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Bent Larsen vs Joel Benjamin
Hastings (1987/88), Hastings ENG, rd 14, Jan-14
King's Indian Defense: Fianchetto Variation. Larsen Defense (E62)  ·  1-0

ANALYSIS [x]

FEN COPIED

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 1 OF 2 ·  Later Kibitzing>
Feb-14-18
Premium Chessgames Member
  Phony Benoni: Sweet.
Feb-14-18  dumbgai: Dang, this was a tough one for me. Didn’t find Qe5.
Feb-14-18
Premium Chessgames Member
  FSR: I saw 45.Qe5!?, but didn't realize the strength of 45.Rxf7! Kxf7 46.Qe5!
Feb-14-18  stacase: For a while I thought White could snag the Black Queen, but Rook x Knight looked better and better.
Feb-14-18
Premium Chessgames Member
  al wazir: Got it.

45. Rxf7 Rxg2+ 46. Rxg2+ Kxf7 47. Qe5 Re4 48. Rg7+ Kf8 49. Qf6+ Ke8 50. Rg8+ Kcd7 51. Rd8+ Kc7 52. Qd6+ Kb7 53. Rb8+ Ka7 54. Qc7+ Ka6 55. Qb6#.

Sacking the exchange one move earlier would have worked just as well.

Feb-14-18  Fish55: <FSR> Same as you.
Feb-14-18  stst: getting late ... kick off this quiet but quick line: 45.Qe5 (eyeing Qb8)
IF (A)..............NxQ, 46.Rd8#
IF (B)...............Kh7
46.RxN+ .... no more defense for Black
Feb-14-18
Premium Chessgames Member
  An Englishman: Good Evening: One might think that Larsen would have been nicer to someone who played the Larsen Defense.
Feb-14-18  stst: yes, CG POD now prefers more direct and forceful attacks, rather than subtle maneurvers. RxN is stronger!
Feb-14-18  NBZ: I had Rxf7 Kxf7 Qh8, which also appears to win fairly comfortably.
Feb-14-18  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  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  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  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  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.
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