Chess PatternsGreek gift with h-pawn support
A version of the Greek gift where the knight on g5 can be taken, but a pawn on h4 guards it. Taking the knight opens the h-file, and the rook on h1 joins the attack without moving.
How it works (spoiler)
Black’s bishop on e7 can take the knight on g5, which would normally refute the sacrifice. Here the h-pawn takes back: hxg5 opens the h-file, so the queen on h5 is backed up by the rook on h1, and Qh8 is mate.
Why the knight may now be taken
The second condition of the Greek gift says the knight on g5 must not be capturable. With a pawn on h4 and the rook still on h1 there is an exception: if Black takes the knight, hxg5 opens the h-file for the rook, and the attack gets stronger, not weaker.
The third condition still applies: Black must not be able to bring a defender to h7.
2...Bxg5 3.hxg5+: the capture comes with check on the open h-file
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