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Later Kibitzing> |
| Feb-07-19 | | Cheapo by the Dozen: The key to this one, after the initial sacrifice idea, is seeing how devastating the checks on c4 are. Pretty easy for a Thursday. |
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| Feb-07-19 | | Mayankk: Got it. And so nice to see the entire mating combination being played out in the game. In most GM games, we pitifully stop 100 moves before a forceful mate, since the GMs can calculate it all while we mere mortals struggle to figure out how exactly. So it’s refreshing to see it actually play out. |
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| Feb-07-19 | | patzer2: Knowing it's a moderately difficult Thursday puzzle, I solved this one (36...?) easy enough. Now if only someone would whisper in my ear that I have a winning King hunt when I'm playing OTB, I'd easily be able to pull off combinations like this in my own games. |
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| Feb-07-19 | | bubuli55: 42...Qa6# like |
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Feb-07-19
 | | scormus: drat, didn't quite get this one. Missed 40 Nc7 ;) |
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| Feb-07-19 | | patzer2: So where did White go wrong? The losing move appears to be 19. Nc4?, leaving the White e-pawn unprotected and giving Black a practically won game after 19. Nc4? Bxb2+ 20. Kxb2 Nxe4 -+ (-2.04 @ 33 ply, Stockfish 10). Instead, protecting the e-pawn with 19. Rhe1 = (0.00 @ 31 ply, Stockfish 10) holds the position level. Earlier, White missed a chance to secure a strong advantage with 9. Ng5 Qe7 10. Nxe6 Qxe6 11. Bc4 ± (+1.48 @ 29 ply, Stockfish 10). Instead, 9. e4?! f4 gave Black sufficient counter play to find a way equalize and steal the initiative after 10. Ng5?! (better is 10. Nc4 ⩲) 10...Bg8 = to ⩱. |
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| Feb-07-19 | | OrangeTulip: K McDonald had a farm hihahihaho, and on that farm he had a horse.... |
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| Feb-07-19 | | mel gibson: It's an easy puzzle.
It's mate in 6. |
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| Feb-07-19 | | Sokrates: <mel gibson: It's an easy puzzle.
It's mate in 6.>
Yeah, like an old club player used to say, "It's a plain and simple 12 moves combination". |
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| Feb-07-19 | | malt: 36...R:a4+ 37.ba4 Q:a4+ 38.Kb2 Qa2+
39.K:c3 Rc8+ 40.Kb4
(40.Kd4 Qc4# )
40...Rc4+ 41.Kb5 Qa4# |
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| Feb-07-19 | | TheaN: Thursday 7 February 2019
<36....?>
Mate time.
<36....Rxa4+ 37.bxa4 (37.Kb2 Ra2# / 37.Qa3 Qxa3#) Qxa4+ 38.Kb2 (Qa3 Qxa3#) Qa2+!> the actual key <39.Kxc3 Rc8+ 40.Nc7> similar without interposing <40....Rxc7+ 41.Kb4 (Kd4 Qc4#) Rc4+ 42.Kb5 Qa4/6#>. Plain, but not necessarily simple. |
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| Feb-07-19 | | saturn2: I saw 36...Rxa4+
37. bxa4 (Qa3 or Kb2 is rubbish) Qxa4+ 38. Kb2 Qa2+ 39. Kxc3 Rc8+ 40. Nc7 Rxc7+
with various mates. |
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| Feb-07-19 | | mel gibson: <Yeah, like an old club player used to say, "It's a plain and simple 12 moves combination".> No - 12 moves is hard - 6 moves in this case was easy.
The King had hardly anywhere to go.
This was a Monday puzzle. |
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| Feb-07-19 | | TheaN: <mel gibson: <Yeah, like an old club player used to say, "It's a plain and simple 12 moves combination".> No - 12 moves is hard - 6 moves in this case was easy. The King had hardly anywhere to go.
This was a Monday puzzle.>
That is entirely personal, tbh. A beginner finds a mate in one hard, a novice a mate in three. The World Champion can struggle with converting the minimalist of advantage in the endgame (but actually does). Today's mate is not easy or hard by moves per se, it lies in finding 38....Qa2+!, that's the key. |
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| Feb-07-19 | | Mayankk: A follow up question - which of the Black pawns on d6, e4 and f4 are 1) absolutely critical for mate
2) not critical for mate but should still lead to a Black win if absent 3) will lead to disaster for Black if absent |
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| Feb-07-19 | | whiteshark: (Pretty much) a forced mate |
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| Feb-07-19 | | TheaN: <Mayankk: A follow up question - which of the Black pawns on d6, e4 and f4 are 1) absolutely critical for mate
2) not critical for mate but should still lead to a Black win if absent
3) will lead to disaster for Black if absent> Your wording on the questions seems a bit odd: any pawn that's not 'critical for mate' will lead to a Black win because of mate :>. Also, 1 and 3 spell out the same concept. I do think the concept is good so I'll divide the questions in 1) not critical for the variation, 2) not critical for mate and 3) critical for the win. All variations include the Kd4 escape, with or without Nc7 in between. 1) e4 can be removed and nothing changes: in case of Kd3, Qc4# is still mate. 2) d6 definitely disrupts the pattern; although I do think it's still disaster after 40.Kd4 Qc4+ 41.Ke5 e3! with the threat of Re8+. Not entirely sure. 3) f4 is curtains for Black. With the White King on e3 Black can't do anything; White should make sure to keep the Knight on the board for extra defense. |
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| Feb-07-19 | | TheaN: Decided to test all three (-e4, -d6 and -f4) from the combination start in SF9, and I misjudged the -d6 position. -e4 is indeed still -#7 by the same combination. -d6 is obviously won for Black by 36....Rxd5 :>, but the combination is a draw after 40.Kd4 Qc4+ 41.Ke5 Re8+ (e3? 42.Nf6! +-) 42.Kf6 Qc6+ and Black has nothing more than perpetual. -f4 is nothing more than a draw from the combination position (by virtue of Nxd5 instead of Qa2+). If Black plays the combination, he loses after 40.Kd4 Qc4+ 41.Ke3 +- |
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| Feb-07-19 | | landshark: <Now if only someone would whisper in my ear that I have a winning King hunt>
A bigger problem for me is spending too much clock time looking for stuff like this (I play a lot of 15/15) in situations where such king hunts <almost> work /: |
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| Feb-07-19 | | stacase: <patzer2: ... if only someone would whisper in my ear that I have a winning King hunt when I'm playing OTB, I'd easily be able to pull off combinations like this in my own games.> I doubt if I'd see this one over the board. I know that 39.Kxc3 was a surprise - Duh! Dunno, maybe I would have tried it. But it would have been a hunch. |
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| Feb-07-19 | | JohnBoy: Sorry <mel>. This retired 2200 player got thru ...Qa2+ Right away, but had to rethink several times to trust that the white K doesn’t escape. |
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| Feb-07-19 | | Cibator: Unusual for Black to get a winning Q-side attack from a Dutch Defence. (Being UK-born and raised I'm going to insist on that spelling.) |
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Dec-02-22
 | | fredthebear: It's a short Railroad Mate, not a triangle mate, fool. |
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| Dec-02-22 | | Shangri La: Cool railroad mate! |
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| Dec-02-22 | | stone free or die: Well, <RRM's> (railroad mates) end in one or two final positions, and so, on <CT> (chesstempo), they get tagged twice, i.e. as RRM and with the final position tag. So I could go with Triangle mate (or RRM-ortho!) too. Not sure what all the hubbub is about here. |
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Kibitzing
sac: 36...Rxa4+