No, I just used the defaults.
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The program lacks an opening book (a comment, not a criticism – thanks to the author). Suppose you have a text file with opening moves indicating how White should play, say
1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4
3…Nf6 4.0-0 Nxe4 5.d4 ! Black diverges on move 3 – Berlin Defense
3…Nf6 3.Nxe5 d6 4.Nf3 Nxe4 5.d4 ! Black diverges on move 3 – Petroff Defense
1…e6 2.d4 d5 3.Nc3 Nf6 4.Bg5 ! Black diverges on move 1 – French Defense
I wonder how a Fortran program would read such an opening book at start-up and then while playing look up whether a position is in its opening book. Probably o3 could explain 
My understanding is that modern chess engines don’t use opening books, or do they?
I think they do, and Grok agrees. The crude way to program an opening book would be to see if a sequence of moves appears in the book and play the next move in the book if it does. A better approach would be position-based and handle transpositions, so that you play the same move after both
1.e4 e6 2.d4 d5
and
1.d4 e6 2.e4 d5
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Another chess engine, at least 12 years old, that works similarly, is
It compiles with gfortran, ifx, and g95.
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This is great, @dmenezes. Also, welcome to the discourse.
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