Instead, 32. Be2!? creates a problem for Black to solve after 32...Nxe1 33. Bxe1 (diagram below).

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Here (diagram above) Black must find 33...f3! to maintain a winning edge.

<patzer2> Your suggestion 32.Be2 highlights White's problem on the g-file; After 31...Nf3, 32.gxf3 is not possible due to 32...Rg6 and White cannot defend both g1 & g2

White threatens 33.Bxh6.

Major pieces supported by a minor piece is probably the most dangerous combination possible. Here, white allowed black to aim down the kingside with the queen and a rook, whilst the knight supports.

After <31....Rxh3+ 32.gxh3 Qg1# 0-1> black decisively exposed the weaknesses in the position.

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Fritzie thinks that white is comfortably ahead. She has an extra pawn and the bishop pair. Meanwhile black has to be wary of slipping into an endgame where her weak kingside pawns would be a liability.

Black's best chance is to huff and puff and do that back-arching thing that cats do when they want to look bigger. Black has to attack.

Right now, Fritzie is saying it's a white advantage of +1.6.

29. Rbe1 Rh6

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The advantage increases to more than +2. Black's kingside attack should go nowhere (with best play) and white is increasing her control of the e file.

30. Qc1? Rf8

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White blinks first. She is quite rightly afraid of black pushing to f3, so prevents it by pinning the knight against the black queen. But that's a grubby menial task for a queen to do. Better would have been 30. Bd2.

The evaluation falls to +1. White is still winning, but by less than before.

31. Qc2? Nf3!

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White inexplicably sends her queen back to c2. In effect she has wasted two moves jumping from c2 to c1 and then back to c2. This would be fine against any black move ... except the move that black played. White was so afraid of 31...f3 that she probably didn't imagine that black could play the knight to f3 instead.

Right now, Fritzie is saying that there is only one move which doesn't lead to a forced mate for black. Patzer2's 32. Be2 keeps white in the game, although the evaluation falls to -2.3 as black snaffles the Re1 and keeps on attacking the kingside.

Instead white succumbs to one of the several possible mates.

Playing it out move-by-move with Fritz 12, I came up with 30. Bd2! Rf8 (30...Nf3 31. Rxe8+ ) 31. Qd1 (+2.06 @ 20 depth -- diagram below).

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In slow chess, it's odd to change strategies so dramatically. In fast chess it happens all the time. You notice your game is weak, you try an unsound attack, and maybe it punches through.