| Sep-02-22 | | Brenin: With Black's light squared weaknesses, especially f7, so obvious, 28 Rxf7 is hard to resist. Since 29 Qxh7 mate is threatened, 28 ... Rxf7 is forced (28 ... Kxf7 29 Qxh7+ is disastrous), and then White has 29 Be6 with Rf1 to follow. Unpinning the R with 29 ... Kg7 allows 30 Bxf7, and if 30 ... Kxf7 then 31 Qxh7+ and annihilation. Already White has won a P, and the attack continues. |
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| Sep-02-22 | | mel gibson: I went with 28. Nd6 and I didn't even consider the text line of 28. Rxf7. Stockfish 15 says:
28. Nd6
(28. Nd6 (♘b5-d6 f7-f5 ♘d6xf5 g6xf5 ♗g4xf5 h7-h6
♕h3-g3 ♕d8-e8 h2-h4 ♕e8-h5 h4xg5 h6xg5 ♗f5-g4 ♕h5-h4 ♕g3xh4 g5xh4 ♗b2-a3
♖f8xf1+ ♖d1xf1 ♔g8-h8 ♖f1-f4 ♖b8-g8 ♔g1-h2 ♖g8-g7 ♗g4-e6 ♖g7-g6 ♗e6-f5
♖g6-g5 ♖f4xh4+ ♔h8-g7 ♗f5-d3 ♔g7-g8 ♗a3-c1 ♖g5-g7 ♗c1-h6 ♖g7-e7 ♗d3-f5
♘c6xe5 d4xe5 ♖e7xe5 ♗f5-g4 ♖e5-e4 ♔h2-g3 d5-d4 ♗h6-d2 ♔g8-g7 ♔g3-f3 ♖e4-e7
♗g4-f5 ♔g7-f6 ♗f5-h3 ♘b6-d7 ♗h3xd7 ♖e7xd7) +8.16/42 330) score for White +8.16 depth 42.
if I force Stockfish 15 to take the text line the move is still very strong. 28. Rxf7 Rxf7
(28. .. Rxf7 (♖f8xf7 ♗g4-e6 ♕d8-f8 ♖d1-f1
♕f8-h6 ♗e6xf7+ ♔g8-h8 ♕h3-f3 ♕h6-h5 ♕f3xh5 g6xh5 ♗f7xh5 ♘b6-c8 ♖f1-f3
♘c8-e7 ♘b5-d6 ♗g5-d2 ♔g1-f1 ♗d2-a5 ♘d6-e8 ♘e7-g8 g2-g3 ♗a5-d2 ♘e8-d6 ♘g8-e7
a2-a3 ♗d2-h6 ♔f1-e2 ♗h6-g7 ♔e2-d1 b7-b5 ♗h5-e8 b5-b4 a3-a4 ♘c6-a5 h2-h4
♔h8-g8 ♗e8-f7+ ♔g8-h8 ♗f7-e6 h7-h6 ♔d1-c2 ♖b8-f8 ♖f3xf8+ ♗g7xf8 ♗b2-c1
♘a5-c6 ♗c1-e3 ♘c6-d8 ♗e6-d7 ♘d8-c6 h4-h5 ♘c6-a5 ♗d7-e6 ♘a5-c6 g3-g4 ♘c6-d8
♗e6-d7 ♘e7-c6 ♔c2-d3) -7.45/42 605)
score for Black -7.45 depth 42. |
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| Sep-02-22 | | Brenin: <mel gibson: I went with 28. Nd6>: I rejected that line, as I didn't like the look of 28 ... f5, e.g. 29 Nxf5 gxf5 30 Bxf5 Qc7, but I underestimated White's compensation for the sacrificed N, e.g. 31 Ba3 looks very strong. |
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| Sep-02-22 | | jrredfield: I was uncertain about 28. Nd6 vs. 28. Ba3. I couldn't decide so I just figured it would be one or the other. It turns out that both moves are strong. Komodo Dragon (depth 33):
White +7.34: 28.♘d6 f5 29.♘xf5 gxf5 30.♗xf5 ♕e7 31.♖d3 ♔h8 32.♗a3 ♕g7 33.♖g3 ♖f7 34.♗c1 ♗xc1 35.♖xg7 ♖xg7 36.♖xc1 ♘xd4 37.♕h5 ♘xf5 38.♕xf5 ♖e8 39.e6 ♘c8 40.♕xd5 ♘e7 41.♕d7 ♖f8 42.♖c7 ♔g8 43.♕d6 ♖e8 44.♖d7 h6 45.♕f4 a5 White +5.92: 28.♗a3 ♗e7 29.♘d6 f5 30.exf6 ♗xd6 31.♗e6+ ♔h8 32.♕h6 ♗xh2+ 33.♕xh2 ♖xf6 34.♖de1 ♔g7 35.♗d6 ♖a8 36.♗e5 ♘xe5 37.♕xe5 ♕e7 38.♖c1 ♕xe6 39.♖c7+ ♔h6 40.♕h2+ ♔g5 41.♕g3+ ♕g4 42.♕e3+ ♖f4 43.♖e7 ♖af8 44.g3 ♖8f5 45.♖xh7 ♘c8 46.♖xf4 ♖xf4 47.♕xf4+ ♕xf4 |
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| Sep-02-22 | | jrredfield: The text move is close behind at +5.48 for White. |
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| Sep-02-22 | | agb2002: White has the bishop pair for a bishop and a knight. The first idea that comes to mind is 28.Nd6 to increase the pressure on f7: A) 28... Qe7 (to connect the rooks and allow Nd8 if necessary) 29.Nxf7 Rxf7 30.Rxf7 Kxf7 (30... Qxf7 31.Be6 wins decisive material) 31.Qxh7+ Ke8 (31... Kf8 32.Rf1+ Ke8 33.Qg8+ Qf8 34.Qxf8#) 32.Qg8+ Qf8 33.Qxg6+ and 34.Qxg5 wins three pawns. B) 28... f5 29.Nxf5
B.1) 29... gxf5 30.Bxf5
B.1.a) 30... Rf7 31.Be6 wins decisive material.
B.1.b) 30... Qe7 31.Ba3 Qg7 32.Bxf8, with rook and two pawns for both pieces, and the better position looks good for White. B.1.c) 30... Qc7 31.Ba3, with the double threat Bxf8 and Bd6 looks similar to B.1.b (31... Rfd8 32.Be6+ and 33.Rf7 wins). B.2) 29... Rxf5 30.Bxf5 gxf5 31.Rxf5 with a similar conclusion as above. -----
Another option is the direct 28.Rxf7 Rxf7 (28... Kxf7 29.Qxh7+ Ke8 30.Nd6+ wins decisive material) 29.Be6: A) 29... Qe7 30.Ba3, followed by Nd6, looks good for White. B) 29... Qf8 30.Rf1 Nd8 31.Bxf7+ Nxf7 32.e6 looks winning. C) 29... Kg7 30.Bxf7 must be winning (30... Kxf7 31.Qxh7+ Ke6 [31... Ke8 32.Nd6+] 32.Qxg6+ Kd7 33.Qf5+ Ke8 34.Nd6+ wins). -----
I'm not sure. I'd probably look at my opponent's name: if the number of characters is even then I'd play Nd6, otherwise Rxf7. |
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Sep-02-22
 | | scormus: First thought was 28 e6, which looked (and according to SF is) good after .... fxe6 29 Bxe6+ ec. But 28 ... f5 seems to stop things. My choice was 28 Nd6. 28 ... f5 can be met by 29 Bxf5 (... gxf6 30 Bxf5). W has a lot of pressure and B's K-side defence looks rather threadbare in the face of moves like Ba3 and Rd3. But I didn't work it right through after I saw the text reply, and didn't play it out from the there either, so I cannot really claim credit. |
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| Sep-02-22 | | TheaN: I went with the direct <28.Rxf7> and here the dogma comes around, if you can make something forcing it's usually better in practice. Kind of similar to yesterday, where Kh7 won but Nd3 directly limited White's options, here Rxf7 over Nd6/Ba3 limits Black's options. Fair, the other two win too and if you analyze it out it's fine. I don't have much to add to <Brenin> but I'll give my own two cents in the thought process. After <28.Rxf7>, White's immediate threat besides winning Pf7 is Qxh7#. So, Black is kind of forced to take. If Black declines with lets say h5, Be6 is stronger than after Rxf7. <28....Rxf7> main alternative 28....Kxf7 is disastrous after 29.Qxh7+. <Remember this pattern>, the f7-magnet is very strong if the queen's on the h-file. Black only has 29....Ke8, and I picked 30.Nd6+ #10 here, but Qxg6+ #9 is just as fine. <29.Be6>:
click for larger view
This is the puzzle's key position. Black's up a rook, but Rb8 is idle and Rf7 is pinned. Black has ways to reinforce the defense, but it will cost loads. White is threatening both Rf1 and Nd6, so there's not really any defense that works, except breaking the pin. SF comes up with 29....Qf8 30.Rf1 (or Nd6) Qh6 activating some pieces, but Rf7 is still lost. <29....Kg7 30.Bxf7 +-> and from here on out White's sailing, as Kxf7 still runs into Qxh7+ with disaster even though Black's a piece up, so White leveled material at this point and will win the game after. |
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| Sep-02-22 | | aporia: Nice little Monday puzzle at 41, too. So by sub-game perfection, maybe Rxf7 is a better choice just in order to lead to this. |
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| Sep-02-22 | | Refused: 28.Rxf7 screams out to be played.
28...Rxf7 (obvioulsy not Kxh7 29.Qxh7+ +-)
29.Be6 Qf8 30.Rf1 Qh6 (Nd8 31.Bxf7+ Nxf7 32.e6 looks sufficient) 31.Qxh6 Bxh6 32.Rxf7 looks promising to say the least. |
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| Sep-02-22 | | alshatranji: Why not 34.rf7+? |
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Kibitzing
