Alberto David vs Arpan Das (2018)

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Alberto David vs Arpan Das
16th Delhi Open (2018), New Delhi IND, rd 1, Jan-09
Caro-Kann Defense: Two Knights Attack (B10) · 1-0

ANALYSIS [x]

FEN COPIED

explore this opening	find similar games	1 more A David/A Das game
sac: 25.Ng5	PGN: download \| view \| print	Help: general \| java-troubleshooting

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Aug-29-19		mel gibson: Wow - I saw that one straight away. Stockfish 10 says mate in 16: 25. Ng5 (25. Ng5 (♘f3-g5 ♔h8-g8 ♘g5xh7 ♘c5-e4 ♘h7-g5 ♔g8-f8 ♘g5xe6+ ♔f8-e7 ♘e6xc7 ♖d8xd1 ♕h6xg7 ♗a6-c8 ♖h3-h7 ♘e4-g5 ♕g7-f6+ ♔e7-d7 ♘c7-e6 c6-c5 ♖h7xf7+ ♘g5xf7 ♕f6xf7+ ♔d7-c6 ♕f7-c7+ ♔c6-d5 ♕c7-d6+ ♔d5-e4 f2-f3+ ♔e4-e3 ♕d6xd1 ♗c8xe6 ♕d1-c1+) +M16/45 83)

Aug-29-19		Caissas Clown: Dear oh dear! I was in "Monday Mode",so wasted a few minutes trying to make 26.Qxh7 work i/o 26.Nxh7! Once I fixed that,I thought it was fairly simple for a Thursday puzzle.

Aug-29-19		patzer2: I correctly guessed 25. Ng5! Rxd1 26. Nxh7 +- was the solution to today's Thursday puzzle. I was momentarily uncertain as to whether Black could escape after 26...Rxf1+ 27. Kxf1 b4+, but White's attack still looked winning. So I stayed with 25. Ng5! for my final answer. Stockfish 10 confirms 25. Ng5! Rxd1 26. Nxh7 +- is correct, as it's mate-in-six after 26...Rxf1+ 27. Kxf1 b4+ 28. Kg1 Kg8 29. Nf6+ Kf8 30. Qh8+ Ke7 31. Qxg8+ Ke7 32. Qe8#. P.S.: So where did Black go wrong? Apparently 11...Nc4?!, allowing 12. Nd4 ± to +- (+1.40 @ 33 ply, Stockfish 10) with a strong advantage in space and development for White, was a positional error on Black's part. Instead, 11...b5 12. Bf1 Bb7 13. Qd4 c5 ⩲ to = (+0.48 @ 32 ply, Stockfish 10) appears to give Black enough space and active development to keep the fight near level. Earlier in the opening, instead of 5...e6, I prefer 5...Nxc3 as in Black's win in Radjabov vs V S Gujrathi, 2016.

Aug-29-19		malt: Come up with 25.Ng5 R:d1 26.N:h7 R:f1+ 27.K:f1 b4+ 28.Kg1 Kg8 29.Nf6+ Kf8 30.Qh8+ Rg8 (30...Ke7 30.Qe8#) 31.Q:g8+ Ke7 32.Qe8#

Aug-29-19		agb2002: Black threatens Rxd1. White can attack the black king with 25.Ng5: A) 25... Rxd1 26.Nxh7 A.1) 26... b4 27.Nf6+ Rh7 28.Qxh7#. A.2) 26... f5(6) 27.Nf6+ Rh7 28.Qxh7+ Qxh7 29.Rxh7#. A.3) 26... Kg8 27.Nf6+ Kf8 28.Qh8+ and mate in two. A.4) 26... Rxf1+ 27.Kxf1 b4+ 28.Kg1 does not improve anything for Black. B) 25... Rdg8 26.Qxh7+ Rxh7 27.Rxh7#. C) 25... Ra(b,c,e,f)8 26.Nxh7 as in A. D) 25... f5(6) 26.Nxh7 D.1) 26... Rxh7 27.Rxd8+ and mate next. D.2) 26... Kg8 27.Ng5 Kf8 (due to Qh8#) 28.Qh8+ Rg8 (28... Ke7 29.Qxg7+ Ke8 30.Rh8#) 29.Qf6+ Ke8 30.Rxd8+ Qxd8 31.Qf7#. E) 25... Kg8 26.Nxh7 (26.Qxg7+ Kxg7 27.Rxh7+ Kf8 28.Rxd8+ Qxd8 29.Rh8+ Ke7 30.Rxd8 Kxd8 31.Nxf7+ Ke7 32.Nd6 Na4 33.b4 Nxc3 34.bxa5 Nxa2 looks too involved) 26... f5(6) 27.Ng5 transposes to D.2.

Aug-29-19		TheaN: Somehow this was less intuitive for me, probably because with these major piece batteries you <tend> to strike with the queen or a rook first. The point here is that Black has too much space for the major pieces to finish the job: after 25.Ng5 Rxd1 26.Qxh7+? Rxh7 27.Rxh7+ Kg8 -+ the queen goes first and therefore loses. White can swap it to avoid losing Rd1 and end up with a winning position with 25.Rxd8+?! Qxd8 26.Ng5 Qg8 27.b4 +- but this isn't the point, and is not easily won. No, the key is to <breach> the h-file and do so with confidence. <25.Ng5! +-> after 25....Rxd1 26.Nxh7! #6 and Black's waving goodbye after 26....Rxf1+ 27.Kxf1 b4+ 28.Kg1 Kg8 (else Nf6 #2) 29.Nf6+ Kf8 30.Qh8+ Rg8 31.Qxg8+ Ke7 32.Qe8#. Typically, Black has no proper antidote as now Rxd8+ at any point removes a defender and Nxh7 is still coming. The best I can see is to get the knight to e4 to cover f6 but the simple 25....Ne4 26.Rxd8+ Qxd8 27.Nxe4 +- does the job (27.Nxh7 may be better but it's semantics at that point).

Aug-29-19		saturn2: Black threatens Rxd1 followed by b4 but White is faster at the opponent's king with 25. Ng5 Rxd1 26. Nxh7

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