Sally Simpson: Hi,
That is one reason why in the pre database days you got a lot of primer books using the same examples to put across a point. The authors were a tad lazy but let's say you wanted to show a Queen check picking up a loose piece for example a Rook on a8 You are not going to flick through 100's of magazines or books in the hope of finding one. You would use one you know exists in another book. Nowadays far easier to fire up a DB. Look for this position.  click for larger viewAdd on the Exclude Board nothing on f5, g6, d5,c6,b7 and off you go. Such a search (I did one a minute ago to test it) brought up this game which is not on here (now submitted). [Event "DDR-ch 14th"]
[Site "Magdeburg"]
[Date "1964.??.??"]
[Round "15"]
[White "Uhlmann, Wolfgang"]
[Black "Baumbach, Friedrich"]
[Result "1-0"]
[ECO "D30"]
1. d4 d5 2. Nf3 e6 3. c4 c5 4. cxd5 exd5 5. g3 Nc6 6. Bg2 c4 7. O-O Bb4 8. Ne5 Nge7 9. e4 dxe4 10. Nxc6 bxc6 11. Nc3 Bxc3 12. bxc3 f5 13. Bg5 O-O 14. f3 h6 15. Bxe7 Qxe7 16. fxe4 fxe4 17. Rxf8+ Qxf8 18. Bxe4 Bd7 19. Qh5 Qf6 20. Rf1 Qe6 21. Re1 Qf6 22. Bd5+ cxd5 23. Qxd5+ Kh7 24. Qe4+ Qg6 25. Qxa8 Bc6 26. Qc8 Bd5 27. Rf1 Be6 28. Qc6 1-0 A wonderful instructive find.
Here White to move.
 click for larger view22. Bd5+ cxd5
Not a blunder, Black knew what he was doing.
23. Qxd5+ Kh7
 click for larger viewAnd if White takes the a8 Rook Black plays Bc6 hitting the Queen and then Qf3. White has to go for the draw with Qb8-Qb1+ -Qb8 Qb1+. Beautiful, however Uhlmann spotted that shot and slipped in 24. Qe4+  click for larger viewNow Black cannot let the a8 Rook drop with check so Black has to play 24...g6 when the coming Bc6 does not gain a tempo as White has Qxa7+ or 24...Qg6 (as played) when after... 24..Qg6 25. Qxa8 Bc6 26.Qc8
 click for larger viewBlack has no Qf3 and as you can see resigned a few moves later. Zwischenzugs , perpetuals, mating patterns, traps, forks, pins... All that from one game, I have a demo coming up in a few days I'll use this. The chances of me finding it from a 1964 bulletin were zilch. Chess Databases! The best thing since......
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