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Bent Larsen vs Borislav Ivkov
Larsen - Ivkov Candidates Quarterfinal (1965), Bled YUG, rd 1, Jun-27
King's Indian Attack: Yugoslav Variation (A07)  ·  1-0
ANALYSIS [x]

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Kibitzer's Corner
Oct-21-05  Poisonpawns: 1965 Canidates Quarter finalsgm1 This is an amazing game black has a huge advantage by move 34 and looks like simple win.Boris makes an inacurrate move in 34..Ndb5!? He should have killed the Bishop pair while he had the chance.He is up a passed pawn and Mate is the only way white can win.He leaves Larsen with the Bishop pair and he drums up serious counterplay.Now after 40..Qb1!? Black looks to be clearly winning,and Fritz thinks so to,Larsen plays the brilliant 41.f5!! forcing the position open for the Bishop pair.Now 43.Bh6!!+ Kxh6 44.Qh8+ Kg6 45.h4! wins the queen,with the mate threat on h5.This line is an example of the power of the bishops.Larsen seems to have missed it,Now after a few bad moves Larsen loses the iniative and by move 50.Qd8+ white has to fight for a draw.Now here is where Larsen`s disdain of draws comes into play.On move 53.Bh4!? He declines the draw by repetion which is risky in this position,but he may have felt that with the bishops and exposed king he could get a draw anyway if he had to.A critical test of 53.Bh4 is Qc5!54.Bxh5 d3 55.Qe7+ Kh6 56.Bd1 Qe5 57.Qf8+ Kh7 And it seems black is winning.After 54.Qd7 white attacks 2 pawns so black should play Qc5 to protect the f-pawn,but..Boris played 54.Qc6? and after 55.Qxf5 white is winning easy,shell shocked at the turn around of the game Ivkov plays 55..Nfd6? and runs into 56.Bxf6+ exploiting the pin on the queen.The lesson for me in this game is Stop counterplay early as possible!!.black could have taken the bishop pair with 34..Nxd1. Simplifying the position and probably winning easy.I only wished Larsen saw and played 43.Bh6!! that would have been the crow jewel in a game featuring the powers of the bishop pair.
Sep-17-10  keithbc: just been looking at the option of Bh6+. It wins - eventually as Ivkov will need to give up hos queen (Qxf3) to stop mate. Larsen would end up with Q plus 2ps and Ivkov 2 x Kts and 5 pawns. Admittedly an easy win but not a quick win by any means.
Apr-15-14  Poulsen: My guess is, that Larsen actually looked at Bh6 (since he needed to put that bishop somewhere), but only in the context of the follow up moves Qf6+ and Qxf7+. But then he cannot utilize his white bishop fast enough - strangely enough the king is more safe on the h-line than the g-line.

43.Bh6+,Kxh6 44.Qh8+,Kg6 45.Bxh5+,Kg4 46.h4+ also looks promising at first glance, but the black king can escape via f4 and e4 - and there is no clear mating attack.

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