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< Earlier Kibitzing · PAGE 2 OF 2 ·
Later Kibitzing> |
Feb-17-16
 | | WannaBe: Shoot, ...Kf8 wasn't the solution. Swear I had that (winning) line. |
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| Feb-17-16 | | The17thPawn: Had nxb3 50. Qxb3,rxd4 51. Rxd4,Rxd4 52. Rxd4'Bxe5+. With BxR next move but this only garners 2 pawns. Besides white may just block with Bd3 after the first rook exchange. The game continuation is clearer. |
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| Feb-17-16 | | patzer2: I went for the simple <49 ...Rxd4 50.Rxd4 Bxe5+?> which misses on the second move solution to this Wednesday puzzle, as it fizzles out to equality after 50... Bxe5+? 51. Kg2 Bxd4 52. Rxd4 Rxd4 53. Qxd4 Nxb3 54. Qxb4 Nc5 = (0.00 @ 22 depth, Deep Fritz 15). Instead, as <Phony Benoni> observes, 50...Qxe5+!  wins by adding <an extra attacker> to reload for a winning double attack after 50... Qxe5+! 51. Qxe5 (51. Kf2 Qxd4 52. Rxd4 Bxd4 53. Bc2 Bxe3+ 54. Kxe3 e5 ) 51... Bxe5+ 52. Kg4 f5+ 53. gxf6 Rxd4+ 54. Rxd4 Bxd4 (-4.98 @ 21 depth, Deep Fritz 15). Where did White go wrong? White's decisive error was 49. fxg5?, allowing 49...Rxd4 . Instead, 49. Kh3! gxf4 50. Qg1  (+1.06 @ 22 depth, Stockfish 6) gives White winning chances. |
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| Feb-17-16 | | agb2002: Black has a bishop and a knight for the bishop pair and a pawn. The bishop on d4 protects e5. This suggests 49... Rxd4 50.Rxd4 Qxe5+: A) 51.Qxe5 Bxe5+ ends up a piece ahead at least. For example, 52.f4 Rxd4 53.Rxd4 (53.Rc1 Bxf4+ 54.Kf3 Bd6 - + [N+P]) 53... Bxd4 - + [N]. Or 52.Kg4 Rxd4+ 53.Rxd4 Bxd4 - + [N]. B) 51.Kf2 Rxd4 wins a piece and a pawn.
C) 51.Qf4 Rxd4 52.Rxd4 Qxd4 53.Qb8+ Bf8 - + [N].
D) 51.f4 Qxe3+ wins.
E) 51.Rf4 Rxd1 52.Qf2 (52.Qxe5 Bxe5 ends up a whole rook down for White) 52... Rd4 wins. |
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| Feb-17-16 | | gofer: The only comment to make about the POTD is that white cannot accept the exchange down... <49 ... Rxd4>
50 Rxd4 Qxe5+ 
This wins a piece in all scenarios, an example is as follows; 51 Kf2 Rxd4
52 Rxd4 Qxd4
53 Qxd4 Bxd4+
54 Ke2 Nxb3
<50 f4! ...>
This loses a piece, but saves the position. Black's piece advantage, its DSB, is muted behind three pawns. 
click for larger viewI would guess that perhaps our silicon friends prefer this option to losing a piece and a pawn. |
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| Feb-17-16 | | stst: Black can regain a major piece and balance by
49.............Rxd4
50.Rxd4 (Qxd4 is losing too much, letting it go also undesirable) Bxe5+ forking the R
51.Kg2 (onto a White sq to avoid any further harass of the B, if ever stays there) Then it's White's call whether to retake with the R, if so, Black R also takes, then Black got Q+N and White has Q+B.
Yet White's b-Pawn is weak.
More analyses tomorrow.. |
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| Feb-17-16 | | chessamateur: I spent a long time looking for the win only to realize that it was a black to move and win and then I felt stupid. |
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| Feb-17-16 | | Lambda: You don't really need to see 50...Qxe5+ here in order to get the puzzle, checking 50...Bxe5 and dismissing 49...Nxb3 are sufficient to establish the best move, then you can look at alternative ideas next move. |
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| Feb-17-16 | | mel gibson: I didn't find that easy.
There are way too many combinations
for only a small advantage for black. |
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| Feb-17-16 | | cocker: White should not have taken the g-pawn on move 49; 49 Kh3 would have kept him in the game. |
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| Feb-17-16 | | Coriolis: Is 49… Rxd4 50. Rxd4 Rxd4 51. Rxd4 Qxe5+ also a sound line? |
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| Feb-17-16 | | WorstPlayerEver: "50 f4! This loses a piece, but saves the position. Black's piece advantage, its DSB, is muted behind three pawns." Funny you say so; 50... Rd2 51. Rd2 Rd2 52. Qd2 and now ... Be5 indeed mutes White's pawns for good. |
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| Feb-17-16 | | CHESSTTCAMPS: White has a material advantage of a bishop pair plus an extra pawn for bishop+knight, but the battle for d-file control is central and favors black. Although black has only two attackers on d4 while white has three defenders, black can add two attackers with tempo: 49... Rxd4! 50.Rxd4 Qxe5+ and now:
A.51.Qxe5 Bxe5+ 52.f4 Bxd4 53.Bc2 (otherwise Nxb3) Kg7 and black's extra knight should prevail, regardless of opposite-colored bishops. B.51.Kf2 Rxd4 52.Rxd4 Qxd4 53.Bc2 (53.Qxd4 Bxd4+ followed by Nxb3) Qb2 also leaves black a piece up in full control. Time for review... |
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| Feb-17-16 | | patzer2: <gofer> Good catch on the strong defense 50. f4! Playing it out move-by-move with Deep Fritz 15 resulted in a drawn King and Pawn ending after 50. f4! Rxd2 51. Rxd2 Rxd2 52. Qxd2 Bxe5 53. fxe5 Qxe5+ 54. Kg4 Nxb3 55. Qxb4 Qe2+ 56. Kg3 Nd2 57. g6 Qf3+ 58. Kh4 Qf6+ 59. Kg4 Nxb1 60. gxf7+ Kxf7 61. Qb7+ Kg6 62. Qxb1+ Qf5+ 63. Qxf5+ exf5+ 64. Kf4 Kf6 65. Kf3 Kg5 66. Kg3 =. There may be improvements for Black here, but this line is sufficient to convince me that after 50. f5! any win by Black would be extremely difficult and might require a mistake on White's part. |
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| Feb-17-16 | | patzer2: After a second look, maybe there is a win against 50. f4! Instead of 50. f4! Rxd2 51. Rxd2 Rxd2 52. Qxd2 Bxe5, Black should probably hold off on exchanges with 52...Qb7 (diagram below) 
click for larger viewwhen Deep Fritz 15 indicates play might continue 53. Qe3 Bf8 54. Bc2 Qh1 55. Qe2 Qg1+ 56. Kf3 Qd4
57. Kg3 Qc3+ 58. Kg4 Bg7 59. Qd1 Qe3 60. Qf3 Qe1 61. Qa8+ Bf8 62. Qg2 Qe3 63. g6 Nd3 64. gxf7+ Kxf7 65. Qb7+ Be7 66. Bxd3 Qxd3 (-5.59 @ 21 depth). P.S.: After 50. f4! this problem approaches Sunday level in difficulty. Finding the game saving move 49. Kh3! also makes for a difficult puzzle. |
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| Feb-17-16 | | WorstPlayerEver: 50. f4 Rd2 51. Rd2 Rd2 52. Qd2 Be5 53. fe5 Qe5 54. Kg4 Nb3 55. Qb4 Qe2 56. Kg3 Nd2 57. g6 f5 wins. |
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Feb-17-16
 | | LoveThatJoker: 49...Rxd4 50. Rxd4 Qxe5+! 51. Qxe5 (51. Kf2 Rxd4 ) 51...Bxe5+ 52. f4 Rxd4! LTJ |
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| Feb-17-16 | | patzer2: <WPE> In the line <50. f4 Rd2 51. Rd2 Rd2 52. Qd2 Be5 53. fe5 Qe5 54. Kg4 Nb3 55. Qb4 Qe2 56. Kg3 Nd2 57. g6>, your improvement 57...f5 (-3.49 @ 27 depth, Deep Fritz 15) appears to give Black very good winning prospects. |
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| Feb-17-16 | | WorstPlayerEver: @patzer2
Yes, but still 50. f4 is a good catch :) |
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| Feb-17-16 | | kevin86: Black picks up a piece after the upcoming fork. |
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| Feb-17-16 | | RandomVisitor: as <cocker> has mentioned, 49.Kh3! changes the dynamic so that after 49...gxf4 50.Qg1 Rxd4 51.Rxd4 Rxd4 52.Qxd4 Bxe5 53.Qxb4 f5 54.Bc2 Qg7 white likely has the upper hand |
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| Feb-17-16 | | RandomVisitor: After 39...axb3??
click for larger viewWhite has either 40.Rh2 or 40.Rh1!
play might continue:
40.Rh2 Bf8 41.Rdh1 Bg7 42.Bxc5
winning a piece. The black bishop must remove itself from the defense of the black knight to prevent mate, allowing white a simple piece capture, winning. |
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| Feb-17-16 | | RandomVisitor: After 27.gxf3
click for larger viewwho would have guessed black's best move:
Komodo-9.3-64bit:
<-0.14/41 27...Nd3> 28.Rxd3 Qxc2 29.R3d2 Qf5 30.Qxf5 gxf5 31.Be3 Rxd2 32.Rxd2 Rxd2 33.Bxd2 a4 34.Kf1 b5 35.Ke2 Bc5 36.f4 Kf8 37.Kf3 Be7 38.Ke2 Ke8 39.Kd3 Kd7 40.b3 axb3 41.axb3 Kc6 42.Be3 Kd5 43.Bb6 Bb4 44.Be3 Kc6 45.Kd4 Bf8 46.Kd3 Be7 47.Bd4 Bb4 48.Be3 Kd5 49.Bb6 note that 28.Bxd3 Rxd4 29.Qh2 Bb4 does not work for white |
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| Feb-17-16 | | RandomVisitor: 25.Nh2 is almost winning:
click for larger viewKomodo-9.3-64bit:
<+2.00/34 25...gxh5 26.Nf1> Bg7 27.Ng3 Kf8 28.Nxh5 Rxd4 29.Rxd4 Rxd4 30.Qxd4 Bxe5 31.Qh4 Bd5 32.Bxh7 Ke8 33.Nf6+ Bxf6 34.Qxf6 Nd7 35.Qh8+ Ke7 36.Bb1 Qc4 37.Qd4 Qxd4 38.Rxd4 Ne5 39.Kh2 Kd6 40.Rd1 Kc5 41.Rc1+ Kd6 42.Kg3 a4 43.Bc2 Bxa2 44.Bxa4 Bd5 45.Bb5 Nc6 46.Bxc6 Bxc6 47.f3 Bd5 48.Kg4 f6 49.Rc8 e5 |
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Feb-17-16
 | | Bubo bubo: At the moment the Bd4 is defended thrice against two attackers, but after 49...Rxd4 50.Rxd4 (otherwise White has just lost a piece) Qxe5+ <two> new units join the attack, and now its 3:2 in Black's favour. White cannot save the Rd4: 51.Qxe5 Bxe5+ 52.Rf4 fails to Rxd1 and 51.f4 to Qxe3+, so we have a net gain of bishop and pawn for Black. An charming bunch of tactics: Removal of the guard, fork, and pin! |
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Kibitzing
sac: 49...Rxd4