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| Nov-25-20 | | saturn2: <HeNateMe does 47. B-g7 also work?>
Black has 47...Be7 |
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| Nov-25-20 | | Messiah: Pretty eazy interference, but it is not ugly at all! |
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| Nov-25-20 | | Walter Glattke: Thought for 47.Bg7 Rg5+ 48.Kf2 Be7 49.Rxe7 Rxg7 50.f8Q Rxe7 51.Qxf4+ Kxd5 won for white by theory. 49.f8Q Bxf8 50.Bxf8 Kxd5 won for white. But 47.Bf6 wins clear (I didn't see that) by A) 47.-Be7 48.Bxe7+ Kxd5 49.f8Q B) 47.-Rxf6 48.Ra6+ Ke7 49.Rxf6 Kxf6 50.f8Q+ C) 47.-Bxf6 48.f8Q+ Kxd5 49.Rd7+ |
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| Nov-25-20 | | Brenin: It looks as though Black could have drawn with 46 ... Be7, giving up his B for the 2P, e.g. 47 Bf6 Bf8 48 Ra8 Kxd5 49 Rxf8 Ke6 50 Bc3 Ke7 and 51 ... Kxf7. |
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| Nov-25-20 | | Brenin: <HeMateMe>, <Walter Glattke>: 47 Bg7 only draws after 47 ... Be7, e.g. 47 Bf6 Bf8 48 Ra8 Rxf6 49 Rxf8 Ke7 50 Rc8 K(or R)xf7 51 Rxc5. |
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| Nov-25-20 | | Caissas Clown: <HeMateMe> : You can play the move yourself and then request the engine to analyse it.You aren't restricted to analysing the games moves only. |
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| Nov-25-20 | | Willem Wallekers: Probably my fastest wednesday ever. |
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| Nov-25-20 | | mel gibson: I didn't see this puzzle today either.
That's 3 in a row for me - my worst week ever.
Do I have Alzheimer's or are the puzzles getting harder?Stockfish 12 says:
47. Bf6
(47. Bf6 (♗a1-f6 ♖f5xf6 ♖a7-a6+
♔d6-e7 ♖a6xf6 ♔e7-f8 ♖f6xf4 c5-c4 ♖f4xc4 ♔f8xf7 ♖c4-e4 ♗d8-e7 ♔g1-f2 ♗e7-a3
♔f2-e3 ♔f7-f6 ♔e3-d3 ♔f6-f5 ♖e4-e8 ♔f5-f6 ♖e8-e6+ ♔f6-f7 ♔d3-c4 ♗a3-b2
♖e6-e2 ♗b2-a3 ♖e2-e4 ♔f7-f8 ♔c4-b5 ♗a3-e7 ♔b5-c6 ♗e7-g5 d5-d6 ♗g5-d8 ♔c6-b5
♔f8-f7 ♔b5-c5 ♗d8-f6 ♔c5-c6 ♔f7-g6 ♔c6-b5 ♔g6-f7 ♖e4-f4 ♔f7-g7 ♖f4-f3
♗f6-h4 ♔b5-c6 ♗h4-d8) +24.14/34 605)
score for White +24.14 depth 34 |
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| Nov-25-20 | | Walter Glattke: Tested all possibilities now, Bg7 Be7 is draw, Bf6 wins, all others are favourable for black by Be7. |
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| Nov-25-20 | | Ivan Karamazov: <mel gibson> there's a standard rule: if you got the puzzle, it must be because it was easy; if you didn't, it was because it was very hard.
so we can deduce from your 0/3 that this weeks puzzle were extraordinarily hard. incidentally, i am still User: Dr. J but i just felt like posting under a new handle. |
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| Nov-25-20 | | malt: Found the interference, 47.Bf6 straight away. |
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| Nov-25-20 | | awfulhangover: Found it, but like yesterday, it took a while. Really nice puzzles this week, and hard ones. |
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| Nov-25-20 | | mel gibson: <Nov-25-20 Ivan Karamazov: <mel gibson> there's a standard rule: if you got the puzzle, it must be because it was easy; if you didn't, it was because it was very hard. so we can deduce from your 0/3 that this weeks puzzle were extraordinarily hard. incidentally, i am still User: Dr. J but i just felt like posting under a new handle.> Thanks but it's crazy -
sometimes I get the Saturday or Sunday puzzle instantly then
I fail on a Monday puzzle. LOL |
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| Nov-25-20 | | Oxspawn: <<<Ivan Karamazov: <mel gibson> there's a standard rule: if you got the puzzle, it must be because it was easy; if you didn't, it was because it was very hard.>>
I think the rule is: if you get it, it is easy. If you don't, you are one day older than yesterday and have fewer active brain cells. |
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| Nov-25-20 | | TheaN: <47.Bf6> was an instant spot and I was pretty confident it had to be the solution given that White's lacking winning alternatives. There are a few paths Black can choose, but all lose eventually. 47....Bxf6 48.f8Q+ +- is rather straightforward, as is any other move but RxB, so <47....Rxf6> is Black's only real try, <48.Ra6+>. Prevent immediate promotion with 48....Ke7 49.Rxf6 Kf8 looks like a sturdy defense, but Black has no play left after 50.Rxf4 +-. Black will have to go for some counterplay with <48....Kxd5 49.Rxf6> 2P+B:Q might give White the most work but after 49....Bxf6 50.f8Q Bd4+ 51.Kf1 Be3 52.Ke2 +-, Black isn't going to make progress on the light squares. Q:B is notoriously simple. <49....Be7 50.f8Q Bxf8 51.Rxf8 +->:
click for larger view
2P:R might be Black's only practical saving grace, even though it's not drawing. After 51....Kd4 52.Rxf4+ might look risky but is the simplest as the White king is close enough: 52....Kc3 53.Kf2 c4 (Kd2 54.Rc4 1-0) 54.Ke1 c3 55.Kd1 c2+ 56.Kc1 1-0. After <51....Ke4 52.Rc8 Kd4 53.Kf2> it painfully shows the pawns are too far apart to be an asset. <53....c4 54.Ke2 c3 55.Rf8 Ke4>:
click for larger view
and this final position shows the futility of this try, as now the unexpected, brilliant, splendid, power move comes that wins White the game.... <56.Rf7> and Black's in zugzwang <56....c2 57.Kd2 Kf3 58.Kxc2 Ke3 (Ke2 59.Re8+) 59.Kd1 1-0> is hopeless. |
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| Nov-25-20 | | Cellist: I found the solution, but it took me a long time. I first had to figure out that 47. Ra6+ does not work if Black answers with Kxd5. I considered 47. Kf1 for a while, in order to avoid any discovered checks by Black's bishop (in case I place my R on f6 and Black takes it with the B), but that only draws. Then I saw 47. Bf6. |
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| Nov-25-20 | | Patriot: 47.Bf6! Nice. How many who spotted this instantly would have spotted it as black before playing 46...Rf5? |
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| Nov-25-20 | | Halldor: Nice interference, not hard to spot ― unlike yesterday ― since it has to be about promoting the pawn. |
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| Nov-25-20 | | AlicesKnight: A relative of Nowotny? 47.Bf6. That the P queens with check is vital after ...Bxf6. |
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| Nov-25-20 | | drollere: i had 47. Bg7 Be7, 48. Ra6+ Kxd5, 49. Rf6
Bxf6 (Rxf6, Bxf6) 50. f8=Q, not seeing that black has 49. .. Ke4 and will be two pawns v. B. |
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| Nov-25-20 | | Nullifidian: 47. ♗f6! is an interference. If the bishop takes the bishop, then the pawn promotes. If 47... ♗e7 to cover the queening square, then 48. ♗xe7+ ♔xd5 49. ♙f8=♕ ♖xf8 50. ♗xf8 and white is up a rook and a bishop to two pawns. So the best response seems to be 47... ♖xf6, but after 48. ♖a6+ ♔xd5 49. ♖xf6 ♗e7 (because if ♗xf6 then 50. ♙f8=♕) 50. ♙f8=♕ ♗xf8 51. ♖xf8 white will have a rook to black's two pawns, which, though advanced, can be stopped by the combination of the rook and king. Then it will be an easily won king and rook vs. lone king checkmate. |
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Nov-25-20
 | | eternaloptimist: I’m thinking that 39...♖h5?? is the losing move for Pineda. If he would’ve kept his ♖ on h8 it would’ve been able to guard the queening square f8 & wouldn’t have become a victim to the interference tactic |
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| Nov-25-20 | | saturn2: Theme is interference. But I found 47.Bf6 by observing it drags the rook in a pin after Rxf6 48. Ra6 |
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Nov-26-20
| | eternaloptimist: Actually that tactic is called a skewer or x-ray, not a pin. |
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Jan-24-21
 | | naresb: 47.Bf6 it's an obstruction tactic where White Bishop obstructs the path of opponent's Rook (from restricting the passed pawn promotion). interference is used where one's piece interfers between two opponent kindered pieces. here with 47. Bf6 contact between opposing pieces (Black Rook & White's passed pawn f7) stand obstructed, so Black stand compelled to take Bf6, else White promotes the pawn. 47. Bf6 thus could also be called zugzwang as any move Black chose to play, it worsens his already weakened position (White had passed pawn on 7th rank). |
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sac: 42.Re8+