The position below is a great exercise of Kotov's book "Think like a grandmaster.
Black to move, white to win.
White threatens Qh6 which leads to mate or big material gain.
Black has 5 reasonable defenses:
1. Kh8 (14) to defend h7 with the rook
2. f5 (19) to let the queen help in the defense
3. Bxd5 (45) to capture in important attacking piece
4. Rae8 (15) to defend f6 with a rook
5. Rfe8 (29) ditto
The figures between parentheses are the amount of moves of which the main branch exists (usually split in different branches of a higher order).
The idea is to analyse all logical lines until white wins.
I suggest you try it for the first option of black: 24. . . . Kh8 which has only ca 14 moves.
You can write down all the importants lines you find.
[24. . . . Kh8 25. Bc5! Qe6 26. Be7!! Bxd5
(26. . . . Rg8 27. Bxf6+ Rg7 28.Qg5 Rag8 29. Ne7! Qe7 30. Bxg7+ wins the Queen while every other 29th move wins easy)
27. exd5 attacks the Queen and threatens mate at h7]
To analyze all important lines you have to investigate about 125 moves, which will probably take you a few hours. And even then you will probably find that you missed quite a few beautiful combinations. This is really a great exercise! Which brings me to the following inevitable conclusion: there is no difference between calculation and blindfold chess.
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