Mar-13-20
 | | fredthebear: Creative sacrificial play for passed pawn activity. |
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| Feb-25-22 | | Brenin: Black, who is the exchange up, can gain further advantage, in the form of a rampant passed b-pawn, with 20 ... Rxc4 21 bxc4 (21 Qxc4 Qxf2+) b3 22 Qd2 (22 Qe2 Nc3 forks Q and R) Nc3 23 Rf1 (freeing the Q from defending f2) e5 (attacking the N on a6 and defending the B on d4) 24 Nc5 (24 Nb4 Rb8 aids the advance of the b-pawn) b2 25 Qxb2 Na4, winning a piece. |
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| Feb-25-22 | | Honey Blend: I went for the more positional 20. ... ♘c3, attacking the rook. If 21. ♖f1, this frees up my queen to allow 21. ... ♕e7, defending b4 and threatening to trap the ♘a6 with ... ♕b7.
click for larger viewWhite can defend with 22. e5, but 22. ... f6 threatens to open the f-file for the attack. Meanwhile, if 21. ♖d2 to keep some pressure on ♗d4, I play 21. ... ♘b5 threatening ... ♘a3, e.g. 21. ... ♘b5 22. ♘xb4 ♘a3 23. ♕d1 ♘xc4 24. ♖xd4 (not 24. bxc4? ♗c3} ♘xa5 and pretty much walk away with the exchange up unscathed. 
click for larger view |
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| Feb-25-22 | | mel gibson: I didn't get it.
That's why I'm not a grand master.
Stockfish agrees with the game line:
20... Rxc4
(20. .. Rxc4 (♖c8xc4 b3xc4 b4-b3 ♕c2-d2 ♘d5-c3 ♖d1-f1 ♖f8-d8 ♘a6-b4
♗d4-c5 ♕d2-b2 ♗c5xb4 ♕b2xb3 ♕f6-e7 ♕b3-b2 ♕e7-c5 ♖f1-c1 ♗b4xa5 h2-h4 g7-g6
e4-e5 ♗a5-b4 ♖c1xc3 ♗b4xc3 ♕b2xc3 a7-a5 ♕c3-c2 h7-h5 ♗g2-f3 ♖d8-c8 ♔g1-g2
♕c5xc4 ♕c2xc4 ♖c8xc4 ♗f3-d1 ♖c4-d4 ♗d1-c2 ♖d4-d5 ♔g2-f1 ♖d5-c5 ♗c2-a4
♖c5xe5 f2-f4 ♖e5-c5 ♔f1-e2 ♖c5-c3 ♔e2-f2 ♖c3-a3 ♗a4-d1 ♖a3-a2+ ♔f2-e3
♖a2-a1 ♗d1-b3 ♖a1-g1) +7.74/45 442)
score for Black +7.74 depth 45. |
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| Feb-25-22 | | Refused: 20...Rxc4 wants to be played. 21.bxc4 b3 (21.Qxc4 Qxf2+ 22.Kh1 Ne3 is curtains) 22.Qd2 Nc3 23.Rf1 e5!! (attacking a6) 24.Nb4 This should just be -+ White is paralyzed and that black rook is joining the fun. |
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Feb-25-22
 | | al wazir: I saw that the solution had to start with 20...Rxc4 21. bxc4 b3 22. Qd2 Nc3 23. Rf1, but after 23...e5 24. Nb4 Rb8 25. Nd3, there is some play left. The game is far fom over. If, for example, black tries 25...b2 26. Nxb2 Ne2+ 27. Kh1 Rxb2 28. Qd1 Bxf2, then the continuation is 29. Rxf2 Qxf2 30. Qd8#. Now the game *is* over. |
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| Feb-25-22 | | Ivan Karamazov: Black's combination is not as impressive as it seems. According to Stockfish, yes, Black does maintain a winning advantage, but Black's 32...e5 is inaccurate, since, as <al wazir> observes, White can give serious resistance by 33.Nb4 instead of the strange blunder 33.Nc5?? (cue sound effect: "broken record"). SF much prefers 32...Qe7 33.Qb2 Qd6. |
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Feb-25-22
 | | agb2002: Black has a rook for a knight.
White threatens exd5.
The knight on a6 is trapped. This suggests 20... e5 21.exd5 Qxa6 with the threat Qxa5. -----
Another option is 20... Rxc4 21.bxc3 (21.Qxc4 Qxf2+ 22.Kh1 Ne3 wins) 21... b3 trying to exploit the weakness on f2 combined with advance of the b-pawn: A) 22.Qxb3 Qxf2+ 23.Kh1 Ne3 24.Rg1 Nxg2 wins decisive material (25.Rxg2 Qf1+ 26.Rg1 Qxg1#). B) 22.Qe2 Nc3 23.Qd2 Nxd1 24.Qxd1 Qxf2+ 25.Kh1 b2 wins decisive material. C) 22.Qd2 Nc3
C.1) 23.Qxd4 Qxd4 24.Rxd4 b2 and the pawn promotes. C.2) 23.Rf1 Rd8
C.2.a) 24.Qb2 Nxe4
C.2.a.i) 25.Qxb3 Nd2 is winning. For example, 26.Qc2 Nxf1 27.Bxf1 (27.Kxf1 Bxf2 28.Qxf2 Rd1+ 29.Ke2 Re2+ 30.Kxe2 Qxf2+ wins) 27... Bc3 followed by Rd2. C.2.a.ii) 25.Qe2 Nxf2 is winning. For example, 26.Rxf2 Qxf2+ 27.Qxf2 Bxf2+ 28.Kxf2 b2. C.2.b) 24.Kh1 Qe7, with the threat Qd6 and Qa3, must be winning. For example, 25.c5 Qb7 26.Qe2 b2. C.3) 23.Re1 Qxf2+ 24.Qxf2 Bxf2+ 25.Kxf2 b2 with a won ending. -----
A third option is 20... Nc3 directly but White has 21.Rd2. -----
I'd play 20... Rxc4. |
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| Feb-25-22 | | parch: The Black knight is under attack, all I can think of is 20...R:c4 21.bc3 b3 22.Qd2/Qe2 Nc3
(20...Nc3 21.Rd2) |
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Feb-25-22
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Feb-25-22
| | chrisowen: No master dank it v i da i sac rc4 it is no fit a ok be careful no? |
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Feb-25-22
 | | drollere: why 26. Qxd4? the move does not seem forced. |
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| Feb-25-22 | | whiteshark: Missed the deflectional 21...b3! move. :(
Playing through it move by move brought me to <20.e4 Rxc4 21.bxc4 b3 22.Qd2 Nc3 23.Rf1> 
click for larger viewand from here already everything seems to win:
1) -7.84 (37 ply) 23...Rd8 24.Kh1 Qe7 25.e5 Qa3 26.Qg5 Rc8 27.Bb7 Rf8 28.Qd2 Rd8 29.Kg2 b2 30.Qc2 Qa1 31.c5 Bxe5 32.c6 Qxf1+ 33.Kxf1 b1=Q+ 34.Qxb1 Nxb1 35.Kg2 Rd1 36.c7 Bxc7 37.Nxc7 Rd7 38.Nxe6 fxe6 39.a6 Nd2 40.f4 Kf7 41.g4 Rd3 42.h4 Ra3 43.Kf2 Kf6 44.h5 Ra4 45.Bc6 Rc4 46.Ke3 2) -7.00 (37 ply) 23...Qe7 24.Qb2 Qd6 25.Qxb3 Qxa6 26.Qb4 Rc8 27.Re1 Qxc4 28.Qxc4 Rxc4 29.Bf1 Ra4 30.a6 Ra2 31.Kh1 Bxf2 32.Rc1 Bd4 33.Re1 Rd2 34.Bc4 Bf2 35.Ra1 g6 36.e5 Bd4 37.Re1 Kg7 38.g4 Bf2 39.Ra1 Nd5 40.Ra2 Rd1+ 41.Kg2 Bd4 42.Bxd5 exd5 43.e6 fxe6 44.Kf3 Re1 45.Kg3 e5 46.g5 3) -6.92 (36 ply) 23...Qe5 24.Nb4 Rc8 25.Qb2 Rxc4 26.Nd5 exd5 27.Qxb3 Rc8 28.exd5 Ne4 29.Bxe4 Qxe4 30.d6 g6 31.a6 Bb6 32.Qb2 Rc2 33.Qf6 Rd2 34.h4 Qd5 35.Kh2 Qc6 36.Qf4 Rxd6 37.Rc1 Qd5 38.Re1 Kg7 39.Qe5+ Qxe5 40.Rxe5 Bxf2 41.Kg2 Bd4 42.Ra5 h5 43.Ra3 Kf6 44.Kf3 Be5 45.g4 hxg4+ 46.Kxg4 Rd2 47.Re3 Rd4+ 48.Kf3 Rxh4 49.Re4 Rh3+ 50.Kg2 6.0 minute analysis by Stockfish 11 v064 |
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| Feb-25-22 | | daladno: I found the general Rxc4 and b4-b3 line, and was puzzled by the ending too. Maybe White sacrificed his Q out of pure disgust. |
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| Feb-25-22 | | Brenin: <drollere>: By move 26 White is going to lose a piece, probably the N on c5, whatever he does. Perhaps he thought that giving up his Q for B+N was better. It is't, and a better way of losing material might be 26 Nd7 Nxb2 27 Nxf6+ gxf6. However, a further P is now lost since 28 Rc1 allows 28 ... Bxf2+, and if 29 Kxf2 then 29 ... Nd3+ and 30 ... Nxc1. White might as well resign on move 26. |
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Kibitzing
sac: 20...Rxc4