By difficulty
Tactics from master games
Positions from games where at least one player was a titled player. The tactics are not harder than anybody else's, but the positions they come out of are better: the mistakes are smaller, the punishment is more precise, and there are fewer of the loose pieces that make club games easy to attack.
How to spot it
Expect the answer to be quieter than it would be at club level. A master's position rarely leaves something hanging, so the tactic usually starts by creating the weakness rather than exploiting one, and the first move is often a small improvement that makes the second one work.
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
28.Rh1+ Kg8 29.Rh8+ Kxh8 30.Qh1+ Bh3 31.Qxh3+ Kg8 32.Qh7+ Kf8 33.Qh8#
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2. White to play Play it out →Answer
31.Bd5+ Kf8 32.Rf7+ Ke8 33.Rxg7
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3. White to play Play it out →Answer
25.Rd8+ Kg7 26.Nf5+ Kg6 27.Rg8+ Kh5 28.g4+ Nxg4 29.hxg4#
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4. Black to play Play it out →Answer
18...Rh1+ 19.Ke2 Rxa1
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5. Black to play Play it out →Answer
22...Qxe5 23.cxb6 Qd5 24.Kf1 Qxd3+ 25.Qxd3 Rxd3
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6. White to play Play it out →Answer
32.Qh8+ Ke7 33.Qxg7#
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7. White to play Play it out →Answer
39.Ng5 Rxg5 40.Qxd8+
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8. White to play Play it out →Answer
31.f4 Bxf4 32.Nxf4
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9. White to play Play it out →Answer
47.Ba4 Kc7 48.Be8
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10. White to play Play it out →Answer
29.Qxg7+ Rxg7 30.Rxf8+ Rg8 31.Rxg8#
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11. White to play Play it out →Answer
36.g7+ Kh7 37.g8=Q+ Rxg8 38.Qf7+ Kh8 39.Qh5+ Rxh5 40.Rxh5#
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12. Black to play Play it out →Answer
22...Rxg5 23.fxg5 Nxg4
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.