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Ariel Mengarini vs Glenn E Hartleb
49th US Open (1948), Baltimore, MD USA, rd 2, Jul-06
Italian Game: Giuoco Pianissimo. Normal (C50)  ·  1-0

8
7
6
5
4
3
2
a
1
b
c
d
e
f
g
h
White to move.
ANALYSIS [x]
1-0

rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1
FEN COPIED

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Kibitzer's Corner
Sep-01-23
Premium Chessgames Member
  chrisowen: Lew its honey I cus mojo drank Nxf6 its a cig mug Nxf6 over;
Sep-01-23  agb2002: The first idea that comes to mind is 33.Rxf6 but Black has 33... Rxd5 (33... gxf6 34.Nxf6 wins decisive material to stop mate) 34.Rf7 Rg5.

Therefore, 33.Nxf6 gxf6 34.Qxh6+ Kg8 35.Rxf6 wins decisive material (35... Rc7 36.Rg6+ Kf7 37.Rg7+ and mate next).

Sep-01-23  mel gibson: I thought that was easy.

Stockfish 16 shows that to avoid a quick mate Black must give up its Queen:

33. Nxf6

(33. Nxf6 (Nd5xf6 Qd8xf6 Rf1xf6 Rc5-g5 Qg6-f7 g7xf6 h2-h4 Rg5-g7 Qf7xf6 Kh8-h7 Rb2-f2 Ra8-g8 e4-e5 Na5-b3 e5xd6 Nb3-c5 Rf2-e2 Nc5-d7 Qf6-f5+ Kh7-h8 Re2-e7 Rg7xg2+ Kg1-f1 Rg8-f8 Qf5xf8+ Nd7xf8 Kf1xg2 Kh8-g8 d6-d7 Nf8xd7 Re7xd7 Kg8-h8 Rd7xb7 h6-h5 Rb7xb6 Kh8-h7 Rb6-b8 Kh7-g7 b5-b6 Kg7-h7 Rb8-f8 Kh7-g7 Rf8-d8) +34.29/41 382)

score for White +34.29 depth 41.

Following the game line:

33. Nxf6 gxf6
34. Qxh6+

(34. Qxh6+ (Qg6xh6+ Kh8-g8 Qh6-g6+ Kg8-h8 Rf1-f4 f6-f5 Qg6-h6+ Kh8-g8 e4xf5 Rc5xf5 Qh6-g6+ Kg8-h8 Rf4xf5 Qd8-h4 Rb2-f2 Ra8-g8 Rf5-h5+ Qh4xh5 Qg6xh5+ Kh8-g7 Rf2-f7+) +M11/94 45)

White wins _ mate in 11.

Sep-01-23  jffun1958: 36...Rc7 and 2-mate:
36...Rc7 37. Rh3+ Rh7 38. Qxh7#
36...Qd7 and mated-in-11: \
mated-in-11 (40 ply) 36...Qd7 37.Qxf6+ Kh7 38.Rg3 Rh5 39.Qg6+ Kh8 40.Qxh5+ Qh7 41.Qg5 Rg8 42.Qf6+ Rg7 43.Rf2 Nc6 44.bxc6 bxc6 45.Ra2 d5 46.Ra8+ Qg8 47.Qxg7#
Sep-01-23  Brenin: 33 Nxf6 threatens 34 Qh7 mate, and 33 ... Qg8 or Qxf6 lose the Q for a N or N+R, while 33 ... gxf6 allows 34 Qxh6+ (clearing the h-file) Kg8 35 Qg6+ Kh8 (Kf8 36 Rbf2 with mate soon) 36 Rf4 with mate on the h-file to come. This is better than 36 Rf3 played, when Black can resist with Qd7, e.g. 37 Rh3+ Qxh3 38 Qxf6+ (not 38 gxh3 Rg5+ with advantage to Black) Kh7 39 gxh3, and White still has some work to do.
Sep-02-23  King.Arthur.Brazil: Well, after: 33. Nxf6 (Rg5 or similar 34. Qh7#) gxf6 34. Qxh6+ Kg8 35. Rxf6 Qe7 36. Rg6+ Kf7 37. Rf2+ Ke8 38. Re6 B can resign.

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