Dec-24-19  saturn2: White can trade knight for queem
24...Nf3+ 25. Kh1 (gxf3 leads to mate) Nxh4 26. Bxh4 
Dec-24-19
Premium Chessgames Member
  agb2002: Black has a bishop and a knight for the bishop pair.

White threatens Qxg5.

Black can weaken the white castle decisively with 24... Nf3+ 25.gxf3 (25.Kh1 Nxh4 wins) 25... Qxf3 and White will lose the queen and a rook for the black bishop to stop mate.

Dec-24-19  lost in space: 24. Nf3+ wins
Dec-24-19  mel gibson: Very easy but it's not a forced mate -
it is a forced loss of the White Queen.

Stockfish 10 says:

24... Nf3+

(24. .. Nf3+
(♘g5-f3+ ♔g1-h1 ♘f3xh4 ♗g3xh4 g7-g5 ♗h4-g3 f7-f5 f2-f3 f5-f4 ♗g3-f2 ♖d2xf2 ♖e1-e5 ♕c6-g6 ♗f1-c4+ ♔g8-h8 ♖b1-g1 ♖f2xb2 ♖e5-e2 ♖b2xe2 ♗c4xe2 ♕g6-c2 ♗e2-d1 ♕c2xc3 h2-h3 ♖f8-e8 ♔h1-h2 ♕c3-b2 ♗d1-a4 ♖e8-e7 a2-a3 ♗b7xf3 ♗a4-d1 ♗f3-b7 ♗d1-h5 ♕b2-f2 ♗h5-g4 ♕f2-g3+ ♔h2-h1 ♖e7-e1 ♗g4-f3) +21.40/36 840)

score for Black +21.40 depth 36

Dec-24-19  Damenlaeuferbauer: After long pondering, the great Irish chess player James Mason finally found 24.-,Nf3+! 25.gxf3 (25.Kh1,Nxh4) 25.-,Qxf3 with mate next move.

Merry Christmas to every real and true chess player!

Dec-24-19  Whitehat1963: Humbled Humbled.
Dec-24-19  AlicesKnight: Found it quickly (again; good for me - it's Christmas).
Dec-24-19  zb2cr: The mating square at g2 is covered by White's Bishop. So, how can we shift the mating square? 24. ... Nf3+!

Now, White has two moves to get out of mate. 25. Kh1 loses the Queen. 25. gxf3 is worse, because 25. ... Qxf3 exposes him to mate at h1. White can avoid mate at ruinous material cost, as pointed out by <agb2002>: 26. Re4, Bxe4; 27. Qxe4, Qxe4; 28. Rc1, R8d8 with a simple path to victory.

Dec-24-19  DrGridlock: Key to the puzzle is finding that the queen can deliver mate on either g2 or on h1. The knight fork on f3 delivers check and attacks the queen. If white gets out of the fork with gxf3, then after … Qxf3 white can protect g2, or f1, but not both.
Dec-24-19  ndg2: <Whitehat1963: Humbled Humbled> I see what you did there
Dec-24-19
Premium Chessgames Member
  thegoodanarchist: As Jerry from chessnetwork says, "Tricky Knight!"
Dec-24-19  Whitehat1963: <ndg2> I’m glad someone can follow my scrambled thoughts!
Dec-24-19
Premium Chessgames Member
  patzer2: Instead of 23. Bc4?, allowing 23...Qc6 -+, White can equalize with 23. Qc4 = (-0.18 @ 22 ply, Stockfish 10).
Dec-24-19
Premium Chessgames Member
  patzer2: Oops! It's not quite equal after 23. Qc4 c5 24. Qf1 Ne4! ∓, but it's still better than losing on the spot with 23. Bc4? Qc6 -+.

For a fully level position, White needs to go back one move and play 22. R(b)d1 =.

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