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24. axb4 Qd4
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The queen is actually well placed here. Rd1 is not a real threat because the b2 knight is pinned to the a1 rook and will take several moves to extract. This buys Black time in attack.
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25. Rb1 Bxc4
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The only move. The c8 rook now enters the game along an open file, and the knight on c4 is quite strong.
Alternative variation: [Much weaker is] 25... axb4 [ because it allows White to coordinate quickly and keep material, e.g.] 26. Ba4 Re7 27. Rb3 Rb7 [and now] 28. Rd1 Qc5 [ and the c4 pawn is poison with the rooks threatening all manner of pins.]
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26. Nxc4 Rxc4
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The most vigorous recapture, threatening ...Rxc2 and ...Rxb4 while allowing the e8 rook to swing into the game unimpeded. Black has been running the show thus far, but White's position remains basically solid and Black has no obvious advantage beyond activity and a favorable sharpness of play. If he is not careful, White will regroup and play the natural f4 and e5 with devastating effect. Black needs more ideas.
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27. Rd1 Qb2
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Further infiltration! White is simply not coordinated enough to scare her off, and now she controls some very dangerous squares.
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28. Ba4
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Countering with tempo.
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28... Rc1
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The simplest way to hold the pawn. White cannot play 29.bxa5 without some suffering.
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29. Ree1
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Alternative variation: [The point is that] 29. bxa5 Qd2 [is very strong, e.g.] 30. Rxc1 ([ Also] 30. Ree1 Qxe1 31. Rxe1 Rxe1 32. Kh2 Neg4 33. hxg4 Nxg4 34. Kg3 Nxh6 35. Bxe8 Ra1 [leads to a won endgame for Black.]) 30... Qxc1 31. Kh2 Neg4 [ and Black wins the queen.]
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29... Rxd1 30. Rxd1 Rb8 31. f4
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What else? White needs to find some activity, and now he finally threatens the pawn roller on e5 and removes the annoying threat of ...Neg4 .
Alternative variation: [Still impossible is] 31. bxa5 [because] Qa2 [is very strong, e.g.] 32. Bc6 Rb1 [ and again the king doesn't really have an escape square given ...Neg4 ] 33. Rf1 Rxf1 34. Kxf1 Qc4 35. Ke1 Qc1 36. Ke2 Qc2 37. Ke3 [and now] Neg4
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31... Nc4
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Forced, but happily so. The knight is very strong here.
Alternative variation: [Not] 31... Ned7 [since] 32. Bxd7 [wins]
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32. Kh1
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Essentially forced also. The looming ...Ne3 threatens mate on g2, and White has to defend somehow. There is still no time to pick up the a-pawn!
Alternative variation: 32. bxa5 Ne3 [is forced mate]
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32... Ne3 33. Rg1
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The point of Kh1
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33... Qxb4
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Finally Black has realized the long-term goal of the Benoni - the creation of a passed pawn on the queenside. With White's pieces tied up all over the board and the a4 bishop struggling for squares, Black has a very clear path to victory. The queen capture is most accurate, as the longer march down the a-file meshes much better with Black's pieces, and especially the queen who continues to ride the dark squares unopposed.
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34. Bd1 Qd4
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Surprisingly enough, this is a huge move. If Black is careless, White will actually crash through on h7. This move defends h8/g7, a1, and attacks the bishop on d1. The centralized Black queen is a sharp contrast to White's virtually entombed piece.
Alternative variation: [The careless] 34... a4 35. f5 a3 [ (an obvious blunder, as ...Qd4 is still possible)] 36. fxg6 hxg6 37. Ne6 [ is now winning for White!] fxe6 38. Qxg6 Kh8 39. Qxf6 Kh7 40. Qf7 Kh8 41. Qh5 Kg7 42. Qg5 Kh7 43. Qxe3 [and its all over.]
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35. Be2
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Or else ...Nxd1 is decisive.
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35... a4 36. f5 a3 37. fxg6 hxg6
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White resigned here, as the a-pawn is unstoppable and his kingside attack is going nowhere.
Alternative variation: [ Significantly weaker is] 37... fxg6 [as White now has easy play with] 38. Ne6 [ threatening mate on g7 (or f8 if the rook leaves its post)] Qa7 39. Qf4 [ and the game is basically a draw.]
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