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Bent Larsen vs Joel Benjamin
Hastings (1987/88), Hastings ENG
King's Indian Defense: Fianchetto Variation. Larsen Defense (E62)  ·  1-0
ANALYSIS [x]

FEN COPIED

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find similar games 2 more Larsen/Joel Benjamin games
sac: 45.Rxf7 PGN: download | view | print Help: general | java-troubleshooting

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 2 OF 2 ·  Later Kibitzing>
Feb-14-18
Premium Chessgames Member
  agb2002: White has a bishop and a pawn for a knight.

White can start an attack the black king with 45.Rxf7 (45.Ra8+ Kh7 46.Rd7 Rxg2+ 47.Kxg2 Qe2+ seems to win for Black) 45... Kxf7 46.Qe5:

A) 46... Re6 47.Rd7+ and mate soon.

B) 46... Rf6 47.Rd7+ Kg8 48.Qxf6 wins.

C) 46... Rxg2+ 47.Rxg2 and the threat Rg7+ is decisive (47... Re4 48.Rg7+ Kf8 49.Qf6+ Ke8 50.Rg8+ Kd7 51.Rd8+ Kc7 52.Qd6+ and mate in three).

D) 46... Rg8 47.Rd7+ and mate next.

E) 46... Qh4 47.Rd7+ and mate in two.

Feb-14-18
Premium Chessgames Member
  patzer2: Count me among the crowd that picked the difficult win with 45. Qe5 +- (+3.89 @ 30 ply, Stockfish 8) for their Wednesday puzzle solution, but wished instead we had seen the stronger game line 45. Rxf7 Kxf7 46. Qe5 +- (+56.51 @ 30 ply, Stockfish 8).

Black's decisive mistake appears to be 35...Qh5 allowing 36. Rd3 +- (+2.12 @ 28 ply, Stockfish 8). Instead, 35...Ng4+ 36. Kg1 Qxe1+ (+0.92 @ 30 ply, Stockfish 8) puts up much more resistance and gives the second player practical drawing chances.

Earlier, instead of releasing the tension with 13...Bxf3 14. Qxh6 ⩲ to = (+0.26 @ 28 ply, Stockfish 8), I prefer maintaining it with 13...Nf6 = (0.06 @ 29 ply, Stockfish 8).

Feb-14-18  mriddle: I considered 45. Rxf7 Kxf7 46. Qe5, but went with 45. Qe5, thinking I saw a quicker path to a win that way. It looks like I missed a couple responses by black that could make things trickier though: 45... Rg7 and 45... Nd6 (with the possibility of following it up with 46. Rxd6 Rxg2+ 47. Kxg2 Qe2+ which I believe leads to a perpetual check)
Feb-14-18  saturn2: I found the game continuation.
Feb-14-18
Premium Chessgames Member
  mike1: If Larsen would have played the exchange sac straight away it would have been a most impressive start of a sequence I have seen for a long time. 41.R1d2 b5, 42.b3 43.Qa1 44.Rxf7 45.Qe5
Would have.. but no, did not Qe5 myself
Feb-14-18
Premium Chessgames Member
  cocker: I looked at the game line but didn't realise how strong it is. 46 Qh8 is just as good.
Feb-14-18
Premium Chessgames Member
  ajk68: I went with the follow up of Qh8. Not quite as smiting as Qe5, but still easily winning.
Feb-14-18
Premium Chessgames Member
  malt: Gone for 45.R:f7 K:f7 46.Qe5 R:g2+
(46...Re6 47.Rd7+ Ke8 48.Q:e6+) 47.R:g2 Re4 48.Rg7+ Kf8 49.Qf6+

Also 46.Qh8

Feb-14-18  mel gibson: Stockfish 8 agrees and says mate in 27.

45. Rxf7

(45. Rxf7 (♖a7xf7 ♔g8xf7 ♕a1-e5 ♖c4-d4 ♕e5xd4 ♕h5-h4 ♕d4-a7+ ♔f7-g8 ♕a7-a8+ ♔g8-h7 ♖d2-d7+ ♖g6-g7 ♖d7xg7+ ♔h7xg7 ♕a8xc6 ♕h4-f2 ♕c6xb5 ♔g7-g6 ♕b5-e8+ ♔g6-f6 ♕e8-e5+ ♔f6-g6 ♕e5-e6+ ♔g6-g7 b4-b5 h6-h5 ♕e6xf5 ♕f2xe3 ♕f5-e5+ ♕e3xe5 f4xe5 ♔g7-f7 b5-b6 ♔f7-e6 b6-b7 ♔e6xe5 b7-b8♕+ ♔e5-e6 a3-a4 h5-h4 a4-a5 ♔e6-e7 ♕b8-f4 ♔e7-d7 a5-a6 ♔d7-e7 a6-a7 ♔e7-e6 a7-a8♕ ♔e6-e7 ♕f4-e5+ ♔e7-f7 ♕a8-e8+) +M27/39 99)

Feb-14-18  Pasker: Missed Qe5. Quite moves are always hard.
Feb-14-18  DrGridlock: <agb2002> writes:

White can start an attack the black king with 45.Rxf7 (45.Ra8+ Kh7 46.Rd7 Rxg2+ 47.Kxg2 Qe2+ seems to win for Black)

In the 45 Ra8+ sideline, after 45 Kh7, 46 Rf8 is an improvement for White. Komodo rates it as +1.8 for White. Enough for the win, but not as clean a kill-shot as the game continuation.

Feb-14-18
Premium Chessgames Member
  Jimfromprovidence: Watch out for the trap after 45 Rxf7 Kxf7 46 Qe5 Rd4.


click for larger view

If 47 Rxd4?, then Rxg2+.


click for larger view

Feb-14-18
Premium Chessgames Member
  benveniste: Anyone else end up at ♖xf7, ♔xf7, ♕h8?
Feb-14-18  dfcx: Like others, I also went with 46.Qh8, which appears to be as good as Qe5.
Feb-14-18
Premium Chessgames Member
  paulalbert: I also went with 46 Qh8, after looking for a few seconds. Be curious to know from someone who has time to analyze or has an engine whether that is also good.
Feb-14-18  et1: I went to Dh8 but am not sure how does this should unfold to get a win. Does anyone has an evaluation on that line ? Thank you.
Feb-14-18  NBZ: The earlier part of the game is rather interesting. In an equal middlegame, Black makes all the running, and White just uses that energy against him.
Feb-14-18  WDenayer: I was also sure that 45.Qh8+ would win, but I couldn't work it out and asked for help (from Hiarcs 6 : -)). It seems that the move completely loses.
Feb-14-18  WDenayer: In fact, Black easily mates after 45.Qh8 +. Big blunder.
Feb-14-18  dumbgai: Qh8+ works if black responds Nxh8?? allowing Rd8 mate. However, Black can play Kxh8 instead and white has no way to mate and has lost his queen for nothing.
Feb-14-18
Premium Chessgames Member
  patzer2: <paulalbert> I requested the chessgames.com engine look at 46. Qh8 with the result at analysis of move 46.? showing it's a clear win for White.
Feb-14-18
Premium Chessgames Member
  morfishine: <Jimfromprovidence> but isn't <47.exd4> or even <47.Qxd4> a simple enough answer to 46...Rd4?

This leaves White up a minor + pawn


click for larger view

Feb-14-18  Joseph Blackcape: <benveniste: Anyone else end up at ♖xf7, ♔xf7, ♕h8?>

Yes! I somehow got into my head that Q to h8 is the key by leaving the black king completely at the mercy of the white queen and rook with his own defenders always that-one-move-too-far-away and worked from there. And looks like it is easy winning too.

Feb-14-18
Premium Chessgames Member
  Jimfromprovidence: <morf> <but isn't <47.exd4> or even <47.Qxd4> a simple enough answer to 46...Rd4?

This leaves White up a minor + pawn>

Of course, I was just pointing out the one bad capturing option of the three.

Feb-14-18
Premium Chessgames Member
  Del ToRo: What if: 44. Ra7-a8+ Nf7-d8 45. Ra8xd8+ Kg8-f7 46. Rd2-d7+ Kf7-e6 47. Qa1-e5++
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