I constructed the middle stack of this puzzle by developing an algorithm in an Excel spreadsheet. First, I created a list of hundreds of 15-letter movie titles in Excel with one letter to each column. Above that list I had a working area to build a hypothetical triple stack. For the sake of brevity here, I entered good candidates for the top two movies in the stack and evaluated the goodness of fit for all the remaining movies as the third in the stack.
The evaluation was to determine whether the 3-letter combinations of each column could produce viable (vertical) entries. For instance, in the solution grid the successive letter triples which cross the middle stack are: ERE, VEN, ITE, LUM, URY, etc. These were assigned numbers from 0 (= worst) to 9 (= best) for their capacity to form numerous words ... ERE = 8, VEN = 7, ITE = 9, LUM = 4, URY = 3, etc. The net score for the word ENEMY AT THE GATES was assigned the lowest of these values, 3. A non-zero net score meant that the stack was worth transferring to graph paper to build a puzzle with.
For constructors interested in more details, I eyeballed numerical values for all 17676 (=26x26x26) 3-letter combinations ... which include the numbers mentioned above. (This wasn't such an insurmountable task since over 90% of them are 0 anyway). I placed these numbers in a 676 x 26 table which could be accessed with the VLOOKUP function in Excel. I configured this function to use the first two letters (ER, VE, IT, LU, UR, etc.) as the Lookup_value and the third letter (E, N, E, M, Y, etc.) as the Col_index_num ... Enough already!
So, that's what I did before I owned a copy of Crossword Compiler software. Today, I could build the same puzzle quite trivially by removing all the 15-letter entries from my word list except for the movie titles!
1 A | 2 T | 3 A | 4 U | 5 S | 6 A | 7 F | 8 S | 9 H | 10 A | 11 N | 12 I | 13 A |
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14 G | O | D | 15 S | P | E | L | L | 16 R | E | C | O | I | L |
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17 A | P | A | S | S | A | G | E | 18 T | O | I | N | D | I | A |
19 N | A | P | E | 20 I | D | O | 21 S | E | E | |||||
22 A | Z | T | 23 M | 24 B | A | 25 E | 26 M | T | 27 P | 28 P | 29 S |
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30 S | A | O | 31 L | A | O | 32 B | O | R | O |
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33 E | 34 V | 35 I | L | U | N | 36 D | E | R | T | 37 H | E | S | U | N |
38 R | E | T | U | R | N | O | F | T | H | E | K | I | N | G |
39 E | N | E | M | Y | A | T | T | H | E | G | A | T | E | S |
40 C | A | R | P | 41 R | D | S | 42 R | E | A | |||||
43 T | E | A | 44 F | D | A | 45 E | S | L | 46 S | 47 H | 48 E |
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49 T | 50 I | E | 51 S | 52 P | A | 53 R | O | A | M |
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54 R | 55 A | I | S | E | 56 T | H | E | T | 57 I | 58 T | A | N | I | C |
59 A | P | O | L | L | O | 60 S | U | R | E | F | I | R | E |
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61 H | O | N | E | S | T | 62 O | P | E | N | 63 A | Y | E |
Answer summary:
2 unique to this puzzle, 1 debuted here and reused later, 1 unique to Modern Era but used previously.
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