Zugzwang puzzles
Your opponent has to move, and every move they have makes their position worse.
It matters most in endgames, where a quiet waiting move can be the winning one. The question is not "what do I threaten" but "what happens when they must move".
8 real puzzles from games on Lichess, easiest first, rated 703 to 2688. The course has 310 zugzwang puzzles in all.
Puzzle 1 · rated 703
White just played Kf4. Black to move.
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70... Kxd6 71. Ke4 Ke6
Puzzle 2 · rated 1091
White just played e4. Black to move.
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52... Kd4 53. e5 Kd5
Puzzle 3 · rated 1431
White just played Ke3. Black to move.
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38... Ke5 39. Kf3 Kf5
Puzzle 4 · rated 1734
White just played b3. Black to move.
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47... c3 48. b4 Kc4
Puzzle 5 · rated 2006
Black just played axb4. White to move.
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34. axb4 h4 35. f4 g4 36. hxg4
Puzzle 6 · rated 2179
White just played Nb6. Black to move.
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45... Bxb6 46. axb6 d5 47. exd5 Kxd5 48. Kc3 Kc6
Puzzle 7 · rated 2371
White just played Kb2. Black to move.
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45... h5 46. Kc3 Kxa3
Puzzle 8 · rated 2688
White just played Kf3. Black to move.
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49... Ke5 50. g4 h4 51. Ke3 g5
Free, no sign-up. Puzzles come in order of difficulty and the ladder adjusts to how you solve.
Puzzles from the Lichess puzzle database (CC0). Every line was replayed move by move by the course's rules engine. Part of Chess Path, a free chess course. Free coach for your Chess.com and Lichess games.