Checkmate patterns
Anastasia's mate
A knight on e7 covers g8 and g6, and a rook comes to the h-file to mate a king on h7 that has nowhere left. The name comes from a novel published in 1803, which is an odd provenance for a mating pattern and is why it stuck.
How to spot it
The trigger is an enemy king on h7 or h2 with a knight of yours able to reach e7 or e2. Everything else is about getting a rook to the h-file with tempo, and the usual way is a queen sacrifice on h7 that drags the king onto the square where the rook mates.
The positions
Easiest first. Every one is from a real game, and the rating under each board is what it costs the players who have tried it on lichess.
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1. White to play Play it out →Answer
23.Rh1+ Bh5 24.Rxh5#
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2. White to play Play it out →Answer
20.Ne7+ Kh8 21.Rxh7+ Kxh7 22.Rh1#
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3. White to play Play it out →Answer
21.Ne7+ Kh8 22.Rxh7+ Kxh7 23.Qh5#
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4. White to play Play it out →Answer
26.Qxh7+ Kxh7 27.Rh4#
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5. White to play Play it out →Answer
20.Qxh7+ Kxh7 21.Rh4#
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6. Black to play Play it out →Answer
32...Ne3+ 33.Kh3 Rh5#
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7. White to play Play it out →Answer
29.Ne7+ Kh7 30.Qh4+ Qh5 31.Qxh5#
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8. White to play Play it out →Answer
20.Qxg5 hxg5 21.Ne7+ Kh7 22.Rh1#
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9. White to play Play it out →Answer
28.Qd8+ Kg7 29.Ne6+ Kh6 30.Qh4#
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10. White to play Play it out →Answer
34.Rf7+ Bg7 35.Rh2#
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11. White to play Play it out →Answer
24.Qf6+ Rg7 25.Rxh7+ Kxh7 26.Qh4#
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12. White to play Play it out →Answer
30.Bxh7+ Nxh7 31.Ne7+ Kh8 32.Qxh7+ Kxh7 33.Rh3+ Qh4 34.Rxh4#
Reading about a pattern is the easy half. Motify finds the positions where you missed one, by running your own lichess and Chess.com games through Stockfish, and puts each of them behind two or three puzzles on the same idea so you meet it having just found it three times. See how Motify works.
Positions from the lichess puzzle database, released under CC0.