Well, I was able to find the game online, and the next move - f5!, just not the 17 move continuation which leads to white's eventual checkmate of black. However, a more interesting thought is: where did Black go wrong, in this following game, which lead to this?

It's a good puzzle. And, I don't think I can solve it, just now, but I will give it a try (to improve my analytical and logical skills)..... Let's see, a forced line for white, after the move f5? Hmmmm....... I'll have to get back on this. And, I admit, I can't look that deep (ahead)..... but how? What is the theme? Any clues / hints? Because it is obvious that white is ahead (winning), but how does he do it? Hmmmmmmm......

[Event "Budapest-Moscow"]
[Site "Budapest"]
[Date "1949.??.??"]
[Round "4"]
[White "Kotov, Alexander"]
[Black "Gereben, Erno"]
[Result "1-0"]
[ECO "D94"]
[PlyCount "69"]
[EventDate "1949.??.??"]
[EventType "schev"]
[EventRounds "16"]
[EventCountry "HUN"]
[Source "ChessBase"]

1. d4 d5 2. c4 c6 3. Nc3 Nf6 4. e3 g6 5. Nf3 Bg7 6. Bd3 O-O 7. O-O Bg4 8. h3
Be6 9. cxd5 Nxd5 10. Qe2 Nb4 11. Bb1 N8a6 12. e4 Nc7 13. Bf4 Bc8 14. a3 Ne6 15.
Be3 Na6 16. Rd1 Qc7 17. Ba2 Nf4 18. Qd2 Ne6 19. Rac1 Rd8 20. d5 Nf8 21. Ng5 e6
22. d6 Qd7 23. f4 h6 24. Nf3 b6 25. b4 Bb7 26. Ne5 Qe8 27. Qf2 Nd7 28. Nxd7
Qxd7 29. e5 Rdc8 30. Qg3 Kh7 31. h4 h5 32. Ne4 c5 33. Nf6+ Bxf6 34. exf6 Be4
35. f5 1-0

Holy Cow You're Good!!

Dude, I sincerely hope that you are on my side.....

No. No hints on this one Dustin. Other than the obvious, if f5, threatening, Qg5 etc. Black must respond with?

Theme? Overwhelming force.

I can see some "really bad" moves Black can make, like gxf5?? followed by Qg7 checkmate...... but black isn't going to make it that easy for white. Eventhough, Black is on the defensive, and is losing...... I don't see anything which he is forced to play. It is obvious White has a PLAN, which he developed throughout his game, with his "style" of play, and without knowing exactly what that plan is, which was building up in him, I can't see the forced, key word being "Forced", Continuation. Now, If I was Black, I would probably play Qd8 because I need to try to exchange queens when white trys to checkmate me with his and then manuever it to f8. However, I don't see the "forced" continuation after I would follow through with that move. I know that Black could try re-capturing the pawn, but that loses in 3 moves to Qg5, Qh6+, followed by Qg7++. So, he can't do that.

I don't know. What is the 'Forced' Continuation? Teach me.

White forces the win here through a slight edge in "Time". After f5 Qd8. ( To defend the h6 square?) Then fxg, Bxp?....

Or,

1. f5 Qd8 2. Qg5 Qf8 3. fxe6 fxe6
4. Bxe6 ...

And then, I am not sure which move is stronger - Rd8 possibly? (to avoid going down the exchange and to further do something with the position, also with a Pawn Blockade, which was what the Black queen was orginally doing)

Either way, I can see, white is ahead and will win the game, eventually, but a "Forced Checkmate" Really? How does he do it? I would like to see the rest of the solution (with an explaination) please...... I don't like Black's position because his pieces are tied down in defense without any appearent compensation.

I'm Stuck! What is White's PLAN here?!

1. d4 d5 2. c4 c6 3. Nc3 Nf6 4. e3 g6 5. Nf3 Bg7 6. Bd3 O-O 7. O-O Bg4 8. h3 {last book move} Be6 9. cxd5 Nxd5 10. Qe2 Nb4 11. Bb1 N8a6 12. e4 Nc7 13. Bf4 Bc8 14. a3 Ne6 15. Be3 Na6 16. Rd1 Qc7 17. Ba2 Nf4 18. Qd2 Ne6 19. Rac1 Rd8 20. d5 Nf8 21. Ng5 e6 22. d6 Qd7 23. f4 h6 24. Nf3 b6 25. b4 Bb7 26. Ne5 Qe8 27. Qf2 Nd7 28. Nxd7 Qxd7 29. e5 Rdc8 30. Qg3 Kh7 31. h4 h5 32. Ne4 c5 33. Nf6+ Bxf6 34. exf6 Be4 35. f5 Qd8 36. Qg5 Qf8 37. fxe6 fxe6 38. Bxe6 Rd8 39. Rc4 Bf5 40. Bxf5 gxf5 41. Qxf5+ Kg8 42. Qg6+ Kh8 43. Qxh5+ Kg8 44. Rg4+ Qg7 45. Rxg7+ Kf8 46. Qf7# 1-0

I admit...... I was somewhat frustrated, so I went to ask Fritz 11 and Played him, (I entered in all the moves - up to move 39). And, Here is 1 Possible Solution, which he found after move 39 was played.

Well, It's a Brilliant Puzzle! Now, if only, I can learn the theme from it......