|
< Earlier Kibitzing · PAGE 4 OF 4 ·
Later Kibitzing> |
| Jan-08-09 | | e fred: What about:
18 ... d5
19 Bd3 d6
20 Bc4 Na5
21 Bxe6+ Kh8
22 Qa2 Rd8
23 Bg5
or 19 Bg5
|
|
| Jan-08-09 | | RandomVisitor: After 15...0-0
click for larger viewAnalysis by Rybka 3 : 21-ply
1. (0.62): 16.Qd2 Rfd8 17.Rad1 Kh8 18.Rfe1 Na5 19.Bf1 Nc6 20.Bf2 Kg8 21.a3 Qf7 22.Nb5 Ne8 23.Rc1 a6 2. (0.55): 16.Rc1 Rfd8 17.Re1 Na5 18.Bf1 Nc6 19.Qb3 Qf7 20.Bg5 Rd7 21.Bb5 Rc8 22.Ne2 Rdc7 23.Bf4 Ne8 24.Rcd1 |
|
| Jan-09-09 | | zenpharaohs: neilmcmurdo: "This is a very tough puzzle. I'm surprised it didn't get a higher rating." I think it's because the ratings are based on how long it takes a version of HIARCS to solve the position. In an example like this, HIARCS will compute the critical exchanges very quickly, which leads to an artificially low difficulty rating. |
|
| Jan-09-09 | | MostlyAverageJoe: <zenpharaohs: ratings are based on how long it takes a version of HIARCS to solve the position> NO, that's what <I> do when evaluating the puzzles. CG has a very different approach which they described on chessgames.com chessforum (and perhaps in other posts) and here: Daily Puzzle F.A.Q.. My evaluation places this puzzle on average Friday difficulty level. |
|
| Feb-17-21 | | Cheapo by the Dozen: Ack. I didn't see how easily ... Qf7 would defang d5-d6. |
|
| Feb-17-21 | | Walter Glattke: 18.Qb3 is a blunder threatens Na5, Nc6 allows many parties and opening refutstions (Scotish Danish, Middle Gambit) in connection with -Qh4, one should look at all parries against diagonal pieces with Nc6 and Nf6 during zhe first 5 moves, that coukd be interesting for many viditors of thiscwebsite. Here we have stopping attack againt Pe6 and discovery double double attack against Bc4/Qb3, one can play moves which are offensive and defensive motivated both, after 18.Qb3? we have black advantage so far. 18.-d5 19.Bd3!? d4 20.Nd5 Qc5 typical battle win in advantage situations. |
|
| Feb-17-21 | | saturn2: Imnmediate 18...Na5 fails to 18 Bxe6+
But 18....d5 wins a piece.
18 Bd3 e2, f1 18....d4 or
19.exd5 Na5 |
|
| Feb-17-21 | | Brenin: Black wants to fork Q and B with 18 ... Na5, but fears just losing a pawn to 19 Bxe6+ Kh8 20 Qa2, so first 18 ... d5, blocking the a2-g8 diagonal and winning a piece for a couple of pawns when Na5 is possible. |
|
| Feb-17-21 | | saturn2: The puzzle has subleties I did not consider .
After 19.Nxd5 the answer 19....Nxd5 seems forced and 19...exd5 wrong.In the opening I think the b pawn was poisened because 8...Qxb2 9. Ncb5 Rb8 10. Nc7+ Kd7 11. Nd5 Nxd5 1-
2. exd5 looks good for white. |
|
| Feb-17-21 | | AlicesKnight: Found the ....d5 break and some, but not all, of the follow-ups. Not straightforward. |
|
| Feb-17-21 | | morfishine: Khasin cashed in |
|
Feb-17-21
 | | chrisowen: Nasty revile pd5 faces i aorta goods jugulars etcetera revive nasty month revile revive thanks datas dibsy quarry juicy jogon revile plonk whiff fritz revive vue its hum melts vants cuneiform nears dojos within pebbly revile totadd gacks handy flick creative foboff revive feed its dont change pd5 vibe; |
|
| Feb-17-21 | | njchess: I didn't think this was a particularly difficult puzzle, so I was surprised at the earlier comments (e.g. from 2009). It's clear Black does not want White's bishop to take on e6. That pretty much forces 18. ... d5. The only calculation at that point is when to play ♘a5 in combination with ♕f7. 20. ... ♘a5 is pretty obvious. I would argue that as soon as White plays 21. d6, 21. ... ♕f7 is the only move to avoid the fork. It must have come as a shock to White, to see his seemingly foolproof plan to gain an advantage lie in ruins. What must have been really tough was White had to go through with the exchange or be down even further. By the time the dust settles, he finds himself in a losing endgame. |
|
| Feb-17-21 | | mel gibson: I couldn't see any knockout blow.
Stockfish 12 agrees with the text:
18... d5
(18. .. d5 (d6-d5
♘c3xd5 ♘f6xd5 e4xd5 ♘c6-a5 d5-d6 ♕e7-f7 ♕b3-d3 ♖c8xc4 ♗e3-b6 ♗g7xb2 ♖a1-b1
♗b2-c3 ♗b6xa5 ♗c3xe1 ♖b1xe1 ♖c4-c5 ♗a5-c7 ♖c5-d5 ♕d3-b3 e6-e5 h2-h3 ♖d5-d2
♕b3-e3 ♕f7-a2 ♕e3-g5 ♖f8-f5 ♕g5-d8+ ♔g8-g7 ♕d8-e7+ ♕a2-f7 ♗c7-a5 ♖d2-d5
♕e7-c7 ♕f7xc7 d6xc7 ♖f5-f8 ♗a5-b4 ♖f8-c8 ♗b4-c3 ♔g7-f6 f3-f4 ♔f6-e6 ♗c3xe5
♔e6-d7 ♔g1-f2 ♖c8-e8 ♖e1-e4 ♔d7-c8 g2-g4 ♖d5-c5 ♔f2-e3 b7-b5 ♔e3-f3 b5xa4
♖e4xa4 ♖e8-e6) +1.73/39 88)
score for Black +1.73 depth 39 |
|
| Feb-17-21 | | 1g1yy: <fouard: Shouldn't the goal be a clear win for Black? After the best analysis I have read here, which is 18...d5 19 exd5 Na5 20 d6 Qf7 21 Bxe6 Nxb3 22 Bxf7+ Rxf7 23 Rad1 Nd7, Black is only up a piece for 2 pawns, and unless he can win the passer soon, he may well be losing.> I'm with ya here. I do these at work so I can't spend forever, but I spent a good bit of time looking at the correct starting move, and while I found a bunch of largely even exchanges to open the game up, I found no clear win for B and several disasters pending any wrong move. I'm not sure I would have chosen the line that was taken, even so much as the d5 move. I prefer more of a warm fuzzy feeling that I at least see a clear path to something better than my current situation. My move here as black probably would have been Kh8 or trying to find some more help for the e pawn... :slinksdowninchair: |
|
| Feb-17-21 | | WorstPlayerEver: C'mon engine line with 22. Qd3 Rxc4 is just insane. |
|
Feb-17-21
 | | gawain: Pretty hard. I agree with <Saturn2> about the subtleties. I found this puzzle quite instructive. |
|
| Feb-17-21 | | Ceri Evans: This position is both simple and complex at the time time. Simple, in that if Black cannot play the thematic move 18... d5, then he doesn't have much of a game. Complex, because getting it right afterwards is not easy. 1. c4 c5 2. Nf3 g6 3. d4 cxd4 4. Nxd4 Nc6 5. e4 Nf6 6. Nc3
d6 7. f3 Qb6 8. Be3 Qa5 9. Nb3 Qd8 10. c5 Be6 11. cxd6 exd6
12. Nd4 Bg7 13. Nxe6 fxe6 14. Bc4 Qe7 15. O-O O-O 16. Re1
a6 17. a4 Rac8 18. Qb3 d5 19. Nxd5 Nxd5 20. exd5 Na5 21. d6
Qf7 22. d7 (22. Bxe6 Nxb3 23. Bxf7+ Rxf7 24. Rad1 Rd7
25. Bb6 Kf7 26. Re3 Rc1 27. Rxc1 Nxc1 28. Bc5 b6 29. Bxb6
Rxd6) 22... Rxc4 23. Qb6 Nc6 24. Qxb7 Nd4 0-1
click for larger viewBlack just has to find the right moves at each threat. Cheers,
Ceri |
|
| Feb-17-21 | | WorstPlayerEver: 18... d5 19. Nxd5 Nxd5 20. exd5 Na5 21. d6 Qf7 22. Qd3 Rxc4 23. Bb6 Bxb2 24. Rab1 Bc3 25. Bxa5 Bxe1 26. Rxe1 Rc5 27. Bc7 Rd5 28. Qe4 b5 29. axb5 axb5 30. Qxe6 Qxe6 31. Rxe6 b4 32. d7 Rxd7 33. Bd6 Ra8 34. Bxb4 Rb7 35. Bc3 Rb3 36. Rc6 Rb1+ 37. Kf2 Ra2+ 38. Ke3 Rxg2 39. Rc8+ Kf7 40. Rc7+ Ke6 41. Rxh7 Rb3 42. Kd4 Rc2 43. Rc7 Rxh2 44. Rc6+ Kf5 45. Kc4 Ra3 46. Rc5+ Ke6 47. Kd3 Rh3 48. Ke4 Rh4+ 49. f4 g5 50. Re5+ Kd7 51. Rd5+ Kc6 52. Be5 Ra4+ 53. Rd4 Rxd4+ 54. Kxd4 draw
click for larger view |
|
| Feb-17-21 | | agb2002: Level 3: 15...?
A Shvedchikov vs Yermolinsky, 1981
click for larger view |
|
| Feb-17-21 | | Ceri Evans: <WorstPlayerEver: 18... d5 19. Nxd5 Nxd5 20. exd5 Na5 21. d6 Qf7 22. Qd3 Rxc4 23. Bb6 Bxb2 24. Rab1 Bc3 25. Bxa5 Bxe1 26. Rxe1 Rc5 27. Bc7 Rd5 28. Qe4 b5 29. axb5 axb5 30. Qxe6 Qxe6 31. Rxe6 b4 32. d7 Rxd7 33. Bd6 Ra8 34. Bxb4 Rb7 35. Bc3 Rb3 36. Rc6 Rb1+ 37. Kf2 Ra2+ 38. Ke3 Rxg2 39. Rc8+ Kf7 40. Rc7+ Ke6 41. Rxh7 Rb3 42. Kd4 Rc2 43. Rc7 Rxh2 44. Rc6+ Kf5 45. Kc4 Ra3 46. Rc5+ Ke6 47. Kd3 Rh3 48. Ke4 Rh4+ 49. f4 g5 50. Re5+ Kd7 51. Rd5+ Kc6 52. Be5 Ra4+ 53. Rd4 Rxd4+ 54. Kxd4 draw> 23... Nxb3 ∓ |
|
| Feb-17-21 | | Ceri Evans: Sorry, that's the trouble with analysing blind. The Q is on d3 in your line... |
|
| Feb-17-21 | | Ceri Evans: <WorstPlayerEver: > You may be right. If Black is going to improve, move 31... seems like a good place to look. |
|
| Feb-17-21 | | WorstPlayerEver: This is a forced line:
22. Qd3 Rxc4 23. Bb6 Bxb2 24. Rab1 Bc3 25. Bxa5 Bxe1 26. Rxe1 
click for larger viewIn this position White is going to play Bc7 and then it's theory. Black can't play 26... Rac8, for instance, because of 27. d7, or 26... Qf4 27. d7 Rd4 28. Qe2 Rxd7 29. Qxe6+ So 26... Rc5 27. Bc7 Rd5 28. Qe4
click for larger viewIn this position the Bishop is exactly equal to a Rook. It's not even a question. Both opponents have 5 pawns each. Same material, except two pieces on the board: the B vs R. Since the position is a forced draw, technically the B is worth a R in this case (and there are many comparable cases, obviously). It's math, oh well, still a lot of work to do for the engine jockeys. |
|
| Feb-17-21 | | Whitehat1963: Wednesday? Felt more like Friday, but I wouldn’t know what solving a Friday puzzle feels like! |
|
 |
|
|
< Earlier Kibitzing · PAGE 4 OF 4 ·
Later Kibitzing> |
Kibitzing
