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One of the lessons on the Chess.com site uses the Yusupov - Spiridonov match, with the following board.

The "correct" move to make here is for the rook to take the knight, which is fine.

What I didn't understand was the explanation of why that is the correct move:

Had he moved his King to h8 White would have played Rd1-a1 after which Black loses his Queen to a discovered check with the Knight on f6.

I can't see anyway that black would lose his queen. The knight moving will put the king in discovered check, but the only way I can see black losing his queen is if white sacrifices a rook.

What am I missing?

One of the lessons on the Chess.com site uses the Yusupov - Spiridonov match, with Black to play after 1.Nf6+:

[fen "5rk1/pb3p1p/1pr5/8/2P1p1N1/qPQ1P3/4B1PP/3R2K1 w - - 0 1"]

1.Nf6+

The "correct" move to make here is for the rook to take the knight, which is fine.

What I didn't understand was the explanation of why that is the correct move:

Had he moved his King to h8 White would have played Rd1-a1 after which Black loses his Queen to a discovered check with the Knight on f6.

I can't see anyway that black would lose his queen. The knight moving will put the king in discovered check, but the only way I can see black losing his queen is if white sacrifices a rook.

What am I missing?

One of the lessons on the Chess.com site uses the Yusupov - Spiridonov match, with the following board.

The "correct" move to make here is for the rook to take the knight, which is fine.

What I didn't understand was the explanation of why that is the correct move:

Had he moved his King to h8 White would have played Rd1-a1 after which Black loses his Queen to a discovered check with the Knight on f6.

I can't see anyway that black would lose his queen. The night moving will put the king in discovered check, but the only way I can see black losing his queen is if white sacrifices a rook.

What am I missing?

One of the lessons on the Chess.com site uses the Yusupov - Spiridonov match, with the following board.

The "correct" move to make here is for the rook to take the knight, which is fine.

What I didn't understand was the explanation of why that is the correct move:

Had he moved his King to h8 White would have played Rd1-a1 after which Black loses his Queen to a discovered check with the Knight on f6.

I can't see anyway that black would lose his queen. The knight moving will put the king in discovered check, but the only way I can see black losing his queen is if white sacrifices a rook.

What am I missing?