| Aug-08-19 | | kungfufighter888: Black play Rook b1 check win ? |
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| Aug-08-19 | | Cheapo by the Dozen: White has a winning material advantage, but if he can't force simplification, Black has outastanding chances for a perpetual check. 38 Rxg7+ sacrifices a rook (for a pawn), in the confident expectation that White will shortly be able to win Black's queen for the other rook, or else mate. In the actual game Black chose a line that led to getting mated. |
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| Aug-08-19 | | Cheapo by the Dozen: <kungfufighter888>: Did you overlook the fact that Black is in check? |
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| Aug-08-19 | | goldfarbdj: kungfufighter888 might have been talking about the initial puzzle position, where Black can't play Rb1+ because it isn't Black's turn. Of course, in both cases Qd1 seems to me a much stronger move if it were legal. (38 ... Qd1+ 39 Qe1 Qxf3+ and mate next.) As for me: given Black's massive threats against White's exposed king, it was obvious that something very forcing was required. Rxg7+ was the obvious choice, and it was just a matter of verifying that 38 ... Kxg7 39. Qg5+ was winning. I worked out the game line, and also 40...Ke6 41. Rh6+ Kd7 42. Rxd6+ Kxd6 43. Qf6+, picking up the rook on b2. |
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| Aug-08-19 | | newzild: Black's best defence is probably:
38. Rxg7+ Kxg7
39. Qg5+ Qg6
40. Qe7+ Kg8 (not 40...Qf7 Rh7+, when White will also pick up the Rb2) And now after 41. Rg5 Rb1+, it will be rook vs queen. |
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| Aug-08-19 | | Cheapo by the Dozen: Or perhaps the question was why Black didn't play 37 ... Rxb1+, which was less bad than the game move in that it delayed White getting the initiative. |
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| Aug-08-19 | | Manu2: I really wonder why Black was so greed instead of simply going for 37....Rb1+. It has very good chances if not winning actually |
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| Aug-08-19 | | patzer2: Today's Thursday puzzle solution 38. Rxg7+ +- features an instructive King hunt using the heavy artillery (i.e. Rooks and Queen versus Rooks and Queens). So where did Black go wrong? The decisive error was 34...e4? allowing 35. Rdh5 +- (+4.57 @ 29 ply, Stockfish 10) or 35. d7 +- (+10.09 @ 30 ply, Stockfish 10). Instead, Black could have held the game level with 34...Rxe2 35. Kxe2 Qg2+ 36. Qf2 Qxh1 = (0.00 @ 35 ply, Stockfish 10). |
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| Aug-08-19 | | Lambda: 38...Kf8 must also be considered. White's goal is generally to chase the black king to somewhere Qg5 can be played with check. |
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| Aug-08-19 | | latebishop: 37...Rb1+ looks saving but after 38.Ke2 Qxg1 (38...Rxg1 39.Qb3+ Kf8 40. Rh8 mate) 39.Qxg1 Rxg1 40.d7 exf3+ 41.Kd2 f2 42.d8=Q+ Kf7 43.Qd7+ White mates. 38...Q×f3+ also doesn't seem to work. |
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| Aug-08-19 | | saturn2: I saw 38. Rxg7+ Kxg7 39. Qg5+
Kf7 (or..Qg6 40. Qe7+ Qf7 41. Rg5+) Rh7+ Ke8 41. Qg8+ Qf8 42. Qe6+ |
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| Aug-08-19 | | agb2002: White has a rook for two pawns.
Black threatens Qd1+ and mate in two.
The first idea that comes to mind is 38.Rxg7+:
A) 38... Kxg7 39.Qg1+
A.1) 39... Qg6 40.Qd4+ (40.Rg5 Rb1+ wins for Black) A.1.a) 40... Qf6 41.Rh7+ Kg6 42.Rh6+ wins.
A.1.b) 40... Kf7 41.Qd5+
A.1.b.i) 41... Kf6 42.Qe5+ Kf7 43.Rf5+ Kg8 44.Rg5 wins decisive material. A.1.b.ii) 41... Kg7 42.Rg5 as above.
A.1.b.iii) 41... Ke8 42.Rh8+ Ke7 43.Qe5+ followed by 44.Qxb2 wins decisive material. A.1.b.iv) 41... Ke7 42.Re5+ Kf8 (42.... Kf6 43.Re6+ wins decisive material) 43.Qd8+ Kf7 (43... Kg7 44.Rg5) 44.Qe7+ Kg8 45.Rg5 wins decisive material. A.1.b.v) 41... Qe6 42.Rh7+ wins.
A.1.c) 40... Kg(f)8 41.Rh8+ followed by 42.Qxb2 wins decisive material. A.2) 39... Kf8 40.Rh8+ Ke7 (40... Kf7 41.Qg8+ Ke7 -41... Kf6 42.Rh6+ wins- 42.Qg7+ as in the line) 41.Qg7+ Ke6 42.Rh6+ wins. A.3) 39... Kf7 40.Rh7+
A.3.a) 40... Kf(e)6 41.Rh6+ wins decisive material (41... Ke5(7) 42.Qg5+, etc.). A.3.b) 40... Ke8 41.Qg8+ Qf8 42.Qe6+ and mate next. A.3.c) 40... Kf8 41.Qg7+ Ke8 42.Rh8+ Qf8 43.Rxf8#. A.4) 39... Kf6 40.Rh6+ wins.
B) 38... Kf8 39.Rf5+
B.1) 39... Ke8 40.Qxe4+ with a winning attack.
B.2) 39... Kxg7 40.Qg5+
B.2.a) 40... Qg6 41.Qe7+ Kh6 (41... Kg8 42.Rf8#; 41... Kh8 42.Rg8+ and mate in two) 42.Rf6 wins decisive material. B.2.b) 40... Kh7 41.Rf7+ Kh8 42.Qg7#.
B.2.c) 40... Kh8 41.Qh5+ Kg8 (41... Kg7 42.Rf7+ Kg8 43.Qh7#) 42.Qf7+ Kh8 43.Rh5+ Qh6 44.Rxh6#. |
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| Aug-08-19 | | TheaN: Interesting that in most cases Q+R will dominate a sole Q in a king hunt; the problem is that even though she's the strongest piece, the queen is also the most valuable and a lot of defensive setups allow the Q+R side to win Q:R. Here, White has to defuse Qd1+ and Rb1+ by giving back the material <38.Rxg7+>. In itself not really a !, as White can't really do much else. <38....Kxg7 39.Qg5+> whereas after 38....Kf8 Black prevents an immediate Qg5+ but with an additional rook White can find a few ways to win: the best probably is 39.Rg8+ Kf7 (Kxg8 40.Qg5+ similar to the game line; Ke7 40.Rh7+ and mate soon) 40.Rf5+!, this move is key to force Black to take the g-rook, 40....Kxg8 (Ke7 41.Qg5+; Ke6 41.Rg6+; both mate soon) 41.Qg5+ Kh8 42.Re8+ Kh7 43.Re7+ Kh8 44.Qg7#. <39....Qg6> Kf8 (Kf7 is similar) perhaps challenges White to finish it but it's objectively worse than Qg6 as after 40.Rh8+ Kf7 41.Rh7+ Ke6 (Kf8 (Ke8 similar) 42.Qg7+ Ke8 43.Qg8+ Qf8 44.Qe6+ Kd8 45.Qd7#) 42.Rh6+ Kd7 43.Rxd6+ Kxd6 44.Qf6+ +- and White picks up everything. However <40.Qe7+ Kg8 (Qe7 41.Rh7+ Kxh7 42.Qxf7+ with 43.Qf6+ +-) 41.Rg5 +-> is relatively easy to spot and Black has no time to take White's pawns off, with an easy win for queen. |
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| Aug-08-19 | | malt: Black could have played 37...Rb1+
38.Ke2 ef3+ |
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Aug-08-19
 | | Sally Simpson: ***
I like these heavy piece endings. Rooks stomping around like brutal Ogres, nimble wicked Queens tiptoeing on the diagonals looking for a way to hurl an Ogre to smash though a cowering King's defensive shield. Two Ogres wers dashed against the rocks in this game. (note 'Rocks' not 'Rooks'.) Black had a good chance here to hold the game.
click for larger view34....Rxe2 looks OK. 35. Kxe2 Qg2+ and Qxh1 it's still game on. (that that d6 pawn is countered by White's exposed King.) 35.Qxe2 Rxf3+ wins for Black. Black missed it (move 34 is time trouble territory - maybe playing for a win.) and threw the other Ogre instead. White, not to be outdone in the Ogre saccing stakes, hit back with their own Ogre sac and it was 1-0. The moral of the story is:
Take advice from one who is older,
that before sacrificing an Ogre,
always look for one that is bolder,
That way you won't cry on a shoulder.
*** |
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| Aug-08-19 | | Ratt Boy: Look; if I got this within a minute, that means it was WAY EASY for a Thursday. |
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Aug-08-19
 | | Dionysius1: I like the theme of forcing the K away from defending the Q. Are/were the top GM's up to creating a theme just for the aesthetic value, once they knew they were winning? |
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Aug-08-19
 | | Breunor: On 27 Rb1:
1) +5.17 (25 ply) 38.Ke2 exf3+ 39.Kd2 Qxd6+ 40.Kc2 Rxg1 41.Qb3+ Kf8 42.Rf5+ Ke8 43.Qf7+ Kd8 44.Rd5 Rg2+ 45.Kb3 Rg6 46.Qxb7 f2 47.Rxd6+ Rxd6 48.Qb8+ Ke7 49.Qa7+ Kf8 50.Qxf2+ Kg8 51.Kb4 Rf6 52.Qd4 Kf7 53.Qd7+ Kg6 54.Ka4 Kh7 55.Qd3+ Kh6 56.Qc3 Kg6 57.Qg3+ Kh6 Losing move is 34 e4 which missed Rxe2:
1) =0.00 (28 ply) 34...Rxe2 35.Kxe2 Qg2+ 36.Qf2 Qxh1 37.d7 Rd8 38.Qb6 Qg2+ 39.Ke1 Qg3+ 40.Ke2 Qg2+ After 34 e4, we have:
1) +8.30 (24 ply) 35.d7 Rh2 36.Rxh2 Qxh2 37.d8=Q Rxd8 38.Rxd8+ Kf7 39.Rd7+ Kg8 40.Qd4 Qh1+ 41.Kf2 Qh4+ 42.Ke3 Qg5+ 43.Kxe4 Kh7 44.Kd3 a5 45.Rd8 Qg6+ 46.Kd2 Qf6 47.Qd3+ g6 48.Qd7+ Qg7 49.Qe6 b5 50.Kd3 2) +5.11 (23 ply) 35.Rdh5 Rxf3+ 36.exf3 Rb2 37.Rg1 Rb1+ 38.Ke2 exf3+ 39.Kd3 Qxd6+ 40.Kc2 Rxg1 41.Qe8+ Qf8 42.Rh8+ Kxh8 43.Qxf8+ Kh7 44.Qxf3 Kh6 45.Qxb7 Rg6 46.Qh1+ Kg5 47.Qg1+ Kh5 48.Qc5+ Kh6 49.Qe3+ Kh5 50.Qe4 Kg5 51.Qe7+ Kh5 52.Qc7 Kh6 53.Qf4+ Kh5 54.Qf5+ Kh6 55.Qh3+ Kg5 56.Qg2+ Kh6 57.Qh2+ Kg5 58.Qg3+ Kh5 59.Qe5+ Kh6 |
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| Aug-09-19 | | TheaN: Interesting about yesterday's puzzle (as there isn't much to discuss about today's re-re-cycle) how strong 35.d7! is. I'd say White erred playing 35.Rdh5?! even though it wins. The key is <35.d7 Rd8> the only move that defuses White's threat is Rh2 which is why engines give that, but after Rxh2 and d8=Q Black loses all counter play. Rxe2 doesn't work because of the same combination where it's #7 as Black's blocking f8. The key after Rd8 (or Rxe2) is a very unique <clearance>. In fact, White has time and the means to set up a <clearance setup sacrifice>: after <36.Rh8+! Kxh8 (Kf7 37.Rxd8 +-) 37.Rh5+ Kg8> White just cleared a2-g8 by saccing Rh1 first, so <38.Qb3+ Kf8 39.Rf5+ Ke7 40.Rf7+ Kd6 41.Qb6+ +-> creates an inescapable mating net. White possibly didn't foresee allowing the diagonal check to be so destructive. |
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Kibitzing
sac: 38.Rxg7+
