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Vassily Ivanchuk vs Sergei Tiviakov
13th Unive Tournament (2009), Hoogeveen NED, rd 5, Oct-23
Scandinavian Defense: Gubinsky-Melts Defense (B01)  ·  1/2-1/2



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Kibitzer's Corner
Oct-23-09  Bdellovibrio: How does black proceed after 44.f5?

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Oct-23-09  Marmot PFL: 44 f5 Kg8 looks OK for black. 44 g5 was better. I think white starts to go wrong with 47 Bxd4 when 47 Bxg7+ looked better - Kg8 48 Bf6 Qf8 49 Bxd4 and the pawn on h6 causes black problems. In the game after this i thought black defended very well.
Oct-23-09  Eyal: Also, he might have been in too much of a hurry to play h6. Since Rxd4 is Black's only real source of counterplay, White can prevent that first by moves like 46.Qh4 or even 46.Rf1 (since 46...Rxd4?? would lose to 47.Bxd4 Rxd4 48.Rxf5) with ideas of Rf4-Rh4, just increasing the pressure. In fact, Black's situation first became almost desperate when he missed a few moves earlier the right moment for playing the exchange sac: 41...Rxd4! 42.Bxd4 Rxd4 (and then, 43.Bxe6 fxe6 44.Qb8+ Ne8 45.Rxe6 is a nice try, but Black can force a perpetual by 45...Rxg4+! 46.fxg4 Qxg4+ etc.).

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