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Bent Larsen vs F Martinez Ibrahim
San Juan (1969), San Juan PUR, rd 9, Oct-??
Nimzo-Larsen Attack: Modern Variation (A01)  ·  1-0
ANALYSIS [x]

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Kibitzer's Corner
Jul-21-11
Premium Chessgames Member
  wwall: This game was annotated by Larsen in Chess Informant 8, game 1.

Larsen gave 4.f4 a !? annotation and remarked 4.d4

Instead of 5.Nh3?1, 5.Qh5+ g6 6.Qf3

If 7...dxe4? Larsen says 8.Bc4, but why not 8.Qh5+ Kd8 9.Be2 or 9.O-O-O

Instead of 9.Bxd4, perhaps 9.d3 first, then 10.Bxd4

Instead of 9...Bd6, perhaps 9...Nh6 10.d3 Bb4+ 11.c3 Qxd4 12.Nxd4 Bxc3+ and 13.Bxd4

Instead of 10...Qe7, if 10...Bb4+ 11.c3 Qxd4 12.Nxd4 Bxc3+ 13.Ke2 Bxd4 14.Kd2 Bxa1 15.Qxa1 and 16.d4 is strong for White

After 10...Qe7, Black threatens 11...Bxf4.

14...Na6?1 [14...a5] - Larsen, but perhaps 14...Nd7 or 14...Bb4 is better

Larsen said 16.Kb1 was better than 16.Nc3

Instead of 17...Qd6, perhaps better is 17...Qb4 18.Rxe8+ Bxe8 19.Bf2 Ng4

Larsen gives 18...Bxe8?? and says 18...Rxe8 19.Bxa7 is unclear, but this looks like it favors White.

Instead of 19...Ng4, perhaps 19...Qd8 or 19...Nc7 or 19...Qb4

After 22.Re1, White threatens 23.Nxf6+, winning the Queen

Instead of 22...Ne5, perhaps 22...Qd7

Instead of 23.Qf2, perhaps 23.Qe3 b6 24,Nd2 is stronger

Instead of 25...Qd7, perhaps 25...c5

Larsen gives 26...Ne6? [26...Nb5 27.g5 Bb4 28.gxf6!]. Perhaps better is 26...Bb4 27.Re3 Be7

Larsen played 29.Rf1, but better may be 29.Re2 or 29.Re3

Instead of 29...fxg5?, perhaps better is 29...f5 30.Qxf5 Qxf5 31.Rxf5 Ng6

Instead of 30...Qd6, perhaps better is 30...Qe7 (preventing Nf7 later) 31.Qf5 Ng6

After 31.Qf5, White threatens 32.Qxh7 mate and 32.Qxe5

Instead of 32...Ne7, if 32...Qe7, then 33.Nxd8 Qxd8 34.Bxc6 and if 34...Bxc6, then 35.Qf7+ Kh8 26.Qxg7 mate

After 33.Nh6+, White wins after 33...Kh8 34.Qf8+ Ng8 35.Qxg8 mate.

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