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Alexander McDonnell vs Louis Charles Mahe De La Bourdonnais
La Bourdonnais - McDonnell 5th Casual Match (1834), 06, rd 70
Sicilian Defense: McDonnell Attack (B21)  ·  0-1

8
7
6
5
4
3
2
a
1
b
c
d
e
f
g
h
White to move.
ANALYSIS [x]
Notes by Stockfish 9 v010218 (minimum 6s/ply) 8...Bd7 9.d4 O-O-O 10.a4 fxe5 11.fxe5 Be7 12.Kh1 cxd4 = -0.41 (20 ply)better is 9.exf6 gxf6 10.d4 Bd7 11.dxc5 Bxc5+ 12.Kh1 Bd6 13.a4 ⩲ +0.62 (21 ply)better is 9...fxe5 10.fxe5 Bd7 11.d4 g6 12.a3 Be7 13.b4 cxd4 = -0.08 (21 ply)better is 10.exf6 gxf6 11.d4 cxd4 12.cxd4 f5 13.Nc3 O-O-O 14.Na4 ⩲ +0.67 (23 ply)better is 10...cxd4 11.exf6 gxf6 12.cxd4 Nb4 13.Bb3 Bb5 14.f5 Bxf1 = +0.07 (20 ply)better is 11.exf6 Bxf6 12.dxc5 Qxc5 13.Nbd2 O-O 14.Nb3 Qd6 15.Be3 ⩲ +0.60 (23 ply) 11...fxe5 12.fxe5 Rc8 13.dxc5 Bxc5 14.Nbd2 O-O 15.Re1 = 0.00 (21 ply) 12.dxc5 Qxc5 13.exf6 Bxf6 14.a4 O-O 15.Na3 g6 16.Re1 Ne7 ⩲ +1.06 (22 ply)= 0.00 (21 ply) after 12...g6 13.dxc5 Qxc5 14.Qe2 fxe5 15.fxe5 Qb6 16.a4 O-O better is 15.Re1 g6 16.dxc5 Bxc5 17.Nf1 Ne7 18.Qd2 Qc7 19.Ng3 Ba7 = +0.35 (22 ply) 15...a4 16.bxa4 Qa5 17.Nb3 Qxc3 18.Bd2 Qc4 19.Nxc5 Bxc5 = -0.20 (22 ply) ⩲ +0.66 (24 ply) after 16.Re1 g6 17.dxc5 Bxc5 18.Nc4 Qa7 19.b4 Bxe3 20.Nxe3 better is 16...cxd4 17.Nxd4 Nxd4 18.Nf3 Nd8 19.Re1 Bc5 20.Nxd4 Nc6 = +0.32 (21 ply) 17.gxf5 gxf5 18.Rg1 Rg8 19.Qe2 Rxg1+ 20.Rxg1 Rg8 21.a4 ⩲ +0.95 (23 ply)= +0.05 (23 ply)better is 18.Nxd4 fxg4 19.Qxg4 Rg8 20.Qe2 Nxd4 21.Bxd4 Qd8 22.Nf3 = +0.36 (21 ply) 18...Na7 19.Nb1 Rc7 20.Bd3 Rac8 21.a4 Nh6 22.Rg2 Kg8 = -0.14 (23 ply) ± +1.65 (24 ply) after 19.Nf1 Rg8 20.Ng3 gxf4 21.Bxf4 Bg5 22.Qd2 Bxf4 23.Qxf4 20.Nf1 gxf4 21.Bxf4 Rg8 22.Ng3 Raf8 23.Nxf5 Rxg1+ ± +1.97 (22 ply) 20...Ncxe5 21.dxe5 Qxe3 22.Re1 Qb6 23.Nc4 dxc4 24.Qxd7 = 0.00 (26 ply) 21.Nh4 Ng6 22.Bxf5 Bxf5 23.Nxf5 Rf8 24.Rf1 Qc7 25.Qg4 ⩲ +0.78 (25 ply) ⩱ -1.02 (23 ply)better is 22.Re1 Rc3 23.Nb1 Bxg5 24.Nxc3 Qh6 25.Re2 Qxh3+ 26.Rh2 ⩱ -1.06 (20 ply) 22...Rc3 23.Qe1 Qc6 24.Qe2 Rc8 25.Rg2 Qe6 26.dxe5 Rxc2 ∓ -1.80 (23 ply) ⩱ -0.56 (23 ply)better is 23...Bd6 24.h4 Re8 25.Qd2 Re7 26.Bd1 Rae8 27.Bf2 Nf4 ⩱ -0.64 (20 ply) 24.Bc1 Bd6 25.Bb1 a4 26.Re2 Qf7 27.Bb2 axb3 28.Ne5 Bxe5 = -0.07 (22 ply)-+ -3.37 (23 ply) 27.Bd3 Qxe5 28.Rf3 d4 29.Bf4 Qc5 30.Kg1 Bc6 31.Raf2 Bd6 -+ -2.82 (22 ply) 27...d4 28.Qxd4 Rxb3 29.Bxf5 Bc6+ 30.Kh2 Qxf5 31.Rf2 Qe6 -+ -5.91 (24 ply) 28.Rag2 Bxa3 29.Rg1 Bg6 30.Bf4 Bc1 31.Qd4 Rxg3 32.Rxg3 ⩱ -1.46 (23 ply) 28...d4 29.Qxd4 Rxe3 30.Qxe3 Bc5 31.Bxf5 Bxe3 32.Bxe6 -+ -2.86 (26 ply) 29.Kg2 Bxa3 30.Bf4 d4 31.Rxc3 dxc3 32.Ra2 Be7 33.Bc2 Be8 ⩱ -1.36 (23 ply)-+ -4.50 (24 ply) after 29...Bxg5 30.Rxg5 Rxe3 31.Bxf5 Qxe5 32.Bxc8 Re1+ 33.Rg1 30...Bxg5 31.Rxg5 Rxe3 32.Bxf5 Qxe5 33.Bxc8 Re1+ 34.Rg1 -+ -4.73 (24 ply)-+ -2.65 (25 ply) 34...d4 35.Bd3 Qb3 36.Bf1 Qe3 37.Rcc2 d3 38.Rcd2 f4 -+ -3.50 (23 ply) ⩱ -0.85 (24 ply) 36...Be8 37.Rg2 b5 38.Bd3 Qd6 39.Rg4 Bd7 40.Rgf4 Be6 ⩱ -1.38 (26 ply)= -0.18 (29 ply) 40.R1f7+ Kh6 41.Rd7 Kg5 42.Rfd8 Qe3+ 43.Kg2 Qe2+ 44.Kg3 = 0.00 (25 ply)-+ -132.65 (29 ply)-+ mate-in-48 after 46.Kc249.h4 b6 50.Kc2 Ka4 51.Kc3 b5 52.Kb2 Kb4 53.Ka2 Kc3 -+ mate-in-260-1

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

Annotations by Stockfish (Computer).      [35437 more games annotated by Stockfish]

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Kibitzer's Corner
Aug-02-04  Knight13: OOO! White can't stop the pawn from promoting.
Oct-12-04
Premium Chessgames Member
  wwall: 29.Bf4 instead of 29.b4 probably fails to 29...Rxg3 30.Bxg3 Bxg5, threatening 31...Rc1

Without 32.Re1, Black would play Rc1, winning the Queen for Rook.

32...Bh4 also looks good, winning the exchange

Perhaps 35.Rfc2 is better than 35.Rcf1 so that White can take the open file.

Maybe 39.R5f4 is better than 39.Rf8+

40.R1f6?? looks bad. Maybe 40.R8f4 or 40.R8f7+ can draw

40...Qd4+! is better than 40...Qxb4? 41.R6f7+ Kg6 42.Rf6+ Kg5 43.Rf5+ Kg6 44.R5f6+ and draw by perpetual check

Faster seems 43...Kg5 44.Ke3 Kh4 45.Kxe3 Kxh3 46.Ke3 Kg3 47.Ke2 Kg2 and the black rook pawn queens after ...h5-h4-h3-h2-h1=Q

After 49.Kc3 Kc5 50.Kd3 Kd5 51.Ke3 Ke5 52.Kf3 Kf5 53.Kf2 Kf4 54.Kg2 h4 55.Kf2 b5 and Black easily wins

Aug-29-06  sneaky pete: After 26.Rg3 .. white's rooks are a sorry pair. 26... f4! suggested by St Amant looks immediately winning (27.Bxf4 Rxg3 28.Bxg3 Qxh3+ 29.Bh2 Bc6 and if 30.Qd4 Qf3+ 31.Kg1 Bxg5).
Feb-25-08  wolfmaster: Power to the pawns!
Feb-25-08  Mendrys: This is a good game to play thru and think about while eating cheese. Some gruyere perhaps or maybe a sharp cheddar.
Feb-04-12  Knight13: With White's bishop on e3 hanging, I would have played 17. Qe1 first, which also prepares the Queen to enter the attack. The bishop on c2 can take care of itself because of the queen on b6, but Ra2 is needed at some point.

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