Double check puzzles
Two pieces give check at once. Nothing can block or take both, so the king has to move.
That makes double check the most forcing move in chess. It often leads straight to mate when the king has few squares.
8 real puzzles from games on Lichess, easiest first, rated 690 to 2586. The course has 438 double check puzzles in all.
Puzzle 1 · rated 690
Black just played Bxh5. White to move.
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24. Re8#
Puzzle 2 · rated 1144
Black just played Rf8. White to move.
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24. Ng5+ Kh8 25. Qh7#
Puzzle 3 · rated 1466
White just played Bf3. Black to move.
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25... Nh3+ 26. Kh1 Qg1+ 27. Rxg1 Nf2#
Puzzle 4 · rated 1720
Black just played Qxf4. White to move.
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25. Bxh7+ Kh8 26. Qg7#
Puzzle 5 · rated 1965
Black just played Bxf3. White to move.
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19. Ne6+ Kc8 20. Rd8#
Puzzle 6 · rated 2142
White just played Na4. Black to move.
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18... Rf1+ 19. Kxf1 Nxh2#
Puzzle 7 · rated 2327
Black just played Qb6. White to move.
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20. Rf8+ Kh7 21. Bg8+ Kh8 22. Nf7#
Puzzle 8 · rated 2586
Black just played Nb4. White to move.
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28. Qxb7+ Rf7 29. Qxf7+ Kxf7 30. Nxe5+ Kg8 31. Nxg4
Free, no sign-up. Puzzles come in order of difficulty and the ladder adjusts to how you solve.
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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.