This position is after 33...g6 in r28e07p87 (1740) - XAJIK20 (1814; now 1868).
Alex has put the question to white's Knight and white has to decide if the check on h6 is worthwhile. Remember: if you go in, you must be able to get out (or do enough damage while in to make it worth your efforts). White does not calculate correctly and he loses accordingly.
White should probably not check but play 34.Nh4 instead, although our own Alex is still quite a bit better. So white decides to be daring and after 34.Nh6+ Kh8 white's knight has nowhere to go, but he is depending upon following up a ...Bxh6 with Bxh6 -- but can his Bishop then get out?
White decides to try to pry open an escape route for his Knight (or Bishop) but he chooses precisely the wrong way to go about it! After 35.g4? Alex replies 35...Bxh6 36.Bxh6 and now Alex has 36...g5! and the Bishop is threatened by the Queen and has no escape. White plays the creative 37.Qf5! and Alex cannot capture the Bishop directly as his Rook would fall, but after 37...Qxf5 38.gxf5 Rd6 and the Bishop is once again without escape. White plays on another three moves before resigning.
Notice that 35.g4? only appears to pry open the pawns. In fact, it cuts off White's critical option of not getting his Bishop out directly, but at least going in after it with his Queen! If White had played say 35.Kh2 instead of g4? and Black exchanged pieces on h6, 35...Bxh6 36.Bxh6 g4, White would have had 37.Qxh5 protecting the suffering Bishop. What 35.g4? does is it blocks this diagonal and destroys White's chances of saving the piece.
In fact, in this scenario White is actually up a pawn (but he is still worse off). Black might immediately play his Q and R against White's f2 pawn with his Rook on the 7th, where he would almost surely pick up at least the pawn on b2. But at least White would have a fighting chance. 35.g4 looked as if it might pry open an escape route, but it actually closed off a supply line instead.
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